===================================================== WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected 5.16.0-rc6-syzkaller #0 Not tainted ----------------------------------------------------- syz-executor.2/12930 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: ffffffff8c80a058 (tasklist_lock){.+.+}-{2:2}, at: send_sigio+0xbe/0x300 fs/fcntl.c:810 and this task is already holding: ffff88806efb3cb8 (&f->f_owner.lock){...-}-{2:2}, at: send_sigio+0x2f/0x300 fs/fcntl.c:796 which would create a new lock dependency: (&f->f_owner.lock){...-}-{2:2} -> (tasklist_lock){.+.+}-{2:2} but this new dependency connects a SOFTIRQ-irq-safe lock: (&group->lock){..-.}-{2:2} ... which became SOFTIRQ-irq-safe at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 snd_pcm_period_elapsed+0x2c/0x210 sound/core/pcm_lib.c:1848 dummy_hrtimer_callback+0x87/0x190 sound/drivers/dummy.c:377 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x50b/0xa60 kernel/time/hrtimer.c:1749 hrtimer_run_softirq+0x1b7/0x5d0 kernel/time/hrtimer.c:1766 __do_softirq+0x392/0x7a3 kernel/softirq.c:558 __irq_exit_rcu+0xec/0x170 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 variable_test_bit arch/x86/include/asm/bitops.h:214 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline] cpumask_test_cpu include/linux/cpumask.h:344 [inline] cpu_online include/linux/cpumask.h:895 [inline] trace_lock_release+0x39/0x150 include/trace/events/lock.h:58 lock_release+0x82/0x810 kernel/locking/lockdep.c:5648 rcu_read_unlock include/linux/rcupdate.h:721 [inline] __do_sys_getpriority kernel/sys.c:321 [inline] __se_sys_getpriority+0x6b1/0x9c0 kernel/sys.c:273 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae to a SOFTIRQ-irq-unsafe lock: (tasklist_lock){.+.+}-{2:2} ... which became SOFTIRQ-irq-unsafe at: ... lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 do_wait+0x224/0x9d0 kernel/exit.c:1511 kernel_wait+0xe4/0x230 kernel/exit.c:1701 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xb4/0x220 kernel/umh.c:166 process_one_work+0x853/0x1140 kernel/workqueue.c:2298 worker_thread+0xac1/0x1320 kernel/workqueue.c:2445 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 other info that might help us debug this: Chain exists of: &group->lock --> &f->f_owner.lock --> tasklist_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(tasklist_lock); local_irq_disable(); lock(&group->lock); lock(&f->f_owner.lock); lock(&group->lock); *** DEADLOCK *** 5 locks held by syz-executor.2/12930: #0: ffff88807efb4460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:376 #1: ffff8880326621d8 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: inode_lock include/linux/fs.h:783 [inline] #1: ffff8880326621d8 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: open_last_lookups fs/namei.c:3347 [inline] #1: ffff8880326621d8 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: path_openat+0x853/0x3660 fs/namei.c:3556 #2: ffffffff90c894f8 (&fsnotify_mark_srcu){....}-{0:0}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:267 #3: ffff888075975038 (&mark->lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:349 [inline] #3: ffff888075975038 (&mark->lock){+.+.}-{2:2}, at: dnotify_handle_event+0x5d/0x450 fs/notify/dnotify/dnotify.c:89 #4: ffff88806efb3cb8 (&f->f_owner.lock){...-}-{2:2}, at: send_sigio+0x2f/0x300 fs/fcntl.c:796 the dependencies between SOFTIRQ-irq-safe lock and the holding lock: -> (&group->lock){..-.