=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
syzkaller #0 Tainted: G             L     
-----------------------------------------------------
syz.9.11350/4286 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffffffff8e40c058 (tasklist_lock){.+.+}-{3:3}, at: send_sigurg+0x12b/0x420

and this task is already holding:
ffff8881a99bc320 (&f_owner->lock){....}-{3:3}, at: send_sigurg+0x55/0x420
which would create a new lock dependency:
 (&f_owner->lock){....}-{3:3} -> (tasklist_lock){.+.+}-{3:3}

but this new dependency connects a SOFTIRQ-irq-safe lock:
 (&dev->event_lock#2){..-.}-{3:3}

... which became SOFTIRQ-irq-safe at:
  lock_acquire+0xf0/0x2e0
  _raw_spin_lock_irqsave+0x40/0x60
  input_event+0x76/0xe0
  atp_complete_geyser_3_4+0xf0c/0x1d90
  __usb_hcd_giveback_urb+0x376/0x540
  dummy_timer+0xbbd/0x4650
  __hrtimer_run_queues+0x53a/0xcc0
  hrtimer_run_softirq+0x182/0x5a0
  handle_softirqs+0x22a/0x870
  __irq_exit_rcu+0x5f/0x150
  irq_exit_rcu+0x9/0x30
  sysvec_apic_timer_interrupt+0xa6/0xc0
  asm_sysvec_apic_timer_interrupt+0x1a/0x20
  _raw_spin_unlock_irqrestore+0x47/0x80
  dummy_urb_enqueue+0x58a/0x780
  usb_hcd_submit_urb+0x328/0x1b70
  atp_open+0x60/0x90
  input_open_device+0x1f8/0x3b0
  mousedev_open_device+0xcc/0x150
  mousedev_open+0x2ef/0x4a0
  chrdev_open+0x4cd/0x5e0
  do_dentry_open+0x785/0x14e0
  vfs_open+0x3b/0x340
  path_openat+0x2e08/0x3860
  do_file_open+0x23e/0x4a0
  do_sys_openat2+0x113/0x200
  __x64_sys_openat+0x138/0x170
  do_syscall_64+0x14d/0xf80
  entry_SYSCALL_64_after_hwframe+0x77/0x7f

to a SOFTIRQ-irq-unsafe lock:
 (tasklist_lock){.+.+}-{3:3}

... which became SOFTIRQ-irq-unsafe at:
...
  lock_acquire+0xf0/0x2e0
  _raw_read_lock+0x36/0x50
  __do_wait+0xde/0x740
  do_wait+0x1e7/0x540
  kernel_wait+0xd6/0x1c0
  call_usermodehelper_exec_work+0xbe/0x230
  process_scheduled_works+0xb6e/0x18c0
  worker_thread+0xa53/0xfc0
  kthread+0x388/0x470
  ret_from_fork+0x51e/0xb90
  ret_from_fork_asm+0x1a/0x30

other info that might help us debug this:

Chain exists of:
  &dev->event_lock#2 --> &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_owner->lock);
  <Interrupt>
    lock(&dev->event_lock#2);

 *** DEADLOCK ***

2 locks held by syz.9.11350/4286:
 #0: ffff888114ac18e0 (&u->lock){+.+.}-{3:3}, at: queue_oob+0x1b6/0x4f0
 #1: ffff8881a99bc320 (&f_owner->lock){....}-{3:3}, at: send_sigurg+0x55/0x420

