* [syzbot] [mm?] INFO: task hung in hugetlb_fault
@ 2024-09-07 6:23 syzbot
2024-10-08 17:36 ` syzbot
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: syzbot @ 2024-09-07 6:23 UTC (permalink / raw)
To: akpm, linux-kernel, linux-mm, muchun.song, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: b831f83e40a2 Merge tag 'bpf-6.11-rc7' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1565b43b980000
kernel config: https://syzkaller.appspot.com/x/.config?x=660f6eb11f9c7dc5
dashboard link: https://syzkaller.appspot.com/bug?extid=7bb5e48f6ead66c72906
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c788afb419c2/disk-b831f83e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0692a9bfb15e/vmlinux-b831f83e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e22aeda7a3e2/bzImage-b831f83e.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7bb5e48f6ead66c72906@syzkaller.appspotmail.com
INFO: task syz.4.402:7932 blocked for more than 143 seconds.
Not tainted 6.11.0-rc6-syzkaller-00183-gb831f83e40a2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.402 state:D stack:25792 pid:7932 tgid:7932 ppid:6207 flags:0x00000004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5188 [inline]
__schedule+0x1800/0x4a60 kernel/sched/core.c:6529
__schedule_loop kernel/sched/core.c:6606 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6621
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
hugetlb_fault+0x56f/0x3770 mm/hugetlb.c:6451
handle_mm_fault+0x1901/0x1bc0 mm/memory.c:5830
do_user_addr_fault arch/x86/mm/fault.c:1338 [inline]
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x459/0x8c0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f82a094497c
RSP: 002b:00007f82a0c5fb88 EFLAGS: 00010246
RAX: 0000000020000d00 RBX: 0000000000000004 RCX: 8000000000000010
RDX: 0000000000000010 RSI: 00007f82a04005d5 RDI: 0000000020000d00
RBP: 00007f82a0b37a80 R08: 00007f82a0800000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000009 R12: 0000000000038ce8
R13: 00007f82a0c5fc90 R14: 0000000000000032 R15: fffffffffffffffe
</TASK>
INFO: task syz.4.402:7933 blocked for more than 143 seconds.
Not tainted 6.11.0-rc6-syzkaller-00183-gb831f83e40a2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.402 state:D stack:24696 pid:7933 tgid:7932 ppid:6207 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5188 [inline]
__schedule+0x1800/0x4a60 kernel/sched/core.c:6529
__schedule_loop kernel/sched/core.c:6606 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6621
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
hugetlb_wp+0x104d/0x3a90 mm/hugetlb.c:6027
hugetlb_fault+0x27b2/0x3770 mm/hugetlb.c:6579
handle_mm_fault+0x1901/0x1bc0 mm/memory.c:5830
do_user_addr_fault arch/x86/mm/fault.c:1389 [inline]
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:71
Code: 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb c9 <f3> a4 c3 cc cc cc cc 48 89 c8 48 c1 e9 03 83 e0 07 f3 48 a5 89 c1
RSP: 0018:ffffc90004127ad0 EFLAGS: 00050246
RAX: ffffffff84b29101 RBX: 0000000020008640 RCX: 0000000000000040
RDX: 0000000000000000 RSI: ffffc90004127b60 RDI: 0000000020008600
RBP: ffffc90004127c10 R08: ffffc90004127b9f R09: 1ffff92000824f73
R10: dffffc0000000000 R11: fffff52000824f74 R12: 0000000000000040
R13: 0000000000007fc0 R14: 0000000020008600 R15: ffffc90004127b60
copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline]
raw_copy_to_user arch/x86/include/asm/uaccess_64.h:131 [inline]
_inline_copy_to_user include/linux/uaccess.h:181 [inline]
_copy_to_user+0x86/0xb0 lib/usercopy.c:26
copy_to_user include/linux/uaccess.h:209 [inline]
rng_dev_read+0x3be/0x6d0 drivers/char/hw_random/core.c:251
do_loop_readv_writev fs/read_write.c:761 [inline]
vfs_readv+0x6c2/0xa90 fs/read_write.c:934
do_preadv fs/read_write.c:1049 [inline]
__do_sys_preadv fs/read_write.c:1099 [inline]
__se_sys_preadv fs/read_write.c:1094 [inline]
__x64_sys_preadv+0x1c7/0x2d0 fs/read_write.c:1094
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f82a097cef9
RSP: 002b:00007f82a174d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007f82a0b35f80 RCX: 00007f82a097cef9
RDX: 0000000000000002 RSI: 0000000020000580 RDI: 0000000000000005
RBP: 00007f82a09ef01e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f82a0b35f80 R15: 00007f82a0c5fa28
</TASK>
INFO: task syz.4.402:7934 blocked for more than 144 seconds.
Not tainted 6.11.0-rc6-syzkaller-00183-gb831f83e40a2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.402 state:D stack:23288 pid:7934 tgid:7932 ppid:6207 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5188 [inline]
__schedule+0x1800/0x4a60 kernel/sched/core.c:6529
__schedule_loop kernel/sched/core.c:6606 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6621
io_schedule+0x8d/0x110 kernel/sched/core.c:7401
folio_wait_bit_common+0x882/0x12b0 mm/filemap.c:1307
__filemap_get_folio+0xb7/0xc10 mm/filemap.c:1898
hugetlb_fault+0x1b72/0x3770 mm/hugetlb.c:6531
handle_mm_fault+0x1901/0x1bc0 mm/memory.c:5830
do_user_addr_fault arch/x86/mm/fault.c:1389 [inline]
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:__put_user_8+0x11/0x20 arch/x86/lib/putuser.S:107
Code: 84 00 00 00 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 89 cb 48 c1 fb 3f 48 09 d9 0f 01 cb <48> 89 01 31 c9 0f 01 ca c3 cc cc cc cc 66 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000383f778 EFLAGS: 00050202
RAX: 0000000000800000 RBX: 0000000000000000 RCX: 0000000020000020
RDX: 0000000000000000 RSI: ffffffff8c0ae6e0 RDI: ffffffff8c608d80
RBP: ffffc9000383fec8 R08: ffffffff901870ef R09: 1ffffffff2030e1d
R10: dffffc0000000000 R11: fffffbfff2030e1e R12: 1ffff92000707f7d
R13: 1ffff92000707f08 R14: 0000000020800000 R15: 0000000000800000
userfaultfd_copy fs/userfaultfd.c:1735 [inline]
userfaultfd_ioctl+0x28e7/0x70a0 fs/userfaultfd.c:2133
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f82a097cef9
RSP: 002b:00007f82a172c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f82a0b36058 RCX: 00007f82a097cef9
RDX: 0000000020000000 RSI: 00000000c028aa03 RDI: 0000000000000009
RBP: 00007f82a09ef01e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f82a0b36058 R15: 00007f82a0c5fa28
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
#0: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6626
1 lock held by dhcpcd/4900:
#0: ffffffff8fc8be48 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x2ce/0x1bc0 net/ipv4/devinet.c:1101
2 locks held by getty/4982:
#0: ffff8880308270a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ac/0x1e00 drivers/tty/n_tty.c:2211
5 locks held by kworker/u8:12/7252:
#0: ffff88801bae5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
#0: ffff88801bae5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
#1: ffffc90009267d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
#1: ffffc90009267d00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
#2: ffffffff8fc7f290 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:594
#3: ffffffff8fc8be48 (rtnl_mutex){+.+.}-{3:3}, at: default_device_exit_batch+0xe9/0xa90 net/core/dev.c:11883
#4: ffffffff8e93d6f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:328 [inline]
#4: ffffffff8e93d6f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:958
3 locks held by kworker/u8:13/7257:
#0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
#0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
#1: ffffc90004ee7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
#1: ffffc90004ee7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
#2: ffffffff8fc8be48 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276
2 locks held by syz.4.402/7932:
#0: ffff88807be333d0 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:694 [inline]
#0: ffff88807be333d0 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x2f9/0x6e0 mm/memory.c:5998
#1: ffff8880206e6218 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x56f/0x3770 mm/hugetlb.c:6451
2 locks held by syz.4.402/7933:
#0: ffff8880352aa798 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153
#1: ffff8880206e6218 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_wp+0x104d/0x3a90 mm/hugetlb.c:6027
3 locks held by syz.4.402/7934:
#0: ffff8880352aa798 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153
#1: ffff8880206e6218 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x56f/0x3770 mm/hugetlb.c:6451
#2: ffff8880250d48e8 (&resv_map->rw_sema){++++}-{3:3}, at: hugetlb_fault+0x675/0x3770 mm/hugetlb.c:6458
2 locks held by syz.2.812/9374:
#0: ffff888024984c40 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:694 [inline]
