========================================================
WARNING: possible irq lock inversion dependency detected
6.16.0-syzkaller-11895-gcca7a0aae895 #0 Not tainted
--------------------------------------------------------
ksoftirqd/1/23 just changed the state of lock:
ffff88810b901230 (&dev->event_lock#2){..-.}-{3:3}, at: input_inject_event+0xa5/0x340
but this lock took another, SOFTIRQ-READ-unsafe lock in the past:
 (tasklist_lock){.+.+}-{3:3}


and interrupts could create inverse lock ordering between them.


other info that might help us debug this:
Chain exists of:
  &dev->event_lock#2 --> &client->buffer_lock --> tasklist_lock

 Possible interrupt unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(tasklist_lock);
                               local_irq_disable();
                               lock(&dev->event_lock#2);
                               lock(&client->buffer_lock);
  <Interrupt>
    lock(&dev->event_lock#2);

 *** DEADLOCK ***

1 lock held by ksoftirqd/1/23:
 #0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: led_trigger_event+0x4b/0x210

the shortest dependencies between 2nd lock and 1st lock:
    -> (tasklist_lock){.+.+}-{3:3} {
       HARDIRQ-ON-R at:
                            lock_acquire+0x120/0x360
                            _raw_read_lock+0x36/0x50
                            __do_wait+0xde/0x740
                            do_wait+0x1f8/0x520
                            kernel_wait+0xab/0x170
                            call_usermodehelper_exec_work+0xbe/0x230
                            process_scheduled_works+0xae1/0x17b0
                            worker_thread+0x8a0/0xda0
                            kthread+0x711/0x8a0
                            ret_from_fork+0x3fc/0x770
                            ret_from_fork_asm+0x1a/0x30
       SOFTIRQ-ON-R at:
                            lock_acquire+0x120/0x360
                            _raw_read_lock+0x36/0x50
                            __do_wait+0xde/0x740
                            do_wait+0x1f8/0x520
                            kernel_wait+0xab/0x170
                            call_usermodehelper_exec_work+0xbe/0x230
                            process_scheduled_works+0xae1/0x17b0
                            worker_thread+0x8a0/0xda0
                            kthread+0x711/0x8a0
                            ret_from_fork+0x3fc/0x770
                            ret_from_fork_asm+0x1a/0x30
       INITIAL USE at:
                           lock_acquire+0x120/0x360
                           _raw_write_lock_irq+0xa2/0xf0
                           copy_process+0x224f/0x3c00
                           kernel_clone+0x21e/0x840
                           user_mode_thread+0xdd/0x140
                           rest_init+0x23/0x300
                           start_kernel+0x3a9/0x410
                           x86_64_start_reservations+0x24/0x30
                           x86_64_start_kernel+0x143/0x1c0
                           common_startup_64+0x13e/0x147
       INITIAL READ USE at:
                                lock_acquire+0x120/0x360
                                _raw_read_lock+0x36/0x50
                                __do_wait+0xde/0x740
                                do_wait+0x1f8/0x520
                                kernel_wait+0xab/0x170
                                call_usermodehelper_exec_work+0xbe/0x230
                                process_scheduled_works+0xae1/0x17b0
                                worker_thread+0x8a0/0xda0
                                kthread+0x711/0x8a0
                                ret_from_fork+0x3fc/0x770
                                ret_from_fork_asm+0x1a/0x30
     }
     ... key      at: [<ffffffff8de0c058>] tasklist_lock+0x18/0x40
     ... acquired at:
   lock_acquire+0x120/0x360
   _raw_read_lock+0x36/0x50
   send_sigurg+0x12b/0x420
   sk_send_sigurg+0x6c/0x2e0
   tcp_check_urg+0x200/0x760
   tcp_urg+0x164/0x3f0
   tcp_rcv_established+0xf93/0x1eb0
   tcp_v4_do_rcv+0xa23/0xce0
   __release_sock+0x21c/0x350
   release_sock+0x5f/0x1f0
   tcp_sendmsg+0x39/0x50
   __sock_sendmsg+0x19c/0x270
   __sys_sendto+0x3bd/0x520
   __x64_sys_sendto+0xde/0x100
   do_syscall_64+0xfa/0x3b0
   entry_SYSCALL_64_after_hwframe+0x77/0x7f

