syzbot

=====================================================
WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected
syzkaller #0 Not tainted
-----------------------------------------------------
syz.5.841/8342 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffffffff8ca0a058 (tasklist_lock){.+.+}-{2:2}, at: send_sigio+0xf9/0x360 fs/fcntl.c:786

and this task is already holding:
ffff88801cf90118 (&f->f_owner.lock){...-}-{2:2}, at: send_sigio+0x33/0x360 fs/fcntl.c:772
which would create a new lock dependency:
 (&f->f_owner.lock){...-}-{2:2} -> (tasklist_lock){.+.+}-{2:2}

but this new dependency connects a HARDIRQ-irq-safe lock:
 (&dev->event_lock#2){-.-.}-{2:2}

... which became HARDIRQ-irq-safe at:
  lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
  __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
  _raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162
  input_event+0x7a/0xc0 drivers/input/input.c:434
  input_report_key include/linux/input.h:425 [inline]
  psmouse_report_standard_buttons drivers/input/mouse/psmouse-base.c:128 [inline]
  psmouse_report_standard_packet+0x53/0x200 drivers/input/mouse/psmouse-base.c:146
  psmouse_process_byte+0x478/0x670 drivers/input/mouse/psmouse-base.c:237
  psmouse_handle_byte+0x43/0x490 drivers/input/mouse/psmouse-base.c:279
  ps2_interrupt+0x164/0x980 drivers/input/serio/libps2.c:613
  serio_interrupt+0x8b/0x130 drivers/input/serio/serio.c:998
  i8042_interrupt+0x394/0x730 drivers/input/serio/i8042.c:610
  __handle_irq_event_percpu+0x276/0x930 kernel/irq/handle.c:158
  handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
  handle_irq_event+0x8b/0x1e0 kernel/irq/handle.c:210
  handle_edge_irq+0x247/0xb30 kernel/irq/chip.c:831
  generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
  handle_irq arch/x86/kernel/irq.c:240 [inline]
  __common_interrupt+0x13b/0x230 arch/x86/kernel/irq.c:259
  common_interrupt+0xb4/0xd0 arch/x86/kernel/irq.c:249
  asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:678
  native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
  pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:147
  arch_safe_halt arch/x86/include/asm/paravirt.h:108 [inline]
  default_idle+0x13/0x20 arch/x86/kernel/process.c:753
  default_idle_call+0x6c/0xa0 kernel/sched/idle.c:97
  cpuidle_idle_call kernel/sched/idle.c:170 [inline]
  do_idle+0x1eb/0x510 kernel/sched/idle.c:282
  cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:380
  start_secondary+0xee/0xf0 arch/x86/kernel/smpboot.c:323
  secondary_startup_64_no_verify+0x179/0x17b

to a HARDIRQ-irq-unsafe lock:
 (tasklist_lock){.+.+}-{2:2}

... which became HARDIRQ-irq-unsafe at:
...
  lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
  __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
  _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
  do_wait+0x294/0xaf0 kernel/exit.c:1607
  kernel_wait+0xac/0x170 kernel/exit.c:1797
  call_usermodehelper_exec_sync kernel/umh.c:137 [inline]
  call_usermodehelper_exec_work+0xb9/0x220 kernel/umh.c:164
  process_one_work kernel/workqueue.c:2634 [inline]
  process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
  worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
  kthread+0x2fa/0x390 kernel/kthread.c:388
  ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
  ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293

other info that might help us debug this:

Chain exists of:
  &dev->event_lock#2 --> &f->f_owner.lock --> tasklist_lock

 Possible interrupt unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(tasklist_lock);
                               local_irq_disable();
                               lock(&dev->event_lock#2);
                               lock(&f->f_owner.lock);
  <Interrupt>
    lock(&dev->event_lock#2);