#0: ffff888024984c40 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x2f9/0x6e0 mm/memory.c:5998
#1: ffff8880206e6218 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x56f/0x3770 mm/hugetlb.c:6451
1 lock held by syz-executor/10950:
#0: ffffffff8fc8be48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
#0: ffffffff8fc8be48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6644
1 lock held by syz.3.1233/10991:
#0: ffffffff8fc8be48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
#0: ffffffff8fc8be48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6644
3 locks held by syz.3.1233/10996:
#0: ffffffff8fcf15b0 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
#1: ffff888062b59678 (nlk_cb_mutex-GENERIC){+.+.}-{3:3}, at: __netlink_dump_start+0x119/0x790 net/netlink/af_netlink.c:2404
#2: ffffffff8fc8be48 (rtnl_mutex){+.+.}-{3:3}, at: ethnl_default_dump_one net/ethtool/netlink.c:494 [inline]
#2: ffffffff8fc8be48 (rtnl_mutex){+.+.}-{3:3}, at: ethnl_default_dumpit+0x411/0xb30 net/ethtool/netlink.c:529
2 locks held by syz.2.1230/11003:
#0: ffffffff8fcf15b0 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
#1: ffffffff8fc8be48 (rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0x5f/0x8b0 net/wireless/nl80211.c:16547
4 locks held by syz.1.1238/11010:
#0: ffff88802f9a0d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close net/bluetooth/hci_core.c:481 [inline]
#0: ffff88802f9a0d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_unregister_dev+0x203/0x510 net/bluetooth/hci_core.c:2698
#1: ffff88802f9a0078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x572/0x11a0 net/bluetooth/hci_sync.c:5183
#2: ffffffff8fdf7968 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1972 [inline]
#2: ffffffff8fdf7968 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xa6/0x240 net/bluetooth/hci_conn.c:2592
#3: ffffffff8e93d6f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:328 [inline]
#3: ffffffff8e93d6f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:958
1 lock held by syz.4.1239/11013:
#0: ffffffff8fc8be48 (rtnl_mutex){+.+.}-{3:3}, at: __tun_chr_ioctl+0x48f/0x2400 drivers/net/tun.c:3120
1 lock held by syz.4.1239/11014:
#0: ffffffff8fc8be48 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
#0: ffffffff8fc8be48 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3e/0x1b0 drivers/net/tun.c:3510
1 lock held by syz.4.1239/11015:
#0: ffffffff8fc8be48 (rtnl_mutex){+.+.}-{3:3}, at: dev_ioctl+0x706/0x1340 net/core/dev_ioctl.c:783
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc6-syzkaller-00183-gb831f83e40a2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
watchdog+0xff4/0x1040 kernel/hung_task.c:379
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 7259 Comm: kworker/u8:14 Not tainted 6.11.0-rc6-syzkaller-00183-gb831f83e40a2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: 0x0 (bat_events)
RIP: 0010:process_scheduled_works+0x1fd/0x1830 kernel/workqueue.c:3309
Code: e8 18 6f 9c 00 4c 8b 35 41 8d 02 0d 48 8b 5c 24 48 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 f6 6e 9c 00 48 8b 1b <48> 83 c3 50 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8
RSP: 0018:ffffc900098c7bc0 EFLAGS: 00000046
RAX: 1ffff11005d68dcb RBX: ffff88801aca0000 RCX: ffff88806550bc00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900098c7dc0 R08: ffffffff815e648d R09: 1ffff110291e65b1
R10: dffffc0000000000 R11: ffffed10291e65b2 R12: dffffc0000000000
R13: ffff888064648660 R14: 0000000100001f4d R15: ffff888064648668
FS: 0000000000000000(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9e9a1f9000 CR3: 000000000e734000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>
worker_thread+0x86d/0xd10 kernel/workqueue.c:3389
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
---
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [syzbot] [mm?] INFO: task hung in hugetlb_fault
2024-09-07 6:23 [syzbot] [mm?] INFO: task hung in hugetlb_fault syzbot
@ 2024-10-08 17:36 ` syzbot
2024-10-12 10:49 ` Muchun Song
2024-10-10 21:54 ` syzbot
2025-09-04 3:36 ` syzbot
2 siblings, 1 reply; 6+ messages in thread
From: syzbot @ 2024-10-08 17:36 UTC (permalink / raw)
To: akpm, dvyukov, elver, glider, kasan-dev, linux-kernel, linux-mm,
muchun.song, syzkaller-bugs
syzbot has found a reproducer for the following issue on:
HEAD commit: 87d6aab2389e Merge tag 'for_linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17e11780580000
kernel config: https://syzkaller.appspot.com/x/.config?x=fb6ea01107fa96bd
dashboard link: https://syzkaller.appspot.com/bug?extid=7bb5e48f6ead66c72906
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17dd6327980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16d24f9f980000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/676a1b91b952/disk-87d6aab2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f47965c6cebd/vmlinux-87d6aab2.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9ada52fd0e29/bzImage-87d6aab2.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7bb5e48f6ead66c72906@syzkaller.appspotmail.com
INFO: task syz-executor390:6168 blocked for more than 143 seconds.
Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor390 state:D stack:28288 pid:6168 tgid:6166 ppid:5217 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5315 [inline]
__schedule+0xef5/0x5750 kernel/sched/core.c:6675
__schedule_loop kernel/sched/core.c:6752 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6767
io_schedule+0xbf/0x130 kernel/sched/core.c:7552
folio_wait_bit_common+0x3d8/0x9b0 mm/filemap.c:1309
__folio_lock mm/filemap.c:1647 [inline]
folio_lock include/linux/pagemap.h:1148 [inline]
folio_lock include/linux/pagemap.h:1144 [inline]
__filemap_get_folio+0x6a4/0xaf0 mm/filemap.c:1900
filemap_lock_folio include/linux/pagemap.h:788 [inline]
filemap_lock_hugetlb_folio include/linux/hugetlb.h:795 [inline]
hugetlb_fault+0x16ff/0x2fa0 mm/hugetlb.c:6406
handle_mm_fault+0x930/0xaa0 mm/memory.c:6060
do_user_addr_fault+0x7a3/0x13f0 arch/x86/mm/fault.c:1389
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:58
Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb
RSP: 0018:ffffc90009107c48 EFLAGS: 00050246
RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000008
RDX: fffff52001220f98 RSI: ffffc90009107cb8 RDI: 000000002001bd48
RBP: 000000002001bd48 R08: 0000000000000000 R09: fffff52001220f97
R10: ffffc90009107cbf R11: 0000000000000000 R12: ffffc90009107cb8
R13: 000000002001bd50 R14: 0000000000000000 R15: 0000000020019680
copy_user_generic arch/x86/include/asm/uaccess_64.h:121 [inline]
raw_copy_to_user arch/x86/include/asm/uaccess_64.h:142 [inline]
_inline_copy_to_user include/linux/uaccess.h:188 [inline]
_copy_to_user+0xac/0xc0 lib/usercopy.c:26
copy_to_user include/linux/uaccess.h:216 [inline]
msr_read+0x14f/0x250 arch/x86/kernel/msr.c:69
vfs_read+0x1ce/0xbd0 fs/read_write.c:567
ksys_read+0x12f/0x260 fs/read_write.c:712
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4df1b1f8b9
RSP: 002b:00007f4df1ad6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f4df1ba6348 RCX: 00007f4df1b1f8b9
RDX: 0000000000018ff8 RSI: 0000000020019680 RDI: 0000000000000003
RBP: 00007f4df1ba6340 R08: 00007f4df1ad66c0 R09: 00007f4df1ba6348
R10: 00007f4df1ad66c0 R11: 0000000000000246 R12: 00007f4df1ba634c
R13: 0000000000000000 R14: 00007fff98b1c2f0 R15: 00007fff98b1c3d8
</TASK>
INFO: task syz-executor390:6172 blocked for more than 143 seconds.
Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor390 state:D stack:27104 pid:6172 tgid:6166 ppid:5217 flags:0x00000006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5315 [inline]
__schedule+0xef5/0x5750 kernel/sched/core.c:6675
__schedule_loop kernel/sched/core.c:6752 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6767
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
hugetlb_wp+0x1b4a/0x3320 mm/hugetlb.c:5894
hugetlb_fault+0x2248/0x2fa0 mm/hugetlb.c:6454
handle_mm_fault+0x930/0xaa0 mm/memory.c:6060
do_user_addr_fault+0x60d/0x13f0 arch/x86/mm/fault.c:1338
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f4df1ae75cb
RSP: 002b:00007f4df1ab5170 EFLAGS: 00010246
RAX: 006b6e696c766564 RBX: 00007f4df1ba6358 RCX: 00007f4df1b1f8b9
RDX: d8e7cd4472269fec RSI: 0000000000000000 RDI: 00007f4df1ab55a0
RBP: 00007f4df1ba6350 R08: 00007f4df1ab56c0 R09: 00007f4df1ab56c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4df1ba635c
R13: 000000000000006e R14: 00007fff98b1c2f0 R15: 00007fff98b1c3d8
</TASK>
INFO: task syz-executor390:6171 blocked for more than 143 seconds.
Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor390 state:D stack:28288 pid:6171 tgid:6167 ppid:5213 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5315 [inline]
__schedule+0xef5/0x5750 kernel/sched/core.c:6675
__schedule_loop kernel/sched/core.c:6752 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6767
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326
handle_mm_fault+0x930/0xaa0 mm/memory.c:6060
do_user_addr_fault+0x7a3/0x13f0 arch/x86/mm/fault.c:1389
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:58
Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb
RSP: 0018:ffffc90009117c48 EFLAGS: 00050246
RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000008
RDX: fffff52001222f98 RSI: ffffc90009117cb8 RDI: 000000002001b8a0
RBP: 000000002001b8a0 R08: 0000000000000000 R09: fffff52001222f97
R10: ffffc90009117cbf R11: 0000000000000000 R12: ffffc90009117cb8
R13: 000000002001b8a8 R14: 0000000000000000 R15: 0000000020019680
copy_user_generic arch/x86/include/asm/uaccess_64.h:121 [inline]
raw_copy_to_user arch/x86/include/asm/uaccess_64.h:142 [inline]
_inline_copy_to_user include/linux/uaccess.h:188 [inline]
_copy_to_user+0xac/0xc0 lib/usercopy.c:26
copy_to_user include/linux/uaccess.h:216 [inline]
msr_read+0x14f/0x250 arch/x86/kernel/msr.c:69
vfs_read+0x1ce/0xbd0 fs/read_write.c:567
ksys_read+0x12f/0x260 fs/read_write.c:712
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4df1b1f8b9
RSP: 002b:00007f4df1ad6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f4df1ba6348 RCX: 00007f4df1b1f8b9
RDX: 0000000000018ff8 RSI: 0000000020019680 RDI: 0000000000000003
RBP: 00007f4df1ba6340 R08: 00007f4df1ad66c0 R09: 00007f4df1ba6348
R10: 00007f4df1ad66c0 R11: 0000000000000246 R12: 00007f4df1ba634c
R13: 0000000000000000 R14: 00007fff98b1c2f0 R15: 00007fff98b1c3d8
</TASK>
INFO: task syz-executor390:6174 blocked for more than 144 seconds.
Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor390 state:D stack:27104 pid:6174 tgid:6167 ppid:5213 flags:0x00000006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5315 [inline]
__schedule+0xef5/0x5750 kernel/sched/core.c:6675
__schedule_loop kernel/sched/core.c:6752 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6767
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326
handle_mm_fault+0x930/0xaa0 mm/memory.c:6060
do_user_addr_fault+0x60d/0x13f0 arch/x86/mm/fault.c:1338
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f4df1ae75cb
RSP: 002b:00007f4df1ab5170 EFLAGS: 00010246
RAX: 006b6e696c766564 RBX: 00007f4df1ba6358 RCX: 00007f4df1b1f8b9
RDX: d8e7cd4472269fec RSI: 0000000000000000 RDI: 00007f4df1ab55a0
RBP: 00007f4df1ba6350 R08: 00007f4df1ba6358 R09: 00007f4df1ab56c0
R10: 00007f4df1ab56c0 R11: 0000000000000246 R12: 00007f4df1ba635c
R13: 000000000000006e R14: 00007fff98b1c2f0 R15: 00007fff98b1c3d8
</TASK>
INFO: task syz-executor390:6384 blocked for more than 144 seconds.
Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor390 state:D stack:27040 pid:6384 tgid:6383 ppid:5218 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5315 [inline]
__schedule+0xef5/0x5750 kernel/sched/core.c:6675
__schedule_loop kernel/sched/core.c:6752 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6767
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326
handle_mm_fault+0x930/0xaa0 mm/memory.c:6060
do_user_addr_fault+0x7a3/0x13f0 arch/x86/mm/fault.c:1389
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:58
Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb
RSP: 0018:ffffc90009597c48 EFLAGS: 00050246
RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000008
RDX: fffff520012b2f98 RSI: ffffc90009597cb8 RDI: 000000002001d000
RBP: 000000002001d000 R08: 0000000000000000 R09: fffff520012b2f97
R10: ffffc90009597cbf R11: 0000000000000000 R12: ffffc90009597cb8
R13: 000000002001d008 R14: 0000000000000000 R15: 0000000020019680
copy_user_generic arch/x86/include/asm/uaccess_64.h:121 [inline]
raw_copy_to_user arch/x86/include/asm/uaccess_64.h:142 [inline]
_inline_copy_to_user include/linux/uaccess.h:188 [inline]
_copy_to_user+0xac/0xc0 lib/usercopy.c:26
copy_to_user include/linux/uaccess.h:216 [inline]
msr_read+0x14f/0x250 arch/x86/kernel/msr.c:69
vfs_read+0x1ce/0xbd0 fs/read_write.c:567
ksys_read+0x12f/0x260 fs/read_write.c:712
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4df1b1f8b9
RSP: 002b:00007f4df1ad6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f4df1ba6348 RCX: 00007f4df1b1f8b9
RDX: 0000000000018ff8 RSI: 0000000020019680 RDI: 0000000000000003
RBP: 00007f4df1ba6340 R08: 00007f4df1ad66c0 R09: 00007f4df1ba6348
R10: 00007f4df1ba6348 R11: 0000000000000246 R12: 00007f4df1ba634c
R13: 0000000000000000 R14: 00007fff98b1c2f0 R15: 00007fff98b1c3d8
</TASK>
INFO: task syz-executor390:6385 blocked for more than 144 seconds.
Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor390 state:D stack:27088 pid:6385 tgid:6383 ppid:5218 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5315 [inline]
__schedule+0xef5/0x5750 kernel/sched/core.c:6675
__schedule_loop kernel/sched/core.c:6752 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6767
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
hugetlbfs_fallocate+0x577/0xfc0 fs/hugetlbfs/inode.c:872
vfs_fallocate+0x459/0xf90 fs/open.c:333
ksys_fallocate fs/open.c:356 [inline]
__do_sys_fallocate fs/open.c:364 [inline]
__se_sys_fallocate fs/open.c:362 [inline]
__x64_sys_fallocate+0xd9/0x150 fs/open.c:362
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4df1b1f8b9
RSP: 002b:00007f4df1ab5168 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f4df1ba6358 RCX: 00007f4df1b1f8b9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f4df1ba6350 R08: 00007f4df1ab56c0 R09: 00007f4df1ba6358
R10: 0000000000000400 R11: 0000000000000246 R12: 00007f4df1ba635c
R13: 000000000000006e R14: 00007fff98b1c2f0 R15: 00007fff98b1c3d8
</TASK>
INFO: task syz-executor390:6457 blocked for more than 145 seconds.
Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor390 state:D stack:27408 pid:6457 tgid:6453 ppid:5216 flags:0x00000006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5315 [inline]
__schedule+0xef5/0x5750 kernel/sched/core.c:6675
__schedule_loop kernel/sched/core.c:6752 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6767
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
hugetlbfs_fallocate+0x577/0xfc0 fs/hugetlbfs/inode.c:872
vfs_fallocate+0x459/0xf90 fs/open.c:333
ksys_fallocate fs/open.c:356 [inline]
__do_sys_fallocate fs/open.c:364 [inline]
__se_sys_fallocate fs/open.c:362 [inline]
__x64_sys_fallocate+0xd9/0x150 fs/open.c:362
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4df1b1f8b9
RSP: 002b:00007f4df1ab5168 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f4df1ba6358 RCX: 00007f4df1b1f8b9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f4df1ba6350 R08: 00007f4df1ab56c0 R09: 00007f4df1ba6358
R10: 0000000000000400 R11: 0000000000000246 R12: 00007f4df1ba635c
R13: 000000000000006e R14: 00007fff98b1c2f0 R15: 00007fff98b1c3d8
</TASK>
INFO: task syz-executor390:6501 blocked for more than 145 seconds.
Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor390 state:D stack:27616 pid:6501 tgid:6500 ppid:5215 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5315 [inline]
__schedule+0xef5/0x5750 kernel/sched/core.c:6675
__schedule_loop kernel/sched/core.c:6752 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6767
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326
handle_mm_fault+0x930/0xaa0 mm/memory.c:6060
do_user_addr_fault+0x7a3/0x13f0 arch/x86/mm/fault.c:1389
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:58
Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb
RSP: 0018:ffffc90009567c48 EFLAGS: 00050246
RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000008
RDX: fffff520012acf98 RSI: ffffc90009567cb8 RDI: 000000002001e260
RBP: 000000002001e260 R08: 0000000000000000 R09: fffff520012acf97
R10: ffffc90009567cbf R11: 0000000000000000 R12: ffffc90009567cb8
R13: 000000002001e268 R14: 0000000000000000 R15: 0000000020019680
copy_user_generic arch/x86/include/asm/uaccess_64.h:121 [inline]
raw_copy_to_user arch/x86/include/asm/uaccess_64.h:142 [inline]
_inline_copy_to_user include/linux/uaccess.h:188 [inline]
_copy_to_user+0xac/0xc0 lib/usercopy.c:26
copy_to_user include/linux/uaccess.h:216 [inline]
msr_read+0x14f/0x250 arch/x86/kernel/msr.c:69
vfs_read+0x1ce/0xbd0 fs/read_write.c:567
ksys_read+0x12f/0x260 fs/read_write.c:712
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4df1b1f8b9
RSP: 002b:00007f4df1ad6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f4df1ba6348 RCX: 00007f4df1b1f8b9
RDX: 0000000000018ff8 RSI: 0000000020019680 RDI: 0000000000000003
RBP: 00007f4df1ba6340 R08: 00007f4df1ad66c0 R09: 00007f4df1ba6348
R10: 00007f4df1ad66c0 R11: 0000000000000246 R12: 00007f4df1ba634c
R13: 0000000000000000 R14: 00007fff98b1c2f0 R15: 00007fff98b1c3d8
</TASK>
INFO: task syz-executor390:6502 blocked for more than 145 seconds.
Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor390 state:D stack:27184 pid:6502 tgid:6500 ppid:5215 flags:0x00000006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5315 [inline]
__schedule+0xef5/0x5750 kernel/sched/core.c:6675
__schedule_loop kernel/sched/core.c:6752 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6767
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
hugetlbfs_fallocate+0x577/0xfc0 fs/hugetlbfs/inode.c:872
vfs_fallocate+0x459/0xf90 fs/open.c:333
ksys_fallocate fs/open.c:356 [inline]
__do_sys_fallocate fs/open.c:364 [inline]
__se_sys_fallocate fs/open.c:362 [inline]
__x64_sys_fallocate+0xd9/0x150 fs/open.c:362
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4df1b1f8b9
RSP: 002b:00007f4df1ab5168 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f4df1ba6358 RCX: 00007f4df1b1f8b9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f4df1ba6350 R08: 00007f4df1ab56c0 R09: 00007f4df1ba6358
R10: 0000000000000400 R11: 0000000000000246 R12: 00007f4df1ba635c
R13: 000000000000006e R14: 00007fff98b1c2f0 R15: 00007fff98b1c3d8
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6720
5 locks held by kworker/u8:8/3033:
1 lock held by klogd/4663:
2 locks held by getty/4978:
#0: ffff88814c4320a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211
3 locks held by syz-executor390/6168:
#0: ffff8880614a9498 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable include/linux/mmap_lock.h:153 [inline]
#0: ffff8880614a9498 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6108 [inline]
#0: ffff8880614a9498 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x3a9/0x6a0 mm/memory.c:6159
#1: ffff8881442d0728 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326
#2: ffff88806034b8e8 (&resv_map->rw_sema){++++}-{3:3}, at: hugetlb_vma_lock_read mm/hugetlb.c:276 [inline]
#2: ffff88806034b8e8 (&resv_map->rw_sema){++++}-{3:3}, at: hugetlb_vma_lock_read+0x105/0x140 mm/hugetlb.c:267
2 locks held by syz-executor390/6172:
#0: ffff8880247719b8 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:704 [inline]
#0: ffff8880247719b8 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x13e/0x980 mm/memory.c:6228
#1: ffff8881442d0728 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_wp+0x1b4a/0x3320 mm/hugetlb.c:5894
2 locks held by syz-executor390/6171:
#0: ffff8880614a9e18 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:163 [inline]
#0: ffff8880614a9e18 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6099 [inline]
#0: ffff8880614a9e18 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x35/0x6a0 mm/memory.c:6159
#1: ffff8881442d0728 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326
2 locks held by syz-executor390/6174:
#0: ffff88801d6e7070 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:704 [inline]
#0: ffff88801d6e7070 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x13e/0x980 mm/memory.c:6228
#1: ffff8881442d0728 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326
2 locks held by syz-executor390/6384:
#0: ffff8880612e3a98 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable include/linux/mmap_lock.h:153 [inline]
#0: ffff8880612e3a98 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6108 [inline]
#0: ffff8880612e3a98 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x3a9/0x6a0 mm/memory.c:6159
#1: ffff8881442d0728 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326
3 locks held by syz-executor390/6385:
#0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: ksys_fallocate fs/open.c:356 [inline]
#0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: __do_sys_fallocate fs/open.c:364 [inline]
#0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: __se_sys_fallocate fs/open.c:362 [inline]
#0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: __x64_sys_fallocate+0xd9/0x150 fs/open.c:362
#1: ffff88806270b8f8 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline]
#1: ffff88806270b8f8 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: hugetlbfs_fallocate+0x2b6/0xfc0 fs/hugetlbfs/inode.c:828
#2: ffff8881442d0728 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlbfs_fallocate+0x577/0xfc0 fs/hugetlbfs/inode.c:872
3 locks held by syz-executor390/6457:
#0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: ksys_fallocate fs/open.c:356 [inline]
#0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: __do_sys_fallocate fs/open.c:364 [inline]
#0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: __se_sys_fallocate fs/open.c:362 [inline]
#0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: __x64_sys_fallocate+0xd9/0x150 fs/open.c:362
#1: ffff888060fa4148 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline]
#1: ffff888060fa4148 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: hugetlbfs_fallocate+0x2b6/0xfc0 fs/hugetlbfs/inode.c:828
#2: ffff8881442d0728 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlbfs_fallocate+0x577/0xfc0 fs/hugetlbfs/inode.c:872
2 locks held by syz-executor390/6501:
#0: ffff88807d5a4d98 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable include/linux/mmap_lock.h:153 [inline]
#0: ffff88807d5a4d98 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6108 [inline]
#0: ffff88807d5a4d98 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x3a9/0x6a0 mm/memory.c:6159
#1: ffff8881442d0728 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326
3 locks held by syz-executor390/6502:
#0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: ksys_fallocate fs/open.c:356 [inline]
#0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: __do_sys_fallocate fs/open.c:364 [inline]
#0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: __se_sys_fallocate fs/open.c:362 [inline]
#0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: __x64_sys_fallocate+0xd9/0x150 fs/open.c:362
#1: ffff8880611b69c8 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline]
#1: ffff8880611b69c8 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: hugetlbfs_fallocate+0x2b6/0xfc0 fs/hugetlbfs/inode.c:828
#2: ffff8881442d0728 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlbfs_fallocate+0x577/0xfc0 fs/hugetlbfs/inode.c:872
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
watchdog+0xf0c/0x1240 kernel/hung_task.c:379
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 3033 Comm: kworker/u8:8 Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:lockdep_recursion_finish kernel/locking/lockdep.c:467 [inline]
RIP: 0010:lock_acquire.part.0+0x126/0x380 kernel/locking/lockdep.c:5827
Code: 94 c1 6a 00 45 0f b6 c9 ff b4 24 f8 00 00 00 41 57 44 8b 44 24 2c 8b 4c 24 28 e8 a5 ad ff ff 48 c7 c7 40 d3 6c 8b 48 83 c4 28 <e8> 25 23 b7 09 b8 ff ff ff ff 65 0f c1 05 40 d7 97 7e 83 f8 01 0f
RSP: 0018:ffffc90009a577a8 EFLAGS: 00000082
RAX: 0000000000000001 RBX: 1ffff9200134aef6 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffff8b6cd340
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff2dc4d88
R10: ffffffff96e26c47 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88801b07b078 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a312fe8fd8 CR3: 000000000df7c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
__pte_offset_map_lock+0xf1/0x300 mm/pgtable-generic.c:375
pte_offset_map_lock include/linux/mm.h:3014 [inline]
__get_locked_pte+0x79/0xc0 mm/memory.c:1992
get_locked_pte include/linux/mm.h:2727 [inline]
__text_poke+0x224/0xca0 arch/x86/kernel/alternative.c:1899
text_poke_bp_batch+0x493/0x760 arch/x86/kernel/alternative.c:2373
text_poke_flush arch/x86/kernel/alternative.c:2486 [inline]
text_poke_flush arch/x86/kernel/alternative.c:2483 [inline]
text_poke_finish+0x30/0x40 arch/x86/kernel/alternative.c:2493
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
jump_label_update+0x1d7/0x400 kernel/jump_label.c:920
static_key_enable_cpuslocked+0x1b7/0x270 kernel/jump_label.c:210
static_key_enable+0x1a/0x20 kernel/jump_label.c:223
toggle_allocation_gate mm/kfence/core.c:849 [inline]
toggle_allocation_gate+0xfc/0x260 mm/kfence/core.c:841
process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
process_scheduled_works kernel/workqueue.c:3310 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.676 msecs
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [syzbot] [mm?] INFO: task hung in hugetlb_fault
2024-09-07 6:23 [syzbot] [mm?] INFO: task hung in hugetlb_fault syzbot
2024-10-08 17:36 ` syzbot
@ 2024-10-10 21:54 ` syzbot
2024-10-11 9:54 ` Vlastimil Babka
2025-09-04 3:36 ` syzbot
2 siblings, 1 reply; 6+ messages in thread
From: syzbot @ 2024-10-10 21:54 UTC (permalink / raw)
To: akpm, dvyukov, elver, glider, kasan-dev, keescook, linux-kernel,
linux-mm, mcgrof, mhiramat, mhocko, mike.kravetz, muchun.song,
syzkaller-bugs, torvalds, vbabka
syzbot has bisected this issue to:
commit 3db978d480e2843979a2b56f2f7da726f2b295b2
Author: Vlastimil Babka <vbabka@suse.cz>
Date: Mon Jun 8 04:40:24 2020 +0000
kernel/sysctl: support setting sysctl parameters from kernel command line
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1499efd0580000
start commit: 87d6aab2389e Merge tag 'for_linus' of git://git.kernel.org..