   -> (&f_owner->lock){....}-{3:3} {
      INITIAL USE at:
                         lock_acquire+0x120/0x360
                         _raw_write_lock_irq+0xa2/0xf0
                         __f_setown+0x67/0x370
                         fcntl_dirnotify+0x3fa/0x6a0
                         do_fcntl+0x6d0/0x1910
                         __se_sys_fcntl+0xc8/0x150
                         do_syscall_64+0xfa/0x3b0
                         entry_SYSCALL_64_after_hwframe+0x77/0x7f
      INITIAL READ USE at:
                              lock_acquire+0x120/0x360
                              _raw_read_lock_irqsave+0xaf/0x100
                              send_sigio+0x38/0x370
                              dnotify_handle_event+0x169/0x440
                              fsnotify+0x1814/0x1a80
                              fsnotify_create+0x122/0x180
                              vfs_mknod+0x3ae/0x3c0
                              do_mknodat+0x385/0x4d0
                              __x64_sys_mknod+0x8c/0xa0
                              do_syscall_64+0xfa/0x3b0
                              entry_SYSCALL_64_after_hwframe+0x77/0x7f
    }
    ... key      at: [<ffffffff99b22f60>] file_f_owner_allocate.__key+0x0/0x20
    ... acquired at:
   lock_acquire+0x120/0x360
   _raw_read_lock_irqsave+0xaf/0x100
   send_sigio+0x38/0x370
   kill_fasync+0x24d/0x4d0
   sock_wake_async+0x137/0x160
   sk_wake_async+0x184/0x280
   unix_release_sock+0x768/0xd30
   unix_release+0x92/0xd0
   sock_close+0xc3/0x240
   __fput+0x44c/0xa70
   task_work_run+0x1d4/0x260
   get_signal+0x11ed/0x1340
   arch_do_signal_or_restart+0x9a/0x750
   exit_to_user_mode_loop+0x75/0x110
   do_syscall_64+0x2bd/0x3b0
   entry_SYSCALL_64_after_hwframe+0x77/0x7f

  -> (&new->fa_lock){....}-{3:3} {
     INITIAL USE at:
                       lock_acquire+0x120/0x360
                       _raw_write_lock_irq+0xa2/0xf0
                       fasync_remove_entry+0xf1/0x1c0
                       pipe_fasync+0xff/0x1e0
                       __fput+0x8a2/0xa70
                       task_work_run+0x1d4/0x260
                       exit_to_user_mode_loop+0xec/0x110
                       do_syscall_64+0x2bd/0x3b0
                       entry_SYSCALL_64_after_hwframe+0x77/0x7f
     INITIAL READ USE at:
                            lock_acquire+0x120/0x360
                            _raw_read_lock_irqsave+0xaf/0x100
                            kill_fasync+0x199/0x4d0
                            sock_wake_async+0x137/0x160
                            sock_def_readable+0x3bb/0x550
                            sk_psock_skb_ingress_enqueue+0x3e7/0x4e0
                            sk_psock_skb_ingress_self+0x299/0x350
                            sk_psock_verdict_recv+0x796/0x9a0
                            sk_psock_verdict_data_ready+0x145/0x570
                            unix_stream_sendmsg+0x860/0xdf0
                            __sock_sendmsg+0x21c/0x270
                            ____sys_sendmsg+0x505/0x830
                            ___sys_sendmsg+0x21f/0x2a0
                            __x64_sys_sendmsg+0x19b/0x260
                            do_syscall_64+0xfa/0x3b0
                            entry_SYSCALL_64_after_hwframe+0x77/0x7f
   }
   ... key      at: [<ffffffff99b22f80>] fasync_insert_entry.__key+0x0/0x20
   ... acquired at:
   lock_acquire+0x120/0x360
   _raw_read_lock_irqsave+0xaf/0x100
   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+0x2fc/0x480
   vfs_write+0x27e/0xa90
   ksys_write+0x145/0x250
   do_syscall_64+0xfa/0x3b0
   entry_SYSCALL_64_after_hwframe+0x77/0x7f