 *** DEADLOCK ***

5 locks held by syz.5.841/8342:
 #0: ffff88801cf90ac8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2a3/0x330 fs/file.c:1040
 #1: ffff88807e1ec418 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x20e/0x940 fs/read_write.c:580
 #2: ffffffff96f1d9f0 (&fsnotify_mark_srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:116 [inline]
 #2: ffffffff96f1d9f0 (&fsnotify_mark_srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:215 [inline]
 #2: ffffffff96f1d9f0 (&fsnotify_mark_srcu){.+.+}-{0:0}, at: fsnotify+0x4ee/0x1780 fs/notify/fsnotify.c:561
 #3: ffff888064dc9038 (&mark->lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #3: ffff888064dc9038 (&mark->lock){+.+.}-{2:2}, at: dnotify_handle_event+0x62/0x420 fs/notify/dnotify/dnotify.c:107
 #4: ffff88801cf90118 (&f->f_owner.lock){...-}-{2:2}, at: send_sigio+0x33/0x360 fs/fcntl.c:772

the dependencies between HARDIRQ-irq-safe lock and the holding lock:
   -> (&dev->event_lock#2){-.-.}-{2:2} {
      IN-HARDIRQ-W at:
                          lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
                          __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
                          _raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162
                          input_event+0x7a/0xc0 drivers/input/input.c:434
                          input_report_key include/linux/input.h:425 [inline]
                          psmouse_report_standard_buttons drivers/input/mouse/psmouse-base.c:128 [inline]
                          psmouse_report_standard_packet+0x53/0x200 drivers/input/mouse/psmouse-base.c:146
                          psmouse_process_byte+0x478/0x670 drivers/input/mouse/psmouse-base.c:237
                          psmouse_handle_byte+0x43/0x490 drivers/input/mouse/psmouse-base.c:279
                          ps2_interrupt+0x164/0x980 drivers/input/serio/libps2.c:613
                          serio_interrupt+0x8b/0x130 drivers/input/serio/serio.c:998
                          i8042_interrupt+0x394/0x730 drivers/input/serio/i8042.c:610
                          __handle_irq_event_percpu+0x276/0x930 kernel/irq/handle.c:158
                          handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
                          handle_irq_event+0x8b/0x1e0 kernel/irq/handle.c:210
                          handle_edge_irq+0x247/0xb30 kernel/irq/chip.c:831
                          generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
                          handle_irq arch/x86/kernel/irq.c:240 [inline]
                          __common_interrupt+0x13b/0x230 arch/x86/kernel/irq.c:259
                          common_interrupt+0xb4/0xd0 arch/x86/kernel/irq.c:249
                          asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:678
                          native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
                          pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:147
                          arch_safe_halt arch/x86/include/asm/paravirt.h:108 [inline]
                          default_idle+0x13/0x20 arch/x86/kernel/process.c:753
                          default_idle_call+0x6c/0xa0 kernel/sched/idle.c:97
                          cpuidle_idle_call kernel/sched/idle.c:170 [inline]
                          do_idle+0x1eb/0x510 kernel/sched/idle.c:282
                          cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:380
                          start_secondary+0xee/0xf0 arch/x86/kernel/smpboot.c:323
                          secondary_startup_64_no_verify+0x179/0x17b
      IN-SOFTIRQ-W at:
                          lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
                          __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
                          _raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162
                          input_inject_event+0xab/0x320 drivers/input/input.c:460
                          led_trigger_event+0x133/0x210 drivers/leds/led-triggers.c:393
                          kbd_propagate_led_state drivers/tty/vt/keyboard.c:1082 [inline]
                          kbd_bh+0x1c0/0x2d0 drivers/tty/vt/keyboard.c:1271
                          tasklet_action_common+0x2eb/0x4c0 kernel/softirq.c:809
                          handle_softirqs+0x280/0x820 kernel/softirq.c:578
                          __do_softirq kernel/softirq.c:612 [inline]
                          invoke_softirq kernel/softirq.c:452 [inline]
                          __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
                          irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
                          instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
                          sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
                          asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
                          __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
                          _raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
                          spin_unlock_irq include/linux/spinlock.h:401 [inline]
                          n_tty_ioctl_helper+0x279/0x340 drivers/tty/tty_ioctl.c:-1
                          tty_ioctl+0x9bd/0xdd0 drivers/tty/tty_io.c:2788
                          vfs_ioctl fs/ioctl.c:51 [inline]
                          __do_sys_ioctl fs/ioctl.c:871 [inline]
                          __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
                          do_syscall_x64 arch/x86/entry/common.c:51 [inline]
                          do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
                          entry_SYSCALL_64_after_hwframe+0x68/0xd2
      INITIAL USE at:
                         lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
                         __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
                         _raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162
                         input_inject_event+0xab/0x320 drivers/input/input.c:460
                         led_trigger_event+0x133/0x210 drivers/leds/led-triggers.c:393
                         kbd_led_trigger_activate+0xbd/0x100 drivers/tty/vt/keyboard.c:1036
                         led_trigger_set+0x524/0x940 drivers/leds/led-triggers.c:212
                         led_trigger_set_default+0x1a0/0x1e0 drivers/leds/led-triggers.c:276
                         led_classdev_register_ext+0x6e9/0x940 drivers/leds/led-class.c:562
                         led_classdev_register include/linux/leds.h:279 [inline]
                         input_leds_connect+0x4eb/0x6b0 drivers/input/input-leds.c:139
                         input_attach_handler drivers/input/input.c:1064 [inline]
                         input_register_device+0xcdc/0x1070 drivers/input/input.c:2470
                         atkbd_connect+0x6fb/0x9a0 drivers/input/keyboard/atkbd.c:1342
                         serio_connect_driver drivers/input/serio/serio.c:44 [inline]
                         serio_driver_probe+0x7a/0xa0 drivers/input/serio/serio.c:775
                         call_driver_probe drivers/base/dd.c:-1 [inline]
                         really_probe+0x25b/0xb40 drivers/base/dd.c:658
                         __driver_probe_device+0x18c/0x330 drivers/base/dd.c:800
                         driver_probe_device+0x4f/0x420 drivers/base/dd.c:830
                         __driver_attach+0x44e/0x6f0 drivers/base/dd.c:1216
                         bus_for_each_dev+0x22d/0x2a0 drivers/base/bus.c:370
                         serio_attach_driver drivers/input/serio/serio.c:804 [inline]
                         serio_handle_event+0x1a2/0x860 drivers/input/serio/serio.c:224
                         process_one_work kernel/workqueue.c:2634 [inline]
                         process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
                         worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
                         kthread+0x2fa/0x390 kernel/kthread.c:388
                         ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
                         ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
    }
    ... key      at: [<ffffffff97213660>] input_allocate_device.__key.5+0x0/0x20
  -> (&client->buffer_lock){....}-{2:2} {
     INITIAL USE at:
                       lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
                       __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]
                       evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261
                       evdev_events+0x1d8/0x330 drivers/input/evdev.c:306
                       input_to_handler drivers/input/input.c:129 [inline]
                       input_pass_values+0x907/0x1300 drivers/input/input.c:161
                       input_event_dispose+0x346/0x6c0 drivers/input/input.c:378
                       input_inject_event+0x1f9/0x320 drivers/input/input.c:465
                       evdev_write+0x32a/0x470 drivers/input/evdev.c:530
                       vfs_write+0x288/0x940 fs/read_write.c:582
                       ksys_write+0x147/0x250 fs/read_write.c:637
                       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
                       do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
                       entry_SYSCALL_64_after_hwframe+0x68/0xd2
   }
   ... key      at: [<ffffffff97213900>] evdev_open.__key.28+0x0/0x20
   ... acquired at:
   __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]
   evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261
   evdev_events+0x1d8/0x330 drivers/input/evdev.c:306
   input_to_handler drivers/input/input.c:129 [inline]
   input_pass_values+0x907/0x1300 drivers/input/input.c:161
   input_event_dispose+0x346/0x6c0 drivers/input/input.c:378
   input_inject_event+0x1f9/0x320 drivers/input/input.c:465
   evdev_write+0x32a/0x470 drivers/input/evdev.c:530
   vfs_write+0x288/0x940 fs/read_write.c:582
   ksys_write+0x147/0x250 fs/read_write.c:637
   do_syscall_x64 arch/x86/entry/common.c:51 [inline]
   do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
   entry_SYSCALL_64_after_hwframe+0x68/0xd2

