syzbot

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
syzkaller #0 Not tainted
-----------------------------------------------------
syz.1.6073/21779 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffff88807c02f948 (&new->fa_lock){....}-{3:3}, at: kill_fasync_rcu fs/fcntl.c:1122 [inline]
ffff88807c02f948 (&new->fa_lock){....}-{3:3}, at: kill_fasync fs/fcntl.c:1146 [inline]
ffff88807c02f948 (&new->fa_lock){....}-{3:3}, at: kill_fasync+0x138/0x510 fs/fcntl.c:1139

and this task is already holding:
ffff888053e8a028 (&client->buffer_lock){..-.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
ffff888053e8a028 (&client->buffer_lock){..-.}-{3:3}, at: evdev_pass_values+0x10e/0x9b0 drivers/input/evdev.c:261
which would create a new lock dependency:
 (&client->buffer_lock){..-.}-{3:3} -> (&new->fa_lock){....}-{3:3}

but this new dependency connects a SOFTIRQ-irq-safe lock:
 (&client->buffer_lock){..-.}-{3:3}

... which became SOFTIRQ-irq-safe at:
  lock_acquire kernel/locking/lockdep.c:5868 [inline]
  lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
  __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+0x10e/0x9b0 drivers/input/evdev.c:261
  evdev_events+0x1bb/0x390 drivers/input/evdev.c:306
  input_pass_values+0x74e/0x880 drivers/input/input.c:128
  input_event_dispose drivers/input/input.c:353 [inline]
  input_handle_event+0xb29/0x14d0 drivers/input/input.c:370
  input_event drivers/input/input.c:396 [inline]
  input_event+0x8e/0xd0 drivers/input/input.c:391
  hidinput_hid_event+0x90b/0x2440 drivers/hid/hid-input.c:1730
  hid_process_event+0x4b7/0x5e0 drivers/hid/hid-core.c:1565
  hid_process_report drivers/hid/hid-core.c:1713 [inline]
  hid_report_raw_event+0xa0a/0x1290 drivers/hid/hid-core.c:2074
  __hid_input_report.constprop.0+0x33f/0x450 drivers/hid/hid-core.c:2144
  hid_irq_in+0x35e/0x870 drivers/hid/usbhid/hid-core.c:286
  __usb_hcd_giveback_urb+0x38b/0x610 drivers/usb/core/hcd.c:1661
  usb_hcd_giveback_urb+0x39b/0x450 drivers/usb/core/hcd.c:1745
  dummy_timer+0x1809/0x3a00 drivers/usb/gadget/udc/dummy_hcd.c:1995
  __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
  __hrtimer_run_queues+0x202/0xad0 kernel/time/hrtimer.c:1841
  hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858
  handle_softirqs+0x219/0x8e0 kernel/softirq.c:622
  __do_softirq kernel/softirq.c:656 [inline]
  invoke_softirq kernel/softirq.c:496 [inline]
  __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723
  irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
  instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
  sysvec_apic_timer_interrupt+0x57/0xc0 arch/x86/kernel/apic/apic.c:1052
  asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697

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

... which became SOFTIRQ-irq-unsafe at:
...
  lock_acquire kernel/locking/lockdep.c:5868 [inline]
  lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
  __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
  _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
  __do_wait+0x105/0x890 kernel/exit.c:1667
  do_wait+0x21d/0x590 kernel/exit.c:1711
  kernel_wait+0x9f/0x160 kernel/exit.c:1887
  call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
  call_usermodehelper_exec_work+0xf1/0x170 kernel/umh.c:163
  process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263
  process_scheduled_works kernel/workqueue.c:3346 [inline]
  worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427
  kthread+0x3c5/0x780 kernel/kthread.c:463
  ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

other info that might help us debug this:

Chain exists of:
  &client->buffer_lock --> &new->fa_lock --> tasklist_lock

 Possible interrupt unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(tasklist_lock);
                               local_irq_disable();
                               lock(&client->buffer_lock);
                               lock(&new->fa_lock);
  <Interrupt>
    lock(&client->buffer_lock);

 *** DEADLOCK ***

7 locks held by syz.1.6073/21779:
 #0: ffff888146f7b118 (&evdev->mutex){+.+.}-{4:4}, at: evdev_write+0x206/0x750 drivers/input/evdev.c:511
 #1: ffff8880213c8230 (&dev->event_lock#2){..-.}-{3:3}, at: class_spinlock_irqsave_constructor include/linux/spinlock.h:585 [inline]
 #1: ffff8880213c8230 (&dev->event_lock#2){..-.}-{3:3}, at: input_inject_event+0x9f/0x3b0 drivers/input/input.c:419
 #2: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #2: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
 #2: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
 #2: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: input_inject_event+0xbb/0x3b0 drivers/input/input.c:420
 #3: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #3: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
 #3: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
 #3: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: input_pass_values+0x80/0x880 drivers/input/input.c:119
 #4: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #4: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
 #4: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: evdev_events+0x7b/0x390 drivers/input/evdev.c:298
 #5: ffff888053e8a028 (&client->buffer_lock){..-.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #5: ffff888053e8a028 (&client->buffer_lock){..-.}-{3:3}, at: evdev_pass_values+0x10e/0x9b0 drivers/input/evdev.c:261
 #6: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #6: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
 #6: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: kill_fasync fs/fcntl.c:1145 [inline]
 #6: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: kill_fasync+0x62/0x510 fs/fcntl.c:1139