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=1699efd0580000
console output: https://syzkaller.appspot.com/x/log.txt?x=1299efd0580000
kernel config: https://syzkaller.appspot.com/x/.config?x=fb6ea01107fa96bd
dashboard link: https://syzkaller.appspot.com/bug?extid=7bb5e48f6ead66c72906
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17dd6327980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16d24f9f980000
Reported-by: syzbot+7bb5e48f6ead66c72906@syzkaller.appspotmail.com
Fixes: 3db978d480e2 ("kernel/sysctl: support setting sysctl parameters from kernel command line")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [syzbot] [mm?] INFO: task hung in hugetlb_fault
2024-10-10 21:54 ` syzbot
@ 2024-10-11 9:54 ` Vlastimil Babka
0 siblings, 0 replies; 6+ messages in thread
From: Vlastimil Babka @ 2024-10-11 9:54 UTC (permalink / raw)
To: syzbot, akpm, dvyukov, elver, glider, kasan-dev, keescook,
linux-kernel, linux-mm, mcgrof, mhiramat, mhocko, mike.kravetz,
muchun.song, syzkaller-bugs, torvalds
On 10/10/24 11:54 PM, syzbot wrote:
> syzbot has bisected this issue to:
>
> commit 3db978d480e2843979a2b56f2f7da726f2b295b2
> Author: Vlastimil Babka <vbabka@suse.cz>
> Date: Mon Jun 8 04:40:24 2020 +0000
>
> kernel/sysctl: support setting sysctl parameters from kernel command line
Hi, I see you have a number of sysctl options in CONFIG_CMDLINE
including sysctl.vm.nr_hugepages=4 which seems necessary to get a
hugetlb_fault. And without the commit above, those sysctl boot options
are not applied. So you'd have to handle sysctl differently to test any
commits earlier than that one.
Thanks,
Vlastimil
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1499efd0580000
> start commit: 87d6aab2389e Merge tag 'for_linus' of git://git.kernel.org..
> git tree: upstream
> final oops: https://syzkaller.appspot.com/x/report.txt?x=1699efd0580000
> console output: https://syzkaller.appspot.com/x/log.txt?x=1299efd0580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=fb6ea01107fa96bd
> dashboard link: https://syzkaller.appspot.com/bug?extid=7bb5e48f6ead66c72906
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17dd6327980000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16d24f9f980000
>
> Reported-by: syzbot+7bb5e48f6ead66c72906@syzkaller.appspotmail.com
> Fixes: 3db978d480e2 ("kernel/sysctl: support setting sysctl parameters from kernel command line")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [syzbot] [mm?] INFO: task hung in hugetlb_fault
2024-10-08 17:36 ` syzbot
@ 2024-10-12 10:49 ` Muchun Song
0 siblings, 0 replies; 6+ messages in thread
From: Muchun Song @ 2024-10-12 10:49 UTC (permalink / raw)
To: syzbot
Cc: akpm, dvyukov, elver, glider, kasan-dev, linux-kernel, linux-mm,
syzkaller-bugs
> On Oct 9, 2024, at 01:36, syzbot <syzbot+7bb5e48f6ead66c72906@syzkaller.appspotmail.com> wrote:
>
> syzbot has found a reproducer for the following issue on:
>
> HEAD commit: 87d6aab2389e Merge tag 'for_linus' of git://git.kernel.org..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=17e11780580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=fb6ea01107fa96bd
> dashboard link: https://syzkaller.appspot.com/bug?extid=7bb5e48f6ead66c72906
> compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17dd6327980000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16d24f9f980000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/676a1b91b952/disk-87d6aab2.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/f47965c6cebd/vmlinux-87d6aab2.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/9ada52fd0e29/bzImage-87d6aab2.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+7bb5e48f6ead66c72906@syzkaller.appspotmail.com
>
> INFO: task syz-executor390:6168 blocked for more than 143 seconds.
> Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:syz-executor390 state:D stack:28288 pid:6168 tgid:6166 ppid:5217 flags:0x00004006
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:5315 [inline]
> __schedule+0xef5/0x5750 kernel/sched/core.c:6675
> __schedule_loop kernel/sched/core.c:6752 [inline]
> schedule+0xe7/0x350 kernel/sched/core.c:6767
> io_schedule+0xbf/0x130 kernel/sched/core.c:7552
> folio_wait_bit_common+0x3d8/0x9b0 mm/filemap.c:1309
> __folio_lock mm/filemap.c:1647 [inline]
> folio_lock include/linux/pagemap.h:1148 [inline]
> folio_lock include/linux/pagemap.h:1144 [inline]
> __filemap_get_folio+0x6a4/0xaf0 mm/filemap.c:1900
This thread is waiting the page lock while holding hugetlb_fault_mutex_table lock.
The question is who is holding the page lock, but we cannot get the info from
lockdep tool.
> filemap_lock_folio include/linux/pagemap.h:788 [inline]
> filemap_lock_hugetlb_folio include/linux/hugetlb.h:795 [inline]
> hugetlb_fault+0x16ff/0x2fa0 mm/hugetlb.c:6406
> handle_mm_fault+0x930/0xaa0 mm/memory.c:6060
> do_user_addr_fault+0x7a3/0x13f0 arch/x86/mm/fault.c:1389
> handle_page_fault arch/x86/mm/fault.c:1481 [inline]
> exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
> asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
> RIP: 0010:rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:58
> Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb
> RSP: 0018:ffffc90009107c48 EFLAGS: 00050246
> RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000008
> RDX: fffff52001220f98 RSI: ffffc90009107cb8 RDI: 000000002001bd48
> RBP: 000000002001bd48 R08: 0000000000000000 R09: fffff52001220f97
> R10: ffffc90009107cbf R11: 0000000000000000 R12: ffffc90009107cb8
> R13: 000000002001bd50 R14: 0000000000000000 R15: 0000000020019680
> copy_user_generic arch/x86/include/asm/uaccess_64.h:121 [inline]
> raw_copy_to_user arch/x86/include/asm/uaccess_64.h:142 [inline]
> _inline_copy_to_user include/linux/uaccess.h:188 [inline]
> _copy_to_user+0xac/0xc0 lib/usercopy.c:26
> copy_to_user include/linux/uaccess.h:216 [inline]
> msr_read+0x14f/0x250 arch/x86/kernel/msr.c:69
> vfs_read+0x1ce/0xbd0 fs/read_write.c:567
> ksys_read+0x12f/0x260 fs/read_write.c:712
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f4df1b1f8b9
> RSP: 002b:00007f4df1ad6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
> RAX: ffffffffffffffda RBX: 00007f4df1ba6348 RCX: 00007f4df1b1f8b9
> RDX: 0000000000018ff8 RSI: 0000000020019680 RDI: 0000000000000003
> RBP: 00007f4df1ba6340 R08: 00007f4df1ad66c0 R09: 00007f4df1ba6348
> R10: 00007f4df1ad66c0 R11: 0000000000000246 R12: 00007f4df1ba634c
> R13: 0000000000000000 R14: 00007fff98b1c2f0 R15: 00007fff98b1c3d8
> </TASK>
> INFO: task syz-executor390:6172 blocked for more than 143 seconds.
> Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:syz-executor390 state:D stack:27104 pid:6172 tgid:6166 ppid:5217 flags:0x00000006
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:5315 [inline]
> __schedule+0xef5/0x5750 kernel/sched/core.c:6675
> __schedule_loop kernel/sched/core.c:6752 [inline]
> schedule+0xe7/0x350 kernel/sched/core.c:6767
> schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824
> __mutex_lock_common kernel/locking/mutex.c:684 [inline]
> __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
I think this thread is waiting the above hugetlb_fault_mutex_table lock.
> hugetlb_wp+0x1b4a/0x3320 mm/hugetlb.c:5894
> hugetlb_fault+0x2248/0x2fa0 mm/hugetlb.c:6454
> handle_mm_fault+0x930/0xaa0 mm/memory.c:6060
> do_user_addr_fault+0x60d/0x13f0 arch/x86/mm/fault.c:1338
> handle_page_fault arch/x86/mm/fault.c:1481 [inline]
> exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
> asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
> RIP: 0033:0x7f4df1ae75cb
> RSP: 002b:00007f4df1ab5170 EFLAGS: 00010246
> RAX: 006b6e696c766564 RBX: 00007f4df1ba6358 RCX: 00007f4df1b1f8b9
> RDX: d8e7cd4472269fec RSI: 0000000000000000 RDI: 00007f4df1ab55a0
> RBP: 00007f4df1ba6350 R08: 00007f4df1ab56c0 R09: 00007f4df1ab56c0
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4df1ba635c
> R13: 000000000000006e R14: 00007fff98b1c2f0 R15: 00007fff98b1c3d8
> </TASK>
> INFO: task syz-executor390:6171 blocked for more than 143 seconds.
> Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:syz-executor390 state:D stack:28288 pid:6171 tgid:6167 ppid:5213 flags:0x00004006
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:5315 [inline]
> __schedule+0xef5/0x5750 kernel/sched/core.c:6675
> __schedule_loop kernel/sched/core.c:6752 [inline]
> schedule+0xe7/0x350 kernel/sched/core.c:6767
> schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824
> __mutex_lock_common kernel/locking/mutex.c:684 [inline]
> __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
Same.
> hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326
> handle_mm_fault+0x930/0xaa0 mm/memory.c:6060
> do_user_addr_fault+0x7a3/0x13f0 arch/x86/mm/fault.c:1389
> handle_page_fault arch/x86/mm/fault.c:1481 [inline]
> exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
> asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
> RIP: 0010:rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:58
> Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb
> RSP: 0018:ffffc90009117c48 EFLAGS: 00050246
> RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000008
> RDX: fffff52001222f98 RSI: ffffc90009117cb8 RDI: 000000002001b8a0
> RBP: 000000002001b8a0 R08: 0000000000000000 R09: fffff52001222f97
> R10: ffffc90009117cbf R11: 0000000000000000 R12: ffffc90009117cb8
> R13: 000000002001b8a8 R14: 0000000000000000 R15: 0000000020019680
> copy_user_generic arch/x86/include/asm/uaccess_64.h:121 [inline]
> raw_copy_to_user arch/x86/include/asm/uaccess_64.h:142 [inline]
> _inline_copy_to_user include/linux/uaccess.h:188 [inline]
> _copy_to_user+0xac/0xc0 lib/usercopy.c:26
> copy_to_user include/linux/uaccess.h:216 [inline]
> msr_read+0x14f/0x250 arch/x86/kernel/msr.c:69
> vfs_read+0x1ce/0xbd0 fs/read_write.c:567
> ksys_read+0x12f/0x260 fs/read_write.c:712
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f4df1b1f8b9
> RSP: 002b:00007f4df1ad6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
> RAX: ffffffffffffffda RBX: 00007f4df1ba6348 RCX: 00007f4df1b1f8b9
> RDX: 0000000000018ff8 RSI: 0000000020019680 RDI: 0000000000000003
> RBP: 00007f4df1ba6340 R08: 00007f4df1ad66c0 R09: 00007f4df1ba6348
> R10: 00007f4df1ad66c0 R11: 0000000000000246 R12: 00007f4df1ba634c
> R13: 0000000000000000 R14: 00007fff98b1c2f0 R15: 00007fff98b1c3d8
> </TASK>
> INFO: task syz-executor390:6174 blocked for more than 144 seconds.
> Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:syz-executor390 state:D stack:27104 pid:6174 tgid:6167 ppid:5213 flags:0x00000006
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:5315 [inline]
> __schedule+0xef5/0x5750 kernel/sched/core.c:6675
> __schedule_loop kernel/sched/core.c:6752 [inline]
> schedule+0xe7/0x350 kernel/sched/core.c:6767
> schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824
> __mutex_lock_common kernel/locking/mutex.c:684 [inline]
> __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
> hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326
> handle_mm_fault+0x930/0xaa0 mm/memory.c:6060
> do_user_addr_fault+0x60d/0x13f0 arch/x86/mm/fault.c:1338
> handle_page_fault arch/x86/mm/fault.c:1481 [inline]
> exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
> asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
> RIP: 0033:0x7f4df1ae75cb
> RSP: 002b:00007f4df1ab5170 EFLAGS: 00010246
> RAX: 006b6e696c766564 RBX: 00007f4df1ba6358 RCX: 00007f4df1b1f8b9
> RDX: d8e7cd4472269fec RSI: 0000000000000000 RDI: 00007f4df1ab55a0
> RBP: 00007f4df1ba6350 R08: 00007f4df1ba6358 R09: 00007f4df1ab56c0
> R10: 00007f4df1ab56c0 R11: 0000000000000246 R12: 00007f4df1ba635c
> R13: 000000000000006e R14: 00007fff98b1c2f0 R15: 00007fff98b1c3d8
> </TASK>
> INFO: task syz-executor390:6384 blocked for more than 144 seconds.
> Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:syz-executor390 state:D stack:27040 pid:6384 tgid:6383 ppid:5218 flags:0x00004006
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:5315 [inline]
> __schedule+0xef5/0x5750 kernel/sched/core.c:6675
> __schedule_loop kernel/sched/core.c:6752 [inline]
> schedule+0xe7/0x350 kernel/sched/core.c:6767
> schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824
> __mutex_lock_common kernel/locking/mutex.c:684 [inline]
> __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
> hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326
> handle_mm_fault+0x930/0xaa0 mm/memory.c:6060
> do_user_addr_fault+0x7a3/0x13f0 arch/x86/mm/fault.c:1389
> handle_page_fault arch/x86/mm/fault.c:1481 [inline]
> exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
> asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
> RIP: 0010:rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:58
> Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb
> RSP: 0018:ffffc90009597c48 EFLAGS: 00050246
> RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000008
> RDX: fffff520012b2f98 RSI: ffffc90009597cb8 RDI: 000000002001d000
> RBP: 000000002001d000 R08: 0000000000000000 R09: fffff520012b2f97
> R10: ffffc90009597cbf R11: 0000000000000000 R12: ffffc90009597cb8
> R13: 000000002001d008 R14: 0000000000000000 R15: 0000000020019680
> copy_user_generic arch/x86/include/asm/uaccess_64.h:121 [inline]
> raw_copy_to_user arch/x86/include/asm/uaccess_64.h:142 [inline]
> _inline_copy_to_user include/linux/uaccess.h:188 [inline]
> _copy_to_user+0xac/0xc0 lib/usercopy.c:26
> copy_to_user include/linux/uaccess.h:216 [inline]
> msr_read+0x14f/0x250 arch/x86/kernel/msr.c:69
> vfs_read+0x1ce/0xbd0 fs/read_write.c:567
> ksys_read+0x12f/0x260 fs/read_write.c:712
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f4df1b1f8b9
> RSP: 002b:00007f4df1ad6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
> RAX: ffffffffffffffda RBX: 00007f4df1ba6348 RCX: 00007f4df1b1f8b9
> RDX: 0000000000018ff8 RSI: 0000000020019680 RDI: 0000000000000003
> RBP: 00007f4df1ba6340 R08: 00007f4df1ad66c0 R09: 00007f4df1ba6348
> R10: 00007f4df1ba6348 R11: 0000000000000246 R12: 00007f4df1ba634c
> R13: 0000000000000000 R14: 00007fff98b1c2f0 R15: 00007fff98b1c3d8
> </TASK>
> INFO: task syz-executor390:6385 blocked for more than 144 seconds.
> Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:syz-executor390 state:D stack:27088 pid:6385 tgid:6383 ppid:5218 flags:0x00004006
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:5315 [inline]
> __schedule+0xef5/0x5750 kernel/sched/core.c:6675
> __schedule_loop kernel/sched/core.c:6752 [inline]
> schedule+0xe7/0x350 kernel/sched/core.c:6767
> schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824
> __mutex_lock_common kernel/locking/mutex.c:684 [inline]
> __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
> hugetlbfs_fallocate+0x577/0xfc0 fs/hugetlbfs/inode.c:872
> vfs_fallocate+0x459/0xf90 fs/open.c:333
> ksys_fallocate fs/open.c:356 [inline]
> __do_sys_fallocate fs/open.c:364 [inline]
> __se_sys_fallocate fs/open.c:362 [inline]
> __x64_sys_fallocate+0xd9/0x150 fs/open.c:362
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f4df1b1f8b9
> RSP: 002b:00007f4df1ab5168 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
> RAX: ffffffffffffffda RBX: 00007f4df1ba6358 RCX: 00007f4df1b1f8b9
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
> RBP: 00007f4df1ba6350 R08: 00007f4df1ab56c0 R09: 00007f4df1ba6358
> R10: 0000000000000400 R11: 0000000000000246 R12: 00007f4df1ba635c
> R13: 000000000000006e R14: 00007fff98b1c2f0 R15: 00007fff98b1c3d8
> </TASK>
> INFO: task syz-executor390:6457 blocked for more than 145 seconds.
> Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:syz-executor390 state:D stack:27408 pid:6457 tgid:6453 ppid:5216 flags:0x00000006
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:5315 [inline]
> __schedule+0xef5/0x5750 kernel/sched/core.c:6675
> __schedule_loop kernel/sched/core.c:6752 [inline]
> schedule+0xe7/0x350 kernel/sched/core.c:6767
> schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824
> __mutex_lock_common kernel/locking/mutex.c:684 [inline]
> __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
> hugetlbfs_fallocate+0x577/0xfc0 fs/hugetlbfs/inode.c:872
> vfs_fallocate+0x459/0xf90 fs/open.c:333
> ksys_fallocate fs/open.c:356 [inline]
> __do_sys_fallocate fs/open.c:364 [inline]
> __se_sys_fallocate fs/open.c:362 [inline]
> __x64_sys_fallocate+0xd9/0x150 fs/open.c:362
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f4df1b1f8b9
> RSP: 002b:00007f4df1ab5168 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
> RAX: ffffffffffffffda RBX: 00007f4df1ba6358 RCX: 00007f4df1b1f8b9
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
> RBP: 00007f4df1ba6350 R08: 00007f4df1ab56c0 R09: 00007f4df1ba6358
> R10: 0000000000000400 R11: 0000000000000246 R12: 00007f4df1ba635c
> R13: 000000000000006e R14: 00007fff98b1c2f0 R15: 00007fff98b1c3d8
> </TASK>
> INFO: task syz-executor390:6501 blocked for more than 145 seconds.
> Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:syz-executor390 state:D stack:27616 pid:6501 tgid:6500 ppid:5215 flags:0x00004006
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:5315 [inline]
> __schedule+0xef5/0x5750 kernel/sched/core.c:6675
> __schedule_loop kernel/sched/core.c:6752 [inline]
> schedule+0xe7/0x350 kernel/sched/core.c:6767
> schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824
> __mutex_lock_common kernel/locking/mutex.c:684 [inline]
> __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
> hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326
> handle_mm_fault+0x930/0xaa0 mm/memory.c:6060
> do_user_addr_fault+0x7a3/0x13f0 arch/x86/mm/fault.c:1389
> handle_page_fault arch/x86/mm/fault.c:1481 [inline]
> exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
> asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
> RIP: 0010:rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:58
> Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb
> RSP: 0018:ffffc90009567c48 EFLAGS: 00050246
> RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000008
> RDX: fffff520012acf98 RSI: ffffc90009567cb8 RDI: 000000002001e260
> RBP: 000000002001e260 R08: 0000000000000000 R09: fffff520012acf97
> R10: ffffc90009567cbf R11: 0000000000000000 R12: ffffc90009567cb8
> R13: 000000002001e268 R14: 0000000000000000 R15: 0000000020019680
> copy_user_generic arch/x86/include/asm/uaccess_64.h:121 [inline]
> raw_copy_to_user arch/x86/include/asm/uaccess_64.h:142 [inline]
> _inline_copy_to_user include/linux/uaccess.h:188 [inline]
> _copy_to_user+0xac/0xc0 lib/usercopy.c:26
> copy_to_user include/linux/uaccess.h:216 [inline]
> msr_read+0x14f/0x250 arch/x86/kernel/msr.c:69
> vfs_read+0x1ce/0xbd0 fs/read_write.c:567
> ksys_read+0x12f/0x260 fs/read_write.c:712
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f4df1b1f8b9
> RSP: 002b:00007f4df1ad6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
> RAX: ffffffffffffffda RBX: 00007f4df1ba6348 RCX: 00007f4df1b1f8b9
> RDX: 0000000000018ff8 RSI: 0000000020019680 RDI: 0000000000000003
> RBP: 00007f4df1ba6340 R08: 00007f4df1ad66c0 R09: 00007f4df1ba6348
> R10: 00007f4df1ad66c0 R11: 0000000000000246 R12: 00007f4df1ba634c
> R13: 0000000000000000 R14: 00007fff98b1c2f0 R15: 00007fff98b1c3d8
> </TASK>
> INFO: task syz-executor390:6502 blocked for more than 145 seconds.
> Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:syz-executor390 state:D stack:27184 pid:6502 tgid:6500 ppid:5215 flags:0x00000006
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:5315 [inline]
> __schedule+0xef5/0x5750 kernel/sched/core.c:6675
> __schedule_loop kernel/sched/core.c:6752 [inline]
> schedule+0xe7/0x350 kernel/sched/core.c:6767
> schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824
> __mutex_lock_common kernel/locking/mutex.c:684 [inline]
> __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
> hugetlbfs_fallocate+0x577/0xfc0 fs/hugetlbfs/inode.c:872
> vfs_fallocate+0x459/0xf90 fs/open.c:333
> ksys_fallocate fs/open.c:356 [inline]
> __do_sys_fallocate fs/open.c:364 [inline]
> __se_sys_fallocate fs/open.c:362 [inline]
> __x64_sys_fallocate+0xd9/0x150 fs/open.c:362
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f4df1b1f8b9
> RSP: 002b:00007f4df1ab5168 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
> RAX: ffffffffffffffda RBX: 00007f4df1ba6358 RCX: 00007f4df1b1f8b9
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
> RBP: 00007f4df1ba6350 R08: 00007f4df1ab56c0 R09: 00007f4df1ba6358
> R10: 0000000000000400 R11: 0000000000000246 R12: 00007f4df1ba635c
> R13: 000000000000006e R14: 00007fff98b1c2f0 R15: 00007fff98b1c3d8
> </TASK>
>
> Showing all locks held in the system:
> 1 lock held by khungtaskd/30:
> #0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
> #0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
> #0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6720
> 5 locks held by kworker/u8:8/3033:
> 1 lock held by klogd/4663:
> 2 locks held by getty/4978:
> #0: ffff88814c4320a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
> #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211
> 3 locks held by syz-executor390/6168:
> #0: ffff8880614a9498 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable include/linux/mmap_lock.h:153 [inline]
> #0: ffff8880614a9498 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6108 [inline]
> #0: ffff8880614a9498 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x3a9/0x6a0 mm/memory.c:6159
> #1: ffff8881442d0728 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326
> #2: ffff88806034b8e8 (&resv_map->rw_sema){++++}-{3:3}, at: hugetlb_vma_lock_read mm/hugetlb.c:276 [inline]
> #2: ffff88806034b8e8 (&resv_map->rw_sema){++++}-{3:3}, at: hugetlb_vma_lock_read+0x105/0x140 mm/hugetlb.c:267
> 2 locks held by syz-executor390/6172:
> #0: ffff8880247719b8 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:704 [inline]
> #0: ffff8880247719b8 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x13e/0x980 mm/memory.c:6228
> #1: ffff8881442d0728 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_wp+0x1b4a/0x3320 mm/hugetlb.c:5894
> 2 locks held by syz-executor390/6171:
> #0: ffff8880614a9e18 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:163 [inline]
> #0: ffff8880614a9e18 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6099 [inline]
> #0: ffff8880614a9e18 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x35/0x6a0 mm/memory.c:6159
> #1: ffff8881442d0728 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326
> 2 locks held by syz-executor390/6174:
> #0: ffff88801d6e7070 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:704 [inline]
> #0: ffff88801d6e7070 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x13e/0x980 mm/memory.c:6228
