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r+IO0tNeG6o/ZT9dGee61B982wIuucOH5O77V73miIGCxPEy4wr6AQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This looks to be unrelated to my patch and some issue with syzbot (it's doing weird injection stuff). As I said, I have tested the change with reproducer locally and it fixes the issue, and I have been able to reliably observe that (note, without any of the below stuff happening). Thanks On Wed, Jul 16, 2025 at 08:55:03PM -0700, syzbot wrote: > Hello, > > syzbot has tested the proposed patch but the reproducer is still triggering an issue: > INFO: task hung in exit_mm > > INFO: task syz.0.16:6665 blocked for more than 143 seconds. > Not tainted 6.16.0-rc6-next-20250716-syzkaller-ge8352908bdcd-dirty #0 > Blocked by coredump. > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz.0.16 state:D stack:26920 pid:6665 tgid:6665 ppid:6577 task_flags:0x40044c flags:0x00004004 > Call Trace: > > context_switch kernel/sched/core.c:5314 [inline] > __schedule+0x16fd/0x4cf0 kernel/sched/core.c:6697 > __schedule_loop kernel/sched/core.c:6775 [inline] > schedule+0x165/0x360 kernel/sched/core.c:6790 > schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6847 > rwsem_down_read_slowpath+0x5fd/0x8f0 kernel/locking/rwsem.c:1088 > __down_read_common kernel/locking/rwsem.c:1263 [inline] > __down_read kernel/locking/rwsem.c:1276 [inline] > down_read+0x98/0x2e0 kernel/locking/rwsem.c:1541 > mmap_read_lock include/linux/mmap_lock.h:423 [inline] > exit_mm+0xcc/0x2c0 kernel/exit.c:557 > do_exit+0x648/0x2300 kernel/exit.c:947 > do_group_exit+0x21c/0x2d0 kernel/exit.c:1100 > get_signal+0x1286/0x1340 kernel/signal.c:3034 > arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337 > exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:40 > exit_to_user_mode_prepare include/linux/irq-entry-common.h:208 [inline] > syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] > syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] > do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f524bb8e963 > RSP: 002b:00007ffc99164708 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 > RAX: fffffffffffffffc RBX: 00007f524b5ff6c0 RCX: 00007f524bb8e963 > RDX: 0000000000000000 RSI: 0000000000021000 RDI: 0000000000000000 > RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000 > R10: 0000000000020022 R11: 0000000000000246 R12: 00007ffc99164860 > R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000 > > INFO: task syz.1.17:6807 blocked for more than 144 seconds. > Not tainted 6.16.0-rc6-next-20250716-syzkaller-ge8352908bdcd-dirty #0 > Blocked by coredump. > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz.1.17 state:D stack:26920 pid:6807 tgid:6807 ppid:6787 task_flags:0x40044c flags:0x00004004 > Call Trace: > > context_switch kernel/sched/core.c:5314 [inline] > __schedule+0x16fd/0x4cf0 kernel/sched/core.c:6697 > __schedule_loop kernel/sched/core.c:6775 [inline] > schedule+0x165/0x360 kernel/sched/core.c:6790 > schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6847 > rwsem_down_read_slowpath+0x5fd/0x8f0 kernel/locking/rwsem.c:1088 > __down_read_common kernel/locking/rwsem.c:1263 [inline] > __down_read kernel/locking/rwsem.c:1276 [inline] > down_read+0x98/0x2e0 kernel/locking/rwsem.c:1541 > mmap_read_lock include/linux/mmap_lock.h:423 [inline] > exit_mm+0xcc/0x2c0 kernel/exit.c:557 > do_exit+0x648/0x2300 kernel/exit.c:947 > do_group_exit+0x21c/0x2d0 kernel/exit.c:1100 > get_signal+0x1286/0x1340 kernel/signal.c:3034 > arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337 > exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:40 > exit_to_user_mode_prepare include/linux/irq-entry-common.h:208 [inline] > syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] > syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] > do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7efc6b58e963 > RSP: 002b:00007ffe5b639e88 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 > RAX: fffffffffffffffc RBX: 00007efc6afff6c0 RCX: 00007efc6b58e963 > RDX: 0000000000000000 RSI: 0000000000021000 RDI: 0000000000000000 > RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000 > R10: 0000000000020022 R11: 0000000000000246 R12: 00007ffe5b639fe0 > R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000 > > > Showing all locks held in the system: > 1 lock held by khungtaskd/31: > #0: ffffffff8e13e2e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] > #0: ffffffff8e13e2e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] > #0: ffffffff8e13e2e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770 > 3 locks held by kworker/0:3/981: > 3 locks held by kworker/u8:9/3028: > #0: ffff8880b8739f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:606 > #1: ffff8880b8724008 (per_cpu_ptr(&psi_seq, cpu)){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880 kernel/sched/psi.c:937 > #2: ffff8880b8725918 (&base->lock){-.-.}-{2:2}, at: lock_timer_base kernel/time/timer.c:1004 [inline] > #2: ffff8880b8725918 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x1ae/0xf30 kernel/time/timer.c:1085 > 2 locks held by getty/5607: > #0: ffff88814df960a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 > #1: ffffc9000332e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222 > 1 lock held by syz.0.16/6665: > #0: ffff8880242d4260 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:423 [inline] > #0: ffff8880242d4260 (&mm->mmap_lock){++++}-{4:4}, at: exit_mm+0xcc/0x2c0 kernel/exit.c:557 > 1 lock held by syz.0.16/6666: > 1 lock held by syz.1.17/6807: > #0: ffff88807b8c57e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:423 [inline] > #0: ffff88807b8c57e0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mm+0xcc/0x2c0 kernel/exit.c:557 > 1 lock held by syz.1.17/6808: > 1 lock held by syz.2.18/6831: > #0: ffff88807e36c260 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:423 [inline] > #0: ffff88807e36c260 (&mm->mmap_lock){++++}-{4:4}, at: exit_mm+0xcc/0x2c0 kernel/exit.c:557 > 1 lock held by syz.2.18/6832: > 1 lock held by syz.3.19/6858: > #0: ffff88807b8c2ce0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:423 [inline] > #0: ffff88807b8c2ce0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mm+0xcc/0x2c0 kernel/exit.c:557 > 3 locks held by syz.3.19/6859: > 1 lock held by syz.4.20/6888: > #0: ffff88801a476d60 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:423 [inline] > #0: ffff88801a476d60 (&mm->mmap_lock){++++}-{4:4}, at: exit_mm+0xcc/0x2c0 kernel/exit.c:557 > 1 lock held by syz.4.20/6889: > 1 lock held by syz.5.21/6925: > #0: ffff88801a472220 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:423 [inline] > #0: ffff88801a472220 (&mm->mmap_lock){++++}-{4:4}, at: exit_mm+0xcc/0x2c0 kernel/exit.c:557 > 1 lock held by syz.5.21/6926: > 1 lock held by syz.6.22/6955: > #0: ffff88807f93b7a0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:423 [inline] > #0: ffff88807f93b7a0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mm+0xcc/0x2c0 kernel/exit.c:557 > 1 lock held by syz.6.22/6956: > 1 lock held by syz.7.24/6990: > #0: ffff88807c9ec260 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:423 [inline] > #0: ffff88807c9ec260 (&mm->mmap_lock){++++}-{4:4}, at: exit_mm+0xcc/0x2c0 kernel/exit.c:557 > 1 lock held by syz.7.24/6992: > 2 locks held by dhcpcd/6995: > #0: ffff88805e42b808 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] > #0: ffff88805e42b808 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: __sock_release net/socket.c:648 [inline] > #0: ffff88805e42b808 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: sock_close+0x9b/0x240 net/socket.c:1439 > #1: ffffffff8e143e38 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline] > #1: ffffffff8e143e38 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730 kernel/rcu/tree_exp.h:967 > 1 lock held by dhcpcd/6996: > #0: ffff88805e42ca08 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] > #0: ffff88805e42ca08 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: __sock_release net/socket.c:648 [inline] > #0: ffff88805e42ca08 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: sock_close+0x9b/0x240 net/socket.c:1439 > 1 lock held by dhcpcd/6997: > #0: ffff888078933208 