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
-> (&client->buffer_lock){..-.}-{3:3} {
   IN-SOFTIRQ-W at:
                    lock_acquire kernel/locking/lockdep.c:5868 [inline]
                    lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
                    __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+0x10e/0x9b0 drivers/input/evdev.c:261
                    evdev_events+0x1bb/0x390 drivers/input/evdev.c:306
                    input_pass_values+0x74e/0x880 drivers/input/input.c:128
                    input_event_dispose drivers/input/input.c:353 [inline]
                    input_handle_event+0xb29/0x14d0 drivers/input/input.c:370
                    input_event drivers/input/input.c:396 [inline]
                    input_event+0x8e/0xd0 drivers/input/input.c:391
                    hidinput_hid_event+0x90b/0x2440 drivers/hid/hid-input.c:1730
                    hid_process_event+0x4b7/0x5e0 drivers/hid/hid-core.c:1565
                    hid_process_report drivers/hid/hid-core.c:1713 [inline]
                    hid_report_raw_event+0xa0a/0x1290 drivers/hid/hid-core.c:2074
                    __hid_input_report.constprop.0+0x33f/0x450 drivers/hid/hid-core.c:2144
                    hid_irq_in+0x35e/0x870 drivers/hid/usbhid/hid-core.c:286
                    __usb_hcd_giveback_urb+0x38b/0x610 drivers/usb/core/hcd.c:1661
                    usb_hcd_giveback_urb+0x39b/0x450 drivers/usb/core/hcd.c:1745
                    dummy_timer+0x1809/0x3a00 drivers/usb/gadget/udc/dummy_hcd.c:1995
                    __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
                    __hrtimer_run_queues+0x202/0xad0 kernel/time/hrtimer.c:1841
                    hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858
                    handle_softirqs+0x219/0x8e0 kernel/softirq.c:622
                    __do_softirq kernel/softirq.c:656 [inline]
                    invoke_softirq kernel/softirq.c:496 [inline]
                    __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723
                    irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
                    instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
                    sysvec_apic_timer_interrupt+0x57/0xc0 arch/x86/kernel/apic/apic.c:1052
                    asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
   INITIAL USE at:
                   lock_acquire kernel/locking/lockdep.c:5868 [inline]
                   lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
                   __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+0x10e/0x9b0 drivers/input/evdev.c:261
                   evdev_events+0x1bb/0x390 drivers/input/evdev.c:306
                   input_pass_values+0x74e/0x880 drivers/input/input.c:128
                   input_event_dispose drivers/input/input.c:342 [inline]
                   input_handle_event+0xf00/0x14d0 drivers/input/input.c:370
                   input_inject_event+0x1e8/0x3b0 drivers/input/input.c:424
                   evdev_write+0x457/0x750 drivers/input/evdev.c:528
                   vfs_write+0x2a0/0x11d0 fs/read_write.c:684
                   ksys_write+0x1f8/0x250 fs/read_write.c:738
                   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                   do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
                   entry_SYSCALL_64_after_hwframe+0x77/0x7f
 }
 ... key      at: [<ffffffff9ae24fa0>] __key.83+0x0/0x40

