========================================================
WARNING: possible irq lock inversion dependency detected
6.17.0-rc1-syzkaller-00036-gdfc0f6373094 #0 Not tainted
--------------------------------------------------------
syz-executor/14658 just changed the state of lock:
ffff888029a9b230 (&dev->event_lock#2){..-.}-{3:3}, at: input_event+0x76/0xe0
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 ***

no locks held by syz-executor/14658.

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_sigio+0x101/0x370
   kill_fasync+0x24d/0x4d0
   sock_wake_async+0x137/0x160
   sk_wake_async+0x184/0x280
   mptcp_destroy_common+0x152/0x320
   mptcp_disconnect+0x23d/0x700
   inet_shutdown+0x1c4/0x390
   __x64_sys_shutdown+0x13f/0x1a0
   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
                         generic_setlease+0xd60/0x1240
                         fcntl_setlease+0x3a2/0x4c0
                         do_fcntl+0x6a9/0x1910
                         __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
                              kill_fasync+0x24d/0x4d0
                              lease_break_callback+0x26/0x30
                              __break_lease+0x6a5/0x1620
                              vfs_truncate+0x428/0x520
                              do_sys_truncate+0xdb/0x190
                              __x64_sys_truncate+0x5b/0x70
                              do_syscall_64+0xfa/0x3b0
                              entry_SYSCALL_64_after_hwframe+0x77/0x7f
    }
    ... key      at: [<ffffffff99b2af60>] 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
   lease_break_callback+0x26/0x30
   __break_lease+0x6a5/0x1620
   vfs_truncate+0x428/0x520
   do_sys_truncate+0xdb/0x190
   __x64_sys_truncate+0x5b/0x70
   do_syscall_64+0xfa/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
                       lease_modify+0x1ca/0x3c0
                       locks_remove_file+0x4bf/0xea0
                       __fput+0x3ab/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
                            lease_break_callback+0x26/0x30
                            __break_lease+0x6a5/0x1620
                            vfs_truncate+0x428/0x520
                            do_sys_truncate+0xdb/0x190
                            __x64_sys_truncate+0x5b/0x70
                            do_syscall_64+0xfa/0x3b0
                            entry_SYSCALL_64_after_hwframe+0x77/0x7f
   }
   ... key      at: [<ffffffff99b2af80>] 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/0xb30
   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/0xb30
                     ksys_write+0x145/0x250
                     do_syscall_64+0xfa/0x3b0
                     entry_SYSCALL_64_after_hwframe+0x77/0x7f
  }
  ... key      at: [<ffffffff99e2a1a0>] 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/0xb30
   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_event+0x76/0xe0
                    hidinput_hid_event+0x12d7/0x1c90
                    hid_process_event+0x4be/0x620
                    hid_report_raw_event+0xe91/0x16d0
                    hid_input_report+0x43e/0x520
                    hid_irq_in+0x47e/0x6d0
                    __usb_hcd_giveback_urb+0x41a/0x690
                    dummy_timer+0x862/0x4550
                    __hrtimer_run_queues+0x52c/0xc60
                    hrtimer_run_softirq+0x187/0x2b0
                    handle_softirqs+0x286/0x870
                    __irq_exit_rcu+0xca/0x1f0
                    irq_exit_rcu+0x9/0x30
                    sysvec_apic_timer_interrupt+0xa6/0xc0
                    asm_sysvec_apic_timer_interrupt+0x1a/0x20
                    _raw_spin_unlock_irqrestore+0xa8/0x110
                    do_nanosleep+0x191/0x600
                    hrtimer_nanosleep+0x169/0x360
                    __se_sys_clock_nanosleep+0x2f1/0x380
                    do_syscall_64+0xfa/0x3b0
                    entry_SYSCALL_64_after_hwframe+0x77/0x7f
   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+0xd00/0x1140
                   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: [<ffffffff99e29f00>] 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_event+0x76/0xe0
   hidinput_hid_event+0x12d7/0x1c90
   hid_process_event+0x4be/0x620
   hid_report_raw_event+0xe91/0x16d0
   hid_input_report+0x43e/0x520
   hid_irq_in+0x47e/0x6d0
   __usb_hcd_giveback_urb+0x41a/0x690
   dummy_timer+0x862/0x4550
   __hrtimer_run_queues+0x52c/0xc60
   hrtimer_run_softirq+0x187/0x2b0
   handle_softirqs+0x286/0x870
   __irq_exit_rcu+0xca/0x1f0
   irq_exit_rcu+0x9/0x30
   sysvec_apic_timer_interrupt+0xa6/0xc0
   asm_sysvec_apic_timer_interrupt+0x1a/0x20
   _raw_spin_unlock_irqrestore+0xa8/0x110
   do_nanosleep+0x191/0x600
   hrtimer_nanosleep+0x169/0x360
   __se_sys_clock_nanosleep+0x2f1/0x380
   do_syscall_64+0xfa/0x3b0
   entry_SYSCALL_64_after_hwframe+0x77/0x7f


stack backtrace:
CPU: 1 UID: 0 PID: 14658 Comm: syz-executor Not tainted 6.17.0-rc1-syzkaller-00036-gdfc0f6373094 #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:
 <IRQ>
 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_event+0x76/0xe0
 hidinput_hid_event+0x12d7/0x1c90
 hid_process_event+0x4be/0x620
 hid_report_raw_event+0xe91/0x16d0
 hid_input_report+0x43e/0x520
 hid_irq_in+0x47e/0x6d0
 __usb_hcd_giveback_urb+0x41a/0x690
 dummy_timer+0x862/0x4550
 __hrtimer_run_queues+0x52c/0xc60
 hrtimer_run_softirq+0x187/0x2b0
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110
Code: 74 05 e8 8b 76 4b f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> f3 1d 14 f6 65 8b 05 6c 61 24 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc900266dfb60 EFLAGS: 00000206
RAX: 132822e8dd97e200 RBX: 0000000000000a02 RCX: 132822e8dd97e200
RDX: 0000000000000000 RSI: ffffffff8d9b6dbe RDI: 0000000000000001
RBP: ffffc900266dfbf0 R08: ffffffff8fa37e37 R09: 1ffffffff1f46fc6
R10: dffffc0000000000 R11: fffffbfff1f46fc7 R12: dffffc0000000000
R13: ffffc900266dfd80 R14: ffff888136627a80 R15: 1ffff92004cdbf6c
 do_nanosleep+0x191/0x600
 hrtimer_nanosleep+0x169/0x360
 __se_sys_clock_nanosleep+0x2f1/0x380
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f00871c14a5
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007ffce2132590 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 0000000000000023 RCX: 00007f00871c14a5
RDX: 00007ffce21325d0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffce213263c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000001388
R13: 00000000000927c0 R14: 000000000009d176 R15: 00007ffce2132690
 </TASK>