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] > #0: ffff888078933208 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: __sock_release net/socket.c:648 [inline] > #0: ffff888078933208 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: sock_close+0x9b/0x240 net/socket.c:1439 > 2 locks held by dhcpcd/6998: > #0: ffff888078930208 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] > #0: ffff888078930208 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: __sock_release net/socket.c:648 [inline] > #0: ffff888078930208 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: sock_close+0x9b/0x240 net/socket.c:1439 > #1: ffffffff8e143e38 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:343 [inline] > #1: ffffffff8e143e38 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730 kernel/rcu/tree_exp.h:967 > > ============================================= > > NMI backtrace for cpu 0 > CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc6-next-20250716-syzkaller-ge8352908bdcd-dirty #0 PREEMPT(full) > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 > Call Trace: > > dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 > nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113 > nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 > trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] > check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline] > watchdog+0xfee/0x1030 kernel/hung_task.c:491 > kthread+0x70e/0x8a0 kernel/kthread.c:463 > ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > Sending NMI from CPU 0 to CPUs 1: > NMI backtrace for cpu 1 > CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted 6.16.0-rc6-next-20250716-syzkaller-ge8352908bdcd-dirty #0 PREEMPT(full) > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 > Workqueue: events_unbound nsim_dev_trap_report_work > RIP: 0010:__this_cpu_preempt_check+0xe/0x20 lib/smp_processor_id.c:64 > Code: 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 89 fe 48 c7 c7 00 65 e3 8b bd fe ff ff cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 > RSP: 0018:ffffc90000a08bc8 EFLAGS: 00000002 > RAX: 0000000000000001 RBX: ffffffff822479bd RCX: da4b2af8b834fd00 > RDX: ffff888029254d90 RSI: ffffffff8d994444 RDI: ffffffff8be36500 > RBP: ffffc90000a08ed0 R08: 00000000c506ef33 R09: 00000000624b5ae2 > R10: 000000000000000e R11: ffffffff81ac3010 R12: 0000000000000000 > R13: ffffffff81a7e844 R14: ffff88801cecda00 R15: 0000000000000286 > FS: 0000000000000000(0000) GS:ffff888125ce2000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000055a7ec2b0660 CR3: 000000005fa88000 CR4: 00000000003526f0 > Call Trace: > > lockdep_hardirqs_off+0x74/0x110 kernel/locking/lockdep.c:4514 > trace_hardirqs_off+0x12/0x40 kernel/trace/trace_preemptirq.c:104 > kasan_quarantine_put+0x3d/0x220 mm/kasan/quarantine.c:207 > kasan_slab_free include/linux/kasan.h:233 [inline] > slab_free_hook mm/slub.c:2417 [inline] > slab_free_after_rcu_debug+0x129/0x2a0 mm/slub.c:4730 > rcu_do_batch kernel/rcu/tree.c:2584 [inline] > rcu_core+0xca5/0x1710 kernel/rcu/tree.c:2840 > handle_softirqs+0x286/0x870 kernel/softirq.c:579 > do_softirq+0xec/0x180 kernel/softirq.c:480 > > > __local_bh_enable_ip+0x17d/0x1c0 kernel/softirq.c:407 > spin_unlock_bh include/linux/spinlock.h:396 [inline] > nsim_dev_trap_report drivers/net/netdevsim/dev.c:833 [inline] > nsim_dev_trap_report_work+0x7c7/0xb80 drivers/net/netdevsim/dev.c:864 > process_one_work kernel/workqueue.c:3239 [inline] > process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3322 > worker_thread+0x8a0/0xda0 kernel/workqueue.c:3403 > kthread+0x70e/0x8a0 kernel/kthread.c:463 > ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > > > Tested on: > > commit: e8352908 Add linux-next specific files for 20250716 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=1523c58c580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=2594af20939db736 > dashboard link: https://syzkaller.appspot.com/bug?extid=ebfd0e44b5c11034e1eb > compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 > patch: https://syzkaller.appspot.com/x/patch.diff?x=10776382580000 >