}-{2:2} { IN-SOFTIRQ-W at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 snd_pcm_period_elapsed+0x2c/0x210 sound/core/pcm_lib.c:1848 dummy_hrtimer_callback+0x87/0x190 sound/drivers/dummy.c:377 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x50b/0xa60 kernel/time/hrtimer.c:1749 hrtimer_run_softirq+0x1b7/0x5d0 kernel/time/hrtimer.c:1766 __do_softirq+0x392/0x7a3 kernel/softirq.c:558 __irq_exit_rcu+0xec/0x170 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 variable_test_bit arch/x86/include/asm/bitops.h:214 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline] cpumask_test_cpu include/linux/cpumask.h:344 [inline] cpu_online include/linux/cpumask.h:895 [inline] trace_lock_release+0x39/0x150 include/trace/events/lock.h:58 lock_release+0x82/0x810 kernel/locking/lockdep.c:5648 rcu_read_unlock include/linux/rcupdate.h:721 [inline] __do_sys_getpriority kernel/sys.c:321 [inline] __se_sys_getpriority+0x6b1/0x9c0 kernel/sys.c:273 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae INITIAL USE at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline] _raw_spin_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:170 spin_lock_irq include/linux/spinlock.h:374 [inline] snd_pcm_group_lock_irq sound/core/pcm_native.c:97 [inline] snd_pcm_stream_lock_irq sound/core/pcm_native.c:136 [inline] snd_pcm_hw_params+0xca/0x1740 sound/core/pcm_native.c:686 snd_pcm_oss_change_params_locked+0x244e/0x4460 sound/core/oss/pcm_oss.c:960 snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1104 [inline] snd_pcm_oss_make_ready sound/core/oss/pcm_oss.c:1163 [inline] snd_pcm_oss_sync+0x37c/0xee0 sound/core/oss/pcm_oss.c:1730 snd_pcm_oss_release+0x119/0x270 sound/core/oss/pcm_oss.c:2584 __fput+0x3fc/0x870 fs/file_table.c:280 task_work_run+0x146/0x1c0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x209/0x220 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae } ... key at: [] snd_pcm_group_init.__key+0x0/0x40 -> (&timer->lock){....}-{2:2} { INITIAL USE at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 snd_timer_resolution sound/core/timer.c:489 [inline] snd_timer_user_params sound/core/timer.c:1851 [inline] __snd_timer_user_ioctl+0x1b9d/0x5920 sound/core/timer.c:2100 snd_timer_user_ioctl+0x5d/0x80 sound/core/timer.c:2128 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae } ... key at: [] snd_timer_new.__key+0x0/0x40 ... acquired at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 snd_timer_notify+0x105/0x3e0 sound/core/timer.c:1086 snd_pcm_timer_notify sound/core/pcm_native.c:595 [inline] snd_pcm_post_stop sound/core/pcm_native.c:1453 [inline] snd_pcm_action_single sound/core/pcm_native.c:1229 [inline] snd_pcm_action sound/core/pcm_native.c:1310 [inline] snd_pcm_stop+0x3b8/0x4c0 sound/core/pcm_native.c:1476 snd_pcm_drop+0x16d/0x290 sound/core/pcm_native.c:2155 snd_pcm_oss_sync+0x4f4/0xee0 sound/core/oss/pcm_oss.c:1734 snd_pcm_oss_release+0x119/0x270 sound/core/oss/pcm_oss.c:2584 __fput+0x3fc/0x870 fs/file_table.c:280 task_work_run+0x146/0x1c0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x209/0x220 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae -> (&new->fa_lock){....}-{2:2} { INITIAL USE at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637 __raw_write_lock_irq include/linux/rwlock_api_smp.h:194 [inline] _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:316 fasync_remove_entry+0xff/0x1d0 fs/fcntl.c:891 __fput+0x71e/0x870 fs/file_table.c:277 task_work_run+0x146/0x1c0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x209/0x220 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae INITIAL READ USE at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:1014 [inline] kill_fasync+0x13b/0x430 fs/fcntl.c:1035 snd_timer_user_ccallback+0x370/0x540 sound/core/timer.c:1386 snd_timer_notify1+0x1ad/0x350 sound/core/timer.c:516 snd_timer_start1+0x53d/0x640 sound/core/timer.c:578 snd_timer_start sound/core/timer.c:696 [inline] snd_timer_user_start sound/core/timer.c:1984 [inline] __snd_timer_user_ioctl+0xb56/0x5920 sound/core/timer.c:2107 snd_timer_user_ioctl+0x5d/0x80 sound/core/timer.c:2128 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae } ... key at: [] fasync_insert_entry.