========================================================
WARNING: possible irq lock inversion dependency detected
6.16.0-syzkaller-11895-gcca7a0aae895 #0 Not tainted
--------------------------------------------------------
syz.7.7332/24245 just changed the state of lock:
ffff888029651230 (&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 ***

2 locks held by syz.7.7332/24245:
 #0: ffff888106cb4260 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x12e/0xb50
 #1: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: ___pte_offset_map+0x29/0x250

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
                              do_dentry_open+0x8b7/0x13f0
                              vfs_open+0x3b/0x340
                              dentry_open+0x61/0xa0
                              do_mq_open+0x59e/0x780
                              __x64_sys_mq_open+0x16a/0x1c0
                              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
   lease_break_callback+0x26/0x30
   __break_lease+0x6a5/0x1620
   do_dentry_open+0x8b7/0x13f0
   vfs_open+0x3b/0x340
   dentry_open+0x61/0xa0
   do_mq_open+0x59e/0x780
   __x64_sys_mq_open+0x16a/0x1c0
   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
                            do_dentry_open+0x8b7/0x13f0
                            vfs_open+0x3b/0x340
                            dentry_open+0x61/0xa0
                            do_mq_open+0x59e/0x780
                            __x64_sys_mq_open+0x16a/0x1c0
                            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_irqsave+0xa7/0xf0
                     evdev_ioctl_handler+0x1095/0x1f10
                     __se_sys_ioctl+0xfc/0x170
                     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_event+0x76/0xe0
                    hidinput_report_event+0xa1/0x100
                    hid_report_raw_event+0x148b/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
                    finish_task_switch+0x26b/0x950
                    __schedule+0x17a0/0x4cc0
                    preempt_schedule_common+0x83/0xd0
                    preempt_schedule+0xae/0xc0
                    preempt_schedule_thunk+0x16/0x30
                    _raw_spin_unlock+0x3f/0x50
                    unmap_page_range+0x3a79/0x4370
                    unmap_vmas+0x399/0x580
                    exit_mmap+0x248/0xb50
                    __mmput+0x118/0x430
                    exit_mm+0x1da/0x2c0
                    do_exit+0x648/0x2300
                    do_group_exit+0x21c/0x2d0
                    get_signal+0x1286/0x1340
                    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
   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_event+0x76/0xe0
   hidinput_report_event+0xa1/0x100
   hid_report_raw_event+0x148b/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
   finish_task_switch+0x26b/0x950
   __schedule+0x17a0/0x4cc0
   preempt_schedule_common+0x83/0xd0
   preempt_schedule+0xae/0xc0
   preempt_schedule_thunk+0x16/0x30
   _raw_spin_unlock+0x3f/0x50
   unmap_page_range+0x3a79/0x4370
   unmap_vmas+0x399/0x580
   exit_mmap+0x248/0xb50
   __mmput+0x118/0x430
   exit_mm+0x1da/0x2c0
   do_exit+0x648/0x2300
   do_group_exit+0x21c/0x2d0
   get_signal+0x1286/0x1340
   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


stack backtrace:
CPU: 0 UID: 0 PID: 24245 Comm: syz.7.7332 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:
 <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_report_event+0xa1/0x100
 hid_report_raw_event+0x148b/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:finish_task_switch+0x26b/0x950
Code: 0f 84 3c 01 00 00 48 85 db 0f 85 63 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 cf 17 ea 09 e8 5a 3f 36 00 fb 4c 8b 65 c0 <49> 8d bc 24 18 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc9000306eff8 EFLAGS: 00000282
RAX: e4a13c59a5cf5500 RBX: 0000000000000000 RCX: e4a13c59a5cf5500
RDX: 0000000000000007 RSI: ffffffff8d9b4400 RDI: ffffffff8be32600
RBP: ffffc9000306f050 R08: ffffffff8fa34237 R09: 1ffffffff1f46846
R10: dffffc0000000000 R11: fffffbfff1f46847 R12: ffff888116f99cc0
R13: dffffc0000000000 R14: ffff88802203b980 R15: ffff88804b03ab58
 __schedule+0x17a0/0x4cc0
 preempt_schedule_common+0x83/0xd0
 preempt_schedule+0xae/0xc0
 preempt_schedule_thunk+0x16/0x30
 _raw_spin_unlock+0x3f/0x50
 unmap_page_range+0x3a79/0x4370
 unmap_vmas+0x399/0x580
 exit_mmap+0x248/0xb50
 __mmput+0x118/0x430
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 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
RIP: 0033:0x7fd28678ebe9
Code: Unable to access opcode bytes at 0x7fd28678ebbf.
RSP: 002b:00007fd2875d20e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fd2869b5fa8 RCX: 00007fd28678ebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd2869b5fa8
RBP: 00007fd2869b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd2869b6038 R14: 00007ffd4f142a40 R15: 00007ffd4f142b28
 </TASK>