 -> (&new->fa_lock){....}-{2:2} {
    INITIAL USE at:
                     lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
                     __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
                     _raw_write_lock_irq+0xa3/0xe0 kernel/locking/spinlock.c:326
                     fasync_remove_entry+0xf4/0x1c0 fs/fcntl.c:867
                     lease_modify+0x1a6/0x390 fs/locks.c:1402
                     locks_remove_lease fs/locks.c:2609 [inline]
                     locks_remove_file+0x4c0/0xe20 fs/locks.c:2634
                     __fput+0x18f/0x970 fs/file_table.c:376
                     task_work_run+0x1ce/0x250 kernel/task_work.c:239
                     resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
                     exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
                     exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210
                     __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
                     syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
                     do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
                     entry_SYSCALL_64_after_hwframe+0x68/0xd2
    INITIAL READ USE at:
                          lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
                          __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
                          _raw_read_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:236
                          kill_fasync_rcu fs/fcntl.c:990 [inline]
                          kill_fasync+0x192/0x4b0 fs/fcntl.c:1011
                          lease_break_callback+0x26/0x30 fs/locks.c:522
                          __break_lease+0x4a7/0x12c0 fs/locks.c:1537
                          break_lease include/linux/filelock.h:360 [inline]
                          do_dentry_open+0x823/0x1500 fs/open.c:920
                          do_open fs/namei.c:3640 [inline]
                          path_openat+0x274b/0x3190 fs/namei.c:3797
                          do_filp_open+0x1c5/0x3d0 fs/namei.c:3824
                          do_sys_openat2+0x12c/0x1c0 fs/open.c:1419
                          do_sys_open fs/open.c:1434 [inline]
                          __do_sys_creat fs/open.c:1512 [inline]
                          __se_sys_creat fs/open.c:1506 [inline]
                          __x64_sys_creat+0x90/0xb0 fs/open.c:1506
                          do_syscall_x64 arch/x86/entry/common.c:51 [inline]
                          do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
                          entry_SYSCALL_64_after_hwframe+0x68/0xd2
  }
  ... key      at: [<ffffffff96f1ab00>] fasync_insert_entry.__key+0x0/0x20
  ... acquired at:
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
   _raw_read_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:236
   kill_fasync_rcu fs/fcntl.c:990 [inline]
   kill_fasync+0x192/0x4b0 fs/fcntl.c:1011
   __pass_event drivers/input/evdev.c:240 [inline]
   evdev_pass_values+0x54b/0xab0 drivers/input/evdev.c:278
   evdev_events+0x1d8/0x330 drivers/input/evdev.c:306
   input_to_handler drivers/input/input.c:129 [inline]
   input_pass_values+0x907/0x1300 drivers/input/input.c:161
   input_event_dispose+0x346/0x6c0 drivers/input/input.c:378
   input_inject_event+0x1f9/0x320 drivers/input/input.c:465
   evdev_write+0x32a/0x470 drivers/input/evdev.c:530
   vfs_write+0x288/0x940 fs/read_write.c:582
   ksys_write+0x147/0x250 fs/read_write.c:637
   do_syscall_x64 arch/x86/entry/common.c:51 [inline]
   do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
   entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> (&f->f_owner.lock){...-}-{2:2} {
   IN-SOFTIRQ-R at:
                    lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
                    __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
                    _raw_read_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:236
                    send_sigurg+0x29/0x3c0 fs/fcntl.c:811
                    sk_send_sigurg+0x6f/0xc0 net/core/sock.c:3409
                    tcp_check_urg+0x200/0x750 net/ipv4/tcp_input.c:5772
                    tcp_urg+0x161/0x3f0 net/ipv4/tcp_input.c:5813
                    tcp_rcv_established+0xa2e/0x1cf0 net/ipv4/tcp_input.c:6168
                    tcp_v4_do_rcv+0x4ed/0xb80 net/ipv4/tcp_ipv4.c:1734
                    tcp_v4_rcv+0x2334/0x2a50 net/ipv4/tcp_ipv4.c:2166