__key+0x0/0x40 ... acquired at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:1014 [inline] kill_fasync+0x13b/0x430 fs/fcntl.c:1035 snd_timer_user_ccallback+0x370/0x540 sound/core/timer.c:1386 snd_timer_notify1+0x1ad/0x350 sound/core/timer.c:516 snd_timer_start1+0x53d/0x640 sound/core/timer.c:578 snd_timer_start sound/core/timer.c:696 [inline] snd_timer_user_start sound/core/timer.c:1984 [inline] __snd_timer_user_ioctl+0xb56/0x5920 sound/core/timer.c:2107 snd_timer_user_ioctl+0x5d/0x80 sound/core/timer.c:2128 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> (&f->f_owner.lock){...-}-{2:2} { IN-SOFTIRQ-R at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236 send_sigurg+0x25/0x360 fs/fcntl.c:835 sk_send_sigurg+0x6a/0xb0 net/core/sock.c:3172 tcp_check_urg net/ipv4/tcp_input.c:5567 [inline] tcp_urg+0x2b6/0xb40 net/ipv4/tcp_input.c:5608 tcp_rcv_state_process+0x16b9/0x2410 net/ipv4/tcp_input.c:6575 tcp_v4_do_rcv+0x68c/0xa10 net/ipv4/tcp_ipv4.c:1741 tcp_v4_rcv+0x39db/0x4890 net/ipv4/tcp_ipv4.c:2113 ip_protocol_deliver_rcu+0x1ed/0x3b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x316/0x490 net/ipv4/ip_input.c:252 __netif_receive_skb_one_core net/core/dev.c:5465 [inline] __netif_receive_skb+0x1d1/0x500 net/core/dev.c:5579 process_backlog+0x518/0x9a0 net/core/dev.c:6455 __napi_poll+0xbd/0x520 net/core/dev.c:7023 napi_poll net/core/dev.c:7090 [inline] net_rx_action+0x61c/0xf30 net/core/dev.c:7177 __do_softirq+0x392/0x7a3 kernel/softirq.c:558 run_ksoftirqd+0xc1/0x120 kernel/softirq.c:921 smpboot_thread_fn+0x533/0x9d0 kernel/smpboot.c:164 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 INITIAL USE at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637 __raw_write_lock_irq include/linux/rwlock_api_smp.h:194 [inline] _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:316 f_modown+0x38/0x340 fs/fcntl.c:91 __f_setown fs/fcntl.c:110 [inline] f_setown+0x113/0x1a0 fs/fcntl.c:138 do_fcntl+0x1a8/0x1560 fs/fcntl.c:393 __do_sys_fcntl fs/fcntl.c:472 [inline] __se_sys_fcntl+0xd8/0x1b0 fs/fcntl.c:457 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae INITIAL READ USE at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236 send_sigio+0x2f/0x300 fs/fcntl.c:796 kill_fasync_rcu fs/fcntl.c:1021 [inline] kill_fasync+0x1e4/0x430 fs/fcntl.c:1035 snd_timer_user_ccallback+0x370/0x540 sound/core/timer.c:1386 snd_timer_notify1+0x1ad/0x350 sound/core/timer.c:516 snd_timer_start1+0x53d/0x640 sound/core/timer.c:578 snd_timer_start sound/core/timer.c:696 [inline] snd_timer_user_start sound/core/timer.c:1984 [inline] __snd_timer_user_ioctl+0xb56/0x5920 sound/core/timer.c:2107 snd_timer_user_ioctl+0x5d/0x80 sound/core/timer.c:2128 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae } ... key at: [] __alloc_file.__key+0x0/0x10 ... acquired at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236 send_sigio+0x2f/0x300 fs/fcntl.c:796 kill_fasync_rcu fs/fcntl.c:1021 [inline] kill_fasync+0x1e4/0x430 fs/fcntl.c:1035 snd_timer_user_ccallback+0x370/0x540 sound/core/timer.c:1386 snd_timer_notify1+0x1ad/0x350 sound/core/timer.c:516 snd_timer_start1+0x53d/0x640 sound/core/timer.c:578 snd_timer_start sound/core/timer.c:696 [inline] snd_timer_user_start sound/core/timer.c:1984 [inline] __snd_timer_user_ioctl+0xb56/0x5920 sound/core/timer.c:2107 snd_timer_user_ioctl+0x5d/0x80 sound/core/timer.c:2128 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae the dependencies between the lock to be acquired and SOFTIRQ-irq-unsafe lock: -> (tasklist_lock){.+.