> #1: ffff8881442d0728 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326
> 2 locks held by syz-executor390/6384:
> #0: ffff8880612e3a98 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable include/linux/mmap_lock.h:153 [inline]
> #0: ffff8880612e3a98 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6108 [inline]
> #0: ffff8880612e3a98 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x3a9/0x6a0 mm/memory.c:6159
> #1: ffff8881442d0728 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326
> 3 locks held by syz-executor390/6385:
> #0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: ksys_fallocate fs/open.c:356 [inline]
> #0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: __do_sys_fallocate fs/open.c:364 [inline]
> #0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: __se_sys_fallocate fs/open.c:362 [inline]
> #0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: __x64_sys_fallocate+0xd9/0x150 fs/open.c:362
> #1: ffff88806270b8f8 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline]
> #1: ffff88806270b8f8 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: hugetlbfs_fallocate+0x2b6/0xfc0 fs/hugetlbfs/inode.c:828
> #2: ffff8881442d0728 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlbfs_fallocate+0x577/0xfc0 fs/hugetlbfs/inode.c:872
> 3 locks held by syz-executor390/6457:
> #0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: ksys_fallocate fs/open.c:356 [inline]
> #0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: __do_sys_fallocate fs/open.c:364 [inline]
> #0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: __se_sys_fallocate fs/open.c:362 [inline]
> #0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: __x64_sys_fallocate+0xd9/0x150 fs/open.c:362
> #1: ffff888060fa4148 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline]
> #1: ffff888060fa4148 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: hugetlbfs_fallocate+0x2b6/0xfc0 fs/hugetlbfs/inode.c:828
> #2: ffff8881442d0728 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlbfs_fallocate+0x577/0xfc0 fs/hugetlbfs/inode.c:872
> 2 locks held by syz-executor390/6501:
> #0: ffff88807d5a4d98 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable include/linux/mmap_lock.h:153 [inline]
> #0: ffff88807d5a4d98 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6108 [inline]
> #0: ffff88807d5a4d98 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x3a9/0x6a0 mm/memory.c:6159
> #1: ffff8881442d0728 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326
> 3 locks held by syz-executor390/6502:
> #0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: ksys_fallocate fs/open.c:356 [inline]
> #0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: __do_sys_fallocate fs/open.c:364 [inline]
> #0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: __se_sys_fallocate fs/open.c:362 [inline]
> #0: ffff8880232a0420 (sb_writers#10){.+.+}-{0:0}, at: __x64_sys_fallocate+0xd9/0x150 fs/open.c:362
> #1: ffff8880611b69c8 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline]
> #1: ffff8880611b69c8 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: hugetlbfs_fallocate+0x2b6/0xfc0 fs/hugetlbfs/inode.c:828
> #2: ffff8881442d0728 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlbfs_fallocate+0x577/0xfc0 fs/hugetlbfs/inode.c:872
>
> =============================================
>
> NMI backtrace for cpu 1
> CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
> Call Trace:
> <TASK>
> __dump_stack lib/dump_stack.c:94 [inline]
> dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
> nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
> nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
> trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
> check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
> watchdog+0xf0c/0x1240 kernel/hung_task.c:379
> kthread+0x2c1/0x3a0 kernel/kthread.c:389
> ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
> </TASK>
> Sending NMI from CPU 1 to CPUs 0:
> NMI backtrace for cpu 0
> CPU: 0 UID: 0 PID: 3033 Comm: kworker/u8:8 Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
> Workqueue: events_unbound toggle_allocation_gate
> RIP: 0010:lockdep_recursion_finish kernel/locking/lockdep.c:467 [inline]
> RIP: 0010:lock_acquire.part.0+0x126/0x380 kernel/locking/lockdep.c:5827
> Code: 94 c1 6a 00 45 0f b6 c9 ff b4 24 f8 00 00 00 41 57 44 8b 44 24 2c 8b 4c 24 28 e8 a5 ad ff ff 48 c7 c7 40 d3 6c 8b 48 83 c4 28 <e8> 25 23 b7 09 b8 ff ff ff ff 65 0f c1 05 40 d7 97 7e 83 f8 01 0f
> RSP: 0018:ffffc90009a577a8 EFLAGS: 00000082
> RAX: 0000000000000001 RBX: 1ffff9200134aef6 RCX: 0000000000000001
> RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffff8b6cd340
> RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff2dc4d88
> R10: ffffffff96e26c47 R11: 0000000000000000 R12: 0000000000000000
> R13: ffff88801b07b078 R14: 0000000000000000 R15: 0000000000000000
> FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000055a312fe8fd8 CR3: 000000000df7c000 CR4: 00000000003526f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> <NMI>
> </NMI>
> <TASK>
> __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
> _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
> spin_lock include/linux/spinlock.h:351 [inline]
> __pte_offset_map_lock+0xf1/0x300 mm/pgtable-generic.c:375
> pte_offset_map_lock include/linux/mm.h:3014 [inline]
> __get_locked_pte+0x79/0xc0 mm/memory.c:1992
> get_locked_pte include/linux/mm.h:2727 [inline]
> __text_poke+0x224/0xca0 arch/x86/kernel/alternative.c:1899
> text_poke_bp_batch+0x493/0x760 arch/x86/kernel/alternative.c:2373
> text_poke_flush arch/x86/kernel/alternative.c:2486 [inline]
> text_poke_flush arch/x86/kernel/alternative.c:2483 [inline]
> text_poke_finish+0x30/0x40 arch/x86/kernel/alternative.c:2493
> arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
> jump_label_update+0x1d7/0x400 kernel/jump_label.c:920
> static_key_enable_cpuslocked+0x1b7/0x270 kernel/jump_label.c:210
> static_key_enable+0x1a/0x20 kernel/jump_label.c:223
> toggle_allocation_gate mm/kfence/core.c:849 [inline]
> toggle_allocation_gate+0xfc/0x260 mm/kfence/core.c:841
> process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
> process_scheduled_works kernel/workqueue.c:3310 [inline]
> worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
> kthread+0x2c1/0x3a0 kernel/kthread.c:389
> ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
> </TASK>
> INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.676 msecs
>
>
> ---
> If you want syzbot to run the reproducer, reply with:
> #syz test: git://repo/address.git branch-or-commit-hash
> If you attach or paste a git patch, syzbot will apply it before testing.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [syzbot] [mm?] INFO: task hung in hugetlb_fault
2024-09-07 6:23 [syzbot] [mm?] INFO: task hung in hugetlb_fault syzbot
2024-10-08 17:36 ` syzbot
2024-10-10 21:54 ` syzbot
@ 2025-09-04 3:36 ` syzbot
2 siblings, 0 replies; 6+ messages in thread
From: syzbot @ 2025-09-04 3:36 UTC (permalink / raw)
To: akpm, david, dvyukov, elver, glider, kasan-dev, keescook,
linux-kernel, linux-mm, mcgrof, mhiramat, mhocko, mike.kravetz,
muchun.song, osalvador, syzkaller-bugs, torvalds, vbabka
syzbot suspects this issue was fixed by commit:
commit 2ae1ab9934c785b855583e3eabd208d6f3ac91e1
Author: Oscar Salvador <osalvador@suse.de>
Date: Mon Jun 30 14:42:08 2025 +0000
mm,hugetlb: change mechanism to detect a COW on private mapping
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1289ea42580000
start commit: 87d6aab2389e Merge tag 'for_linus' of git://git.kernel.org..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=fb6ea01107fa96bd
dashboard link: https://syzkaller.appspot.com/bug?extid=7bb5e48f6ead66c72906
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17dd6327980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16d24f9f980000
If the result looks correct, please mark the issue as fixed by replying with:
#syz fix: mm,hugetlb: change mechanism to detect a COW on private mapping
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2025-09-04 3:36 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2024-09-07 6:23 [syzbot] [mm?] INFO: task hung in hugetlb_fault syzbot
2024-10-08 17:36 ` syzbot
2024-10-12 10:49 ` Muchun Song
2024-10-10 21:54 ` syzbot
2024-10-11 9:54 ` Vlastimil Babka
2025-09-04 3:36 ` syzbot
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