                    ip_protocol_deliver_rcu+0x20e/0x3f0 net/ipv4/ip_input.c:205
                    ip_local_deliver_finish+0x2ca/0x510 net/ipv4/ip_input.c:233
                    NF_HOOK+0x303/0x390 include/linux/netfilter.h:304
                    NF_HOOK+0x303/0x390 include/linux/netfilter.h:304
                    __netif_receive_skb_one_core net/core/dev.c:5608 [inline]
                    __netif_receive_skb+0xcc/0x290 net/core/dev.c:5722
                    process_backlog+0x380/0x6e0 net/core/dev.c:6050
                    __napi_poll+0xc0/0x460 net/core/dev.c:6612
                    napi_poll net/core/dev.c:6679 [inline]
                    net_rx_action+0x5ea/0xbf0 net/core/dev.c:6815
                    handle_softirqs+0x280/0x820 kernel/softirq.c:578
                    run_ksoftirqd+0x9c/0xf0 kernel/softirq.c:950
                    smpboot_thread_fn+0x635/0xa00 kernel/smpboot.c:164
                    kthread+0x2fa/0x390 kernel/kthread.c:388
                    ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
                    ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
   INITIAL USE at:
                   lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
                   _raw_write_lock_irq+0xa3/0xe0 kernel/locking/spinlock.c:326
                   __f_setown+0x3b/0x330 fs/fcntl.c:92
                   fcntl_dirnotify+0x6e2/0x8d0 fs/notify/dnotify/dnotify.c:369
                   do_fcntl+0x37c/0x1380 fs/fcntl.c:400
                   __do_sys_fcntl fs/fcntl.c:448 [inline]
                   __se_sys_fcntl+0xc9/0x1a0 fs/fcntl.c:433
                   do_syscall_x64 arch/x86/entry/common.c:51 [inline]
                   do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
                   entry_SYSCALL_64_after_hwframe+0x68/0xd2
   INITIAL READ USE at:
                        lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
                        __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
                        _raw_read_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:236
                        send_sigio+0x33/0x360 fs/fcntl.c:772
                        dnotify_handle_event+0x153/0x420 fs/notify/dnotify/dnotify.c:115
                        fsnotify_handle_event fs/notify/fsnotify.c:304 [inline]
                        send_to_group fs/notify/fsnotify.c:378 [inline]
                        fsnotify+0x132e/0x1780 fs/notify/fsnotify.c:584
                        __fsnotify_parent+0x5e6/0x720 fs/notify/fsnotify.c:241
                        fsnotify_parent include/linux/fsnotify.h:77 [inline]
                        fsnotify_dentry include/linux/fsnotify.h:89 [inline]
                        fsnotify_xattr include/linux/fsnotify.h:357 [inline]
                        __vfs_setxattr_noperm+0x45c/0x5e0 fs/xattr.c:238
                        vfs_setxattr+0x16c/0x2f0 fs/xattr.c:322
                        do_setxattr fs/xattr.c:630 [inline]
                        path_setxattr+0x362/0x550 fs/xattr.c:659
                        __do_sys_setxattr fs/xattr.c:677 [inline]
                        __se_sys_setxattr fs/xattr.c:673 [inline]
                        __x64_sys_setxattr+0xbb/0xd0 fs/xattr.c:673
                        do_syscall_x64 arch/x86/entry/common.c:51 [inline]
                        do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
                        entry_SYSCALL_64_after_hwframe+0x68/0xd2
 }
 ... key      at: [<ffffffff96f19e80>] init_file.__key+0x0/0x20
 ... acquired at:
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
   _raw_read_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:236
   send_sigio+0x33/0x360 fs/fcntl.c:772
   kill_fasync_rcu fs/fcntl.c:997 [inline]
   kill_fasync+0x228/0x4b0 fs/fcntl.c:1011
   lease_break_callback+0x26/0x30 fs/locks.c:522
   __break_lease+0x4a7/0x12c0 fs/locks.c:1537
   break_lease include/linux/filelock.h:360 [inline]
   do_dentry_open+0x823/0x1500 fs/open.c:920
   do_open fs/namei.c:3640 [inline]
   path_openat+0x274b/0x3190 fs/namei.c:3797
   do_filp_open+0x1c5/0x3d0 fs/namei.c:3824
   do_sys_openat2+0x12c/0x1c0 fs/open.c:1419
   do_sys_open fs/open.c:1434 [inline]
   __do_sys_creat fs/open.c:1512 [inline]
   __se_sys_creat fs/open.c:1506 [inline]
   __x64_sys_creat+0x90/0xb0 fs/open.c:1506
   do_syscall_x64 arch/x86/entry/common.c:51 [inline]
   do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
   entry_SYSCALL_64_after_hwframe+0x68/0xd2