+}-{2:2} { HARDIRQ-ON-R at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 do_wait+0x224/0x9d0 kernel/exit.c:1511 kernel_wait+0xe4/0x230 kernel/exit.c:1701 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xb4/0x220 kernel/umh.c:166 process_one_work+0x853/0x1140 kernel/workqueue.c:2298 worker_thread+0xac1/0x1320 kernel/workqueue.c:2445 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 SOFTIRQ-ON-R at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 do_wait+0x224/0x9d0 kernel/exit.c:1511 kernel_wait+0xe4/0x230 kernel/exit.c:1701 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xb4/0x220 kernel/umh.c:166 process_one_work+0x853/0x1140 kernel/workqueue.c:2298 worker_thread+0xac1/0x1320 kernel/workqueue.c:2445 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 INITIAL USE at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637 __raw_write_lock_irq include/linux/rwlock_api_smp.h:194 [inline] _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:316 copy_process+0x34bf/0x5ca0 kernel/fork.c:2311 kernel_clone+0x22a/0x7e0 kernel/fork.c:2582 kernel_thread+0x155/0x1d0 kernel/fork.c:2634 rest_init+0x21/0x2e0 init/main.c:690 start_kernel+0x4bf/0x56e init/main.c:1135 secondary_startup_64_no_verify+0xb1/0xbb INITIAL READ USE at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 do_wait+0x224/0x9d0 kernel/exit.c:1511 kernel_wait+0xe4/0x230 kernel/exit.c:1701 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xb4/0x220 kernel/umh.c:166 process_one_work+0x853/0x1140 kernel/workqueue.c:2298 worker_thread+0xac1/0x1320 kernel/workqueue.c:2445 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 } ... key at: [] tasklist_lock+0x18/0x40 ... acquired at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 send_sigio+0xbe/0x300 fs/fcntl.c:810 dnotify_handle_event+0x136/0x450 fs/notify/dnotify/dnotify.c:97 fsnotify_handle_event fs/notify/fsnotify.c:313 [inline] send_to_group+0x9a1/0xdd0 fs/notify/fsnotify.c:367 fsnotify+0xa65/0x1370 fs/notify/fsnotify.c:543 fsnotify_name include/linux/fsnotify.h:36 [inline] fsnotify_dirent include/linux/fsnotify.h:42 [inline] fsnotify_create include/linux/fsnotify.h:204 [inline] open_last_lookups fs/namei.c:3352 [inline] path_openat+0x1598/0x3660 fs/namei.c:3556 do_filp_open+0x277/0x4f0 fs/namei.c:3586 do_sys_openat2+0x13b/0x500 fs/open.c:1212 do_sys_open fs/open.c:1228 [inline] __do_sys_creat fs/open.c:1304 [inline] __se_sys_creat fs/open.c:1298 [inline] __x64_sys_creat+0x11f/0x160 fs/open.c:1298 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae stack backtrace: CPU: 1 PID: 12930 Comm: syz-executor.2 Not tainted 5.16.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106 print_bad_irq_dependency kernel/locking/lockdep.c:2577 [inline] check_irq_usage kernel/locking/lockdep.c:2816 [inline] check_prev_add kernel/locking/lockdep.c:3067 [inline] check_prevs_add kernel/locking/lockdep.c:3186 [inline] validate_chain+0x6f4c/0x8240 kernel/locking/lockdep.c:3801 __lock_acquire+0x1382/0x2b00 kernel/locking/lockdep.c:5027 lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 send_sigio+0xbe/0x300 fs/fcntl.c:810 dnotify_handle_event+0x136/0x450 fs/notify/dnotify/dnotify.c:97 fsnotify_handle_event fs/notify/fsnotify.c:313 [inline] send_to_group+0x9a1/0xdd0 fs/notify/fsnotify.c:367 fsnotify+0xa65/0x1370 fs/notify/fsnotify.c:543 fsnotify_name include/linux/fsnotify.h:36 [inline] fsnotify_dirent include/linux/fsnotify.h:42 [inline] fsnotify_create include/linux/fsnotify.h:204 [inline] open_last_lookups fs/namei.c:3352 [inline] path_openat+0x1598/0x3660 fs/namei.c:3556 do_filp_open+0x277/0x4f0 fs/namei.c:3586 do_sys_openat2+0x13b/0x500 fs/open.c:1212 do_sys_open fs/open.c:1228 [inline] __do_sys_creat fs/open.c:1304 [inline] __se_sys_creat fs/open.c:1298 [inline] __x64_sys_creat+0x11f/0x160 fs/open.c:1298 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fbb4226fe99 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbb40be5168 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007fbb42382f60 RCX: 00007fbb4226fe99 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000 RBP: 00007fbb422c9ff1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd3f2a44cf R14: 00007fbb40be5300 R15: 0000000000022000