the dependencies between the lock to be acquired
 and SOFTIRQ-irq-unsafe lock:
  -> (tasklist_lock){.+.+}-{3:3} {
     HARDIRQ-ON-R at:
                        lock_acquire kernel/locking/lockdep.c:5868 [inline]
                        lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
                        __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
                        _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
                        __do_wait+0x105/0x890 kernel/exit.c:1667
                        do_wait+0x21d/0x590 kernel/exit.c:1711
                        kernel_wait+0x9f/0x160 kernel/exit.c:1887
                        call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
                        call_usermodehelper_exec_work+0xf1/0x170 kernel/umh.c:163
                        process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263
                        process_scheduled_works kernel/workqueue.c:3346 [inline]
                        worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427
                        kthread+0x3c5/0x780 kernel/kthread.c:463
                        ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
                        ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
     SOFTIRQ-ON-R at:
                        lock_acquire kernel/locking/lockdep.c:5868 [inline]
                        lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
                        __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
                        _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
                        __do_wait+0x105/0x890 kernel/exit.c:1667
                        do_wait+0x21d/0x590 kernel/exit.c:1711
                        kernel_wait+0x9f/0x160 kernel/exit.c:1887
                        call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
                        call_usermodehelper_exec_work+0xf1/0x170 kernel/umh.c:163
                        process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263
                        process_scheduled_works kernel/workqueue.c:3346 [inline]
                        worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427
                        kthread+0x3c5/0x780 kernel/kthread.c:463
                        ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
                        ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
     INITIAL USE at:
                       lock_acquire kernel/locking/lockdep.c:5868 [inline]
                       lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
                       __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
                       _raw_write_lock_irq+0x36/0x50 kernel/locking/spinlock.c:326
                       copy_process+0x4fe3/0x76a0 kernel/fork.c:2327
                       kernel_clone+0xfc/0x930 kernel/fork.c:2609
                       user_mode_thread+0xc8/0x110 kernel/fork.c:2685
                       rest_init+0x23/0x2b0 init/main.c:722
                       start_kernel+0x3f6/0x4e0 init/main.c:1111
                       x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:310
                       x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:291
                       common_startup_64+0x13e/0x148
     INITIAL READ USE at:
                            lock_acquire kernel/locking/lockdep.c:5868 [inline]
                            lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
                            __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
                            _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
                            __do_wait+0x105/0x890 kernel/exit.c:1667
                            do_wait+0x21d/0x590 kernel/exit.c:1711
                            kernel_wait+0x9f/0x160 kernel/exit.c:1887
                            call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
                            call_usermodehelper_exec_work+0xf1/0x170 kernel/umh.c:163
                            process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263
                            process_scheduled_works kernel/workqueue.c:3346 [inline]
                            worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427
                            kthread+0x3c5/0x780 kernel/kthread.c:463
                            ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
                            ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
   }
   ... key      at: [<ffffffff8e00c098>] tasklist_lock+0x18/0x40
   ... acquired at:
   __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
   _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
   send_sigurg+0xed/0xc80 fs/fcntl.c:965
   sk_send_sigurg+0x76/0x360 net/core/sock.c:3609
   queue_oob net/unix/af_unix.c:2380 [inline]
   unix_stream_sendmsg+0xfa5/0x1340 net/unix/af_unix.c:2516
   sock_sendmsg_nosec net/socket.c:727 [inline]
   __sock_sendmsg net/socket.c:742 [inline]
   ____sys_sendmsg+0xa98/0xc70 net/socket.c:2630
   ___sys_sendmsg+0x134/0x1d0 net/socket.c:2684
   __sys_sendmmsg+0x200/0x420 net/socket.c:2773
   __do_sys_sendmmsg net/socket.c:2800 [inline]
   __se_sys_sendmmsg net/socket.c:2797 [inline]
   __x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2797
   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
   do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
   entry_SYSCALL_64_after_hwframe+0x77/0x7f

 -> (&f_owner->lock){....}-{3:3} {
    INITIAL USE at:
                     lock_acquire kernel/locking/lockdep.c:5868 [inline]
                     lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
                     __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
                     _raw_write_lock_irq+0x36/0x50 kernel/locking/spinlock.c:326
                     __f_setown+0x61/0x3c0 fs/fcntl.c:136
                     generic_add_lease fs/locks.c:1874 [inline]
                     generic_setlease fs/locks.c:1942 [inline]
                     generic_setlease+0xef2/0x1300 fs/locks.c:1929
                     kernel_setlease+0x106/0x140 fs/locks.c:1991
                     vfs_setlease+0x258/0x2d0 fs/locks.c:2026
                     do_fcntl_add_lease fs/locks.c:2047 [inline]
                     fcntl_setlease+0x3ed/0x5a0 fs/locks.c:2069
                     do_fcntl+0x751/0x15a0 fs/fcntl.c:534
                     __do_sys_fcntl fs/fcntl.c:589 [inline]
                     __se_sys_fcntl fs/fcntl.c:574 [inline]
                     __x64_sys_fcntl+0x163/0x200 fs/fcntl.c:574
                     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                     do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
                     entry_SYSCALL_64_after_hwframe+0x77/0x7f
    INITIAL READ USE at:
                          lock_acquire kernel/locking/lockdep.c:5868 [inline]
                          lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
                          __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
                          _raw_read_lock_irqsave+0x74/0x90 kernel/locking/spinlock.c:236
                          send_sigio+0x31/0x3e0 fs/fcntl.c:905
                          kill_fasync_rcu fs/fcntl.c:1131 [inline]
                          kill_fasync fs/fcntl.c:1146 [inline]
                          kill_fasync+0x214/0x510 fs/fcntl.c:1139
                          sock_wake_async+0x132/0x160 net/socket.c:1509
                          sk_wake_async include/net/sock.h:2539 [inline]
                          sk_wake_async include/net/sock.h:2535 [inline]
                          unix_release_sock+0xc3a/0x1530 net/unix/af_unix.c:712
                          unix_release+0x91/0xf0 net/unix/af_unix.c:1196
                          __sock_release+0xb3/0x270 net/socket.c:662
                          sock_close+0x1c/0x30 net/socket.c:1455
                          __fput+0x402/0xb70 fs/file_table.c:468
                          task_work_run+0x150/0x240 kernel/task_work.c:227
                          resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
                          exit_to_user_mode_loop+0xec/0x130 kernel/entry/common.c:43
                          exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
                          syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
                          syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
                          do_syscall_64+0x426/0xfa0 arch/x86/entry