the dependencies between the lock to be acquired
 and HARDIRQ-irq-unsafe lock:
-> (tasklist_lock){.+.+}-{2:2} {
   HARDIRQ-ON-R at:
                    lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
                    __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
                    _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
                    do_wait+0x294/0xaf0 kernel/exit.c:1607
                    kernel_wait+0xac/0x170 kernel/exit.c:1797
                    call_usermodehelper_exec_sync kernel/umh.c:137 [inline]
                    call_usermodehelper_exec_work+0xb9/0x220 kernel/umh.c:164
                    process_one_work kernel/workqueue.c:2634 [inline]
                    process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
                    worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
                    kthread+0x2fa/0x390 kernel/kthread.c:388
                    ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
                    ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
   SOFTIRQ-ON-R at:
                    lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
                    __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
                    _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
                    do_wait+0x294/0xaf0 kernel/exit.c:1607
                    kernel_wait+0xac/0x170 kernel/exit.c:1797
                    call_usermodehelper_exec_sync kernel/umh.c:137 [inline]
                    call_usermodehelper_exec_work+0xb9/0x220 kernel/umh.c:164
                    process_one_work kernel/workqueue.c:2634 [inline]
                    process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
                    worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
                    kthread+0x2fa/0x390 kernel/kthread.c:388
                    ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
                    ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
   INITIAL USE at:
                   lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
                   _raw_write_lock_irq+0xa3/0xe0 kernel/locking/spinlock.c:326
                   copy_process+0x225d/0x3d70 kernel/fork.c:2631
                   kernel_clone+0x21b/0x840 kernel/fork.c:2914
                   user_mode_thread+0xde/0x130 kernel/fork.c:2992
                   rest_init+0x27/0x300 init/main.c:709
                   arch_call_rest_init+0xe/0x10 init/main.c:841
                   start_kernel+0x459/0x4e0 init/main.c:1086
                   x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:555
                   copy_bootdata+0x0/0xe0 arch/x86/kernel/head64.c:536
                   secondary_startup_64_no_verify+0x179/0x17b
   INITIAL READ USE at:
                        lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
                        __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
                        _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
                        do_wait+0x294/0xaf0 kernel/exit.c:1607
                        kernel_wait+0xac/0x170 kernel/exit.c:1797
                        call_usermodehelper_exec_sync kernel/umh.c:137 [inline]
                        call_usermodehelper_exec_work+0xb9/0x220 kernel/umh.c:164
                        process_one_work kernel/workqueue.c:2634 [inline]
                        process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
                        worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
                        kthread+0x2fa/0x390 kernel/kthread.c:388
                        ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
                        ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 }
 ... key      at: [<ffffffff8ca0a058>] tasklist_lock+0x18/0x40
 ... acquired at:
   __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
   _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
   send_sigio+0xf9/0x360 fs/fcntl.c:786
   dnotify_handle_event+0x153/0x420 fs/notify/dnotify/dnotify.c:115
   fsnotify_handle_event fs/notify/fsnotify.c:304 [inline]
   send_to_group fs/notify/fsnotify.c:378 [inline]
   fsnotify+0x132e/0x1780 fs/notify/fsnotify.c:584
   __fsnotify_parent+0x5e6/0x720 fs/notify/fsnotify.c:241
   fsnotify_parent include/linux/fsnotify.h:77 [inline]
   fsnotify_file include/linux/fsnotify.h:107 [inline]
   fsnotify_modify include/linux/fsnotify.h:325 [inline]
   vfs_write+0x7b2/0x940 fs/read_write.c:588
   ksys_write+0x147/0x250 fs/read_write.c:637
   do_syscall_x64 arch/x86/entry/common.c:51 [inline]
   do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
   entry_SYSCALL_64_after_hwframe+0x68/0xd2