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
   -> (&dev->event_lock#2){..-.}-{3:3} {
      IN-SOFTIRQ-W at:
                          lock_acquire+0xf0/0x2e0
                          _raw_spin_lock_irqsave+0x40/0x60
                          input_event+0x76/0xe0
                          atp_complete_geyser_3_4+0xf0c/0x1d90
                          __usb_hcd_giveback_urb+0x376/0x540
                          dummy_timer+0xbbd/0x4650
                          __hrtimer_run_queues+0x53a/0xcc0
                          hrtimer_run_softirq+0x182/0x5a0
                          handle_softirqs+0x22a/0x870
                          __irq_exit_rcu+0x5f/0x150
                          irq_exit_rcu+0x9/0x30
                          sysvec_apic_timer_interrupt+0xa6/0xc0
                          asm_sysvec_apic_timer_interrupt+0x1a/0x20
                          _raw_spin_unlock_irqrestore+0x47/0x80
                          dummy_urb_enqueue+0x58a/0x780
                          usb_hcd_submit_urb+0x328/0x1b70
                          atp_open+0x60/0x90
                          input_open_device+0x1f8/0x3b0
                          mousedev_open_device+0xcc/0x150
                          mousedev_open+0x2ef/0x4a0
                          chrdev_open+0x4cd/0x5e0
                          do_dentry_open+0x785/0x14e0
                          vfs_open+0x3b/0x340
                          path_openat+0x2e08/0x3860
                          do_file_open+0x23e/0x4a0
                          do_sys_openat2+0x113/0x200
                          __x64_sys_openat+0x138/0x170
                          do_syscall_64+0x14d/0xf80
                          entry_SYSCALL_64_after_hwframe+0x77/0x7f
      INITIAL USE at:
                         lock_acquire+0xf0/0x2e0
                         _raw_spin_lock_irqsave+0x40/0x60
                         input_inject_event+0xa5/0x340
                         kbd_led_trigger_activate+0xbc/0x100
                         led_trigger_set+0x535/0x960
                         led_trigger_set_default+0x260/0x2a0
                         led_classdev_register_ext+0x787/0x9c0
                         input_leds_connect+0x517/0x790
                         input_register_device+0xd00/0x1160
                         atkbd_connect+0x731/0xa50
                         serio_driver_probe+0x82/0xd0
                         really_probe+0x267/0xaf0
                         __driver_probe_device+0x18c/0x320
                         driver_probe_device+0x4f/0x240
                         __driver_attach+0x34c/0x640
                         bus_for_each_dev+0x23b/0x2c0
                         serio_handle_event+0x20a/0xdd0
                         process_scheduled_works+0xb6e/0x18c0
                         worker_thread+0xa53/0xfc0
                         kthread+0x388/0x470
                         ret_from_fork+0x51e/0xb90
                         ret_from_fork_asm+0x1a/0x30
    }
    ... key      at: [<ffffffff9a617c60>] input_allocate_device.__key.7+0x0/0x20
  -> (&client->buffer_lock){....}-{3:3} {
     INITIAL USE at:
                       lock_acquire+0xf0/0x2e0
                       _raw_spin_lock+0x2e/0x40
                       evdev_pass_values+0xb9/0xbd0
                       evdev_events+0x1e6/0x340
                       input_pass_values+0x288/0x890
                       input_event_dispose+0x330/0x6b0
                       input_inject_event+0x1dd/0x340
                       evdev_write+0x325/0x4c0
                       vfs_write+0x29a/0xb90
                       ksys_write+0x150/0x270
                       do_syscall_64+0x14d/0xf80
                       entry_SYSCALL_64_after_hwframe+0x77/0x7f
   }
   ... key      at: [<ffffffff9a617f00>] evdev_open.__key.27+0x0/0x20
   ... acquired at:
   _raw_spin_lock+0x2e/0x40
   evdev_pass_values+0xb9/0xbd0
   evdev_events+0x1e6/0x340
   input_pass_values+0x288/0x890
   input_event_dispose+0x330/0x6b0
   input_inject_event+0x1dd/0x340
   evdev_write+0x325/0x4c0
   vfs_write+0x29a/0xb90
   ksys_write+0x150/0x270
   do_syscall_64+0x14d/0xf80
   entry_SYSCALL_64_after_hwframe+0x77/0x7f

 -> (&new->fa_lock){....}-{3:3} {
    INITIAL USE at:
                     lock_acquire+0xf0/0x2e0
                     _raw_write_lock_irq+0x3d/0x50
                     fasync_remove_entry+0xf1/0x1c0
                     sock_fasync+0x85/0xf0
                     __fput+0x8a5/0xa70
                     task_work_run+0x1d9/0x270
                     exit_to_user_mode_loop+0xed/0x480
                     do_syscall_64+0x32d/0xf80
                     entry_SYSCALL_64_after_hwframe+0x77/0x7f
    INITIAL READ USE at:
                          lock_acquire+0xf0/0x2e0
                          _raw_read_lock_irqsave+0x48/0x60
                          kill_fasync+0x199/0x4d0
                          lease_break_callback+0x26/0x30
                          __break_lease+0x81c/0x1e80
                          do_dentry_open+0x1010/0x14e0
                          vfs_open+0x3b/0x340
                          path_openat+0x2e08/0x3860
                          do_file_open+0x23e/0x4a0
                          do_sys_openat2+0x113/0x200
                          __x64_sys_openat+0x138/0x170
                          do_syscall_64+0x14d/0xf80
                          entry_SYSCALL_64_after_hwframe+0x77/0x7f
  }
  ... key      at: [<ffffffff9a2f8700>] fasync_insert_entry.__key+0x0/0x20
  ... acquired at:
   _raw_read_lock_irqsave+0x48/0x60
   kill_fasync+0x199/0x4d0
   evdev_pass_values+0x627/0xbd0
   evdev_events+0x1e6/0x340
   input_pass_values+0x288/0x890
   input_event_dispose+0x330/0x6b0
   input_inject_event+0x1dd/0x340
   evdev_write+0x325/0x4c0
   vfs_write+0x29a/0xb90
   ksys_write+0x150/0x270
   do_syscall_64+0x14d/0xf80
   entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> (&f_owner->lock){....}-{3:3} {
   INITIAL USE at:
                   lock_acquire+0xf0/0x2e0
                   _raw_write_lock_irq+0x3d/0x50
                   __f_setown+0x67/0x370
                   fcntl_dirnotify+0x3f9/0x6a0
                   do_fcntl+0x77e/0x1a20
                   __se_sys_fcntl+0xc8/0x150
                   do_syscall_64+0x14d/0xf80
                   entry_SYSCALL_64_after_hwframe+0x77/0x7f
   INITIAL READ USE at:
                        lock_acquire+0xf0/0x2e0
                        _raw_read_lock_irqsave+0x48/0x60
                        send_sigio+0x38/0x370
                        dnotify_handle_event+0x169/0x440
                        fsnotify+0x168e/0x1ae0
                        __fsnotify_parent+0x50d/0x620
                        iterate_dir+0x3ea/0x570
                        __se_sys_getdents+0xf1/0x270
                        do_syscall_64+0x14d/0xf80
                        entry_SYSCALL_64_after_hwframe+0x77/0x7f
 }
 ... key      at: [<ffffffff9a2f86e0>] file_f_owner_allocate.__key+0x0/0x20
 ... acquired at:
   _raw_read_lock_irqsave+0x48/0x60
   send_sigio+0x38/0x370
   kill_fasync+0x24d/0x4d0
   lease_break_callback+0x26/0x30
   __break_lease+0x81c/0x1e80
   do_dentry_open+0x1010/0x14e0
   vfs_open+0x3b/0x340
   path_openat+0x2e08/0x3860
   do_file_open+0x23e/0x4a0
   do_sys_openat2+0x113/0x200
   __x64_sys_openat+0x138/0x170
   do_syscall_64+0x14d/0xf80
   entry_SYSCALL_64_after_hwframe+0x77/0x7f