 -> (&client->buffer_lock){....}-{3:3} {
    INITIAL USE at:
                     lock_acquire+0x120/0x360
                     _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+0x2fc/0x480
                     vfs_write+0x27e/0xa90
                     ksys_write+0x145/0x250
                     do_syscall_64+0xfa/0x3b0
                     entry_SYSCALL_64_after_hwframe+0x77/0x7f
  }
  ... key      at: [<ffffffff99e22300>] evdev_open.__key.25+0x0/0x20
  ... acquired at:
   lock_acquire+0x120/0x360
   _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+0x2fc/0x480
   vfs_write+0x27e/0xa90
   ksys_write+0x145/0x250
   do_syscall_64+0xfa/0x3b0
   entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> (&dev->event_lock#2){..-.}-{3:3} {
   IN-SOFTIRQ-W at:
                    lock_acquire+0x120/0x360
                    _raw_spin_lock_irqsave+0xa7/0xf0
                    input_inject_event+0xa5/0x340
                    led_trigger_event+0x138/0x210
                    kbd_bh+0x1c6/0x2e0
                    tasklet_action_common+0x36c/0x580
                    handle_softirqs+0x286/0x870
                    run_ksoftirqd+0x9b/0x100
                    smpboot_thread_fn+0x542/0xa60
                    kthread+0x711/0x8a0
                    ret_from_fork+0x3fc/0x770
                    ret_from_fork_asm+0x1a/0x30
   INITIAL USE at:
                   lock_acquire+0x120/0x360
                   _raw_spin_lock_irqsave+0xa7/0xf0
                   input_inject_event+0xa5/0x340
                   kbd_led_trigger_activate+0xbc/0x100
                   led_trigger_set+0x52d/0x950
                   led_trigger_set_default+0x260/0x2a0
                   led_classdev_register_ext+0x73d/0x930
                   input_leds_connect+0x517/0x790
                   input_register_device+0xd0e/0x1140
                   atkbd_connect+0x72e/0xa00
                   serio_driver_probe+0x82/0xd0
                   really_probe+0x26d/0x9e0
                   __driver_probe_device+0x18c/0x2f0
                   driver_probe_device+0x4f/0x430
                   __driver_attach+0x452/0x700
                   bus_for_each_dev+0x233/0x2b0
                   serio_handle_event+0x1f9/0x8d0
                   process_scheduled_works+0xae1/0x17b0
                   worker_thread+0x8a0/0xda0
                   kthread+0x711/0x8a0
                   ret_from_fork+0x3fc/0x770
                   ret_from_fork_asm+0x1a/0x30
 }
 ... key      at: [<ffffffff99e22060>] input_allocate_device.__key.5+0x0/0x20
 ... acquired at:
   mark_lock+0x11b/0x190
   __lock_acquire+0x680/0xd20
   lock_acquire+0x120/0x360
   _raw_spin_lock_irqsave+0xa7/0xf0
   input_inject_event+0xa5/0x340
   led_trigger_event+0x138/0x210
   kbd_bh+0x1c6/0x2e0
   tasklet_action_common+0x36c/0x580
   handle_softirqs+0x286/0x870
   run_ksoftirqd+0x9b/0x100
   smpboot_thread_fn+0x542/0xa60
   kthread+0x711/0x8a0
   ret_from_fork+0x3fc/0x770
   ret_from_fork_asm+0x1a/0x30


stack backtrace:
CPU: 1 UID: 0 PID: 23 Comm: ksoftirqd/1 Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895 #0 PREEMPT(full) 
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+0x189/0x250
 print_irq_inversion_bug+0x1d2/0x1e0
 mark_lock_irq+0x35f/0x390
 mark_lock+0x11b/0x190
 __lock_acquire+0x680/0xd20
 lock_acquire+0x120/0x360
 _raw_spin_lock_irqsave+0xa7/0xf0
 input_inject_event+0xa5/0x340
 led_trigger_event+0x138/0x210
 kbd_bh+0x1c6/0x2e0
 tasklet_action_common+0x36c/0x580
 handle_softirqs+0x286/0x870
 run_ksoftirqd+0x9b/0x100
 smpboot_thread_fn+0x542/0xa60
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
