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Wed, 16 Jul 2025 20:55:03 -0700 (PDT) Date: Wed, 16 Jul 2025 20:55:03 -0700 In-Reply-To: <20250717014623.2253-1-hdanton@sina.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68787417.a70a0220.693ce.0037.GAE@google.com> Subject: Re: [syzbot] [mm?] KASAN: slab-use-after-free Read in mas_next_slot (2) From: syzbot To: akpm@linux-foundation.org, hdanton@sina.com, liam.howlett@oracle.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, syzkaller-bugs@googlegroups.com, vbabka@suse.cz Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: a1yfp9wgwgkkq59sq8w73qaoqapof7tt X-Rspamd-Queue-Id: 0E5E6180005 X-Rspamd-Server: rspam10 X-Rspam-User: X-HE-Tag: 1752724503-791177 X-HE-Meta: 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 8oNGaJu7 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 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: 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