the dependencies between the lock to be acquired
 and SOFTIRQ-irq-unsafe lock:
-> (tasklist_lock){.+.+}-{3:3} {
   HARDIRQ-ON-R at:
                    lock_acquire+0xf0/0x2e0
                    _raw_read_lock+0x36/0x50
                    __do_wait+0xde/0x740
                    do_wait+0x1e7/0x540
                    kernel_wait+0xd6/0x1c0
                    call_usermodehelper_exec_work+0xbe/0x230
                    process_scheduled_works+0xb6e/0x18c0
                    worker_thread+0xa53/0xfc0
                    kthread+0x388/0x470
                    ret_from_fork+0x51e/0xb90
                    ret_from_fork_asm+0x1a/0x30
   SOFTIRQ-ON-R at:
                    lock_acquire+0xf0/0x2e0
                    _raw_read_lock+0x36/0x50
                    __do_wait+0xde/0x740
                    do_wait+0x1e7/0x540
                    kernel_wait+0xd6/0x1c0
                    call_usermodehelper_exec_work+0xbe/0x230
                    process_scheduled_works+0xb6e/0x18c0
                    worker_thread+0xa53/0xfc0
                    kthread+0x388/0x470
                    ret_from_fork+0x51e/0xb90
                    ret_from_fork_asm+0x1a/0x30
   INITIAL USE at:
                   lock_acquire+0xf0/0x2e0
                   _raw_write_lock_irq+0x3d/0x50
                   copy_process+0x247a/0x3cd0
                   kernel_clone+0x248/0x8e0
                   user_mode_thread+0x110/0x180
                   rest_init+0x23/0x300
                   start_kernel+0x385/0x3d0
                   x86_64_start_reservations+0x24/0x30
                   x86_64_start_kernel+0x143/0x1c0
                   common_startup_64+0x13e/0x147
   INITIAL READ USE at:
                        lock_acquire+0xf0/0x2e0
                        _raw_read_lock+0x36/0x50
                        __do_wait+0xde/0x740
                        do_wait+0x1e7/0x540
                        kernel_wait+0xd6/0x1c0
                        call_usermodehelper_exec_work+0xbe/0x230
                        process_scheduled_works+0xb6e/0x18c0
                        worker_thread+0xa53/0xfc0
                        kthread+0x388/0x470
                        ret_from_fork+0x51e/0xb90
                        ret_from_fork_asm+0x1a/0x30
 }
 ... key      at: [<ffffffff8e40c058>] tasklist_lock+0x18/0x40
 ... acquired at:
   _raw_read_lock+0x36/0x50
   send_sigurg+0x12b/0x420
   sk_send_sigurg+0x6c/0x2e0
   queue_oob+0x42c/0x4f0
   unix_stream_sendmsg+0xcb1/0xe80
   ____sys_sendmsg+0x972/0x9f0
   ___sys_sendmsg+0x2a5/0x360
   __x64_sys_sendmsg+0x1bd/0x2a0
   do_syscall_64+0x14d/0xf80
   entry_SYSCALL_64_after_hwframe+0x77/0x7f


stack backtrace:
CPU: 1 UID: 0 PID: 4286 Comm: syz.9.11350 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 __lock_acquire+0x2a94/0x2cf0
 lock_acquire+0xf0/0x2e0
 _raw_read_lock+0x36/0x50
 send_sigurg+0x12b/0x420
 sk_send_sigurg+0x6c/0x2e0
 queue_oob+0x42c/0x4f0
 unix_stream_sendmsg+0xcb1/0xe80
 ____sys_sendmsg+0x972/0x9f0
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4bd999c819
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4bd7bf6028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f4bd9c15fa0 RCX: 00007f4bd999c819
RDX: 00000000240408c1 RSI: 0000200000000080 RDI: 0000000000000004
RBP: 00007f4bd9a32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4bd9c16038 R14: 00007f4bd9c15fa0 R15: 00007ffc0573c2a8
 </TASK>