stack backtrace:
CPU: 1 PID: 8342 Comm: syz.5.841 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 print_bad_irq_dependency kernel/locking/lockdep.c:2626 [inline]
 check_irq_usage kernel/locking/lockdep.c:2865 [inline]
 check_prev_add kernel/locking/lockdep.c:3138 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x678f/0x7c80 kernel/locking/lockdep.c:5137
 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
 _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
 send_sigio+0xf9/0x360 fs/fcntl.c:786
 dnotify_handle_event+0x153/0x420 fs/notify/dnotify/dnotify.c:115
 fsnotify_handle_event fs/notify/fsnotify.c:304 [inline]
 send_to_group fs/notify/fsnotify.c:378 [inline]
 fsnotify+0x132e/0x1780 fs/notify/fsnotify.c:584
 __fsnotify_parent+0x5e6/0x720 fs/notify/fsnotify.c:241
 fsnotify_parent include/linux/fsnotify.h:77 [inline]
 fsnotify_file include/linux/fsnotify.h:107 [inline]
 fsnotify_modify include/linux/fsnotify.h:325 [inline]
 vfs_write+0x7b2/0x940 fs/read_write.c:588
 ksys_write+0x147/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f019a58f6c9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f019b434038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f019a7e5fa0 RCX: 00007f019a58f6c9
RDX: 0000000000032600 RSI: 0000200000000100 RDI: 0000000000000004
RBP: 00007f019a611f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f019a7e6038 R14: 00007f019a7e5fa0 R15: 00007ffc36e2d1e8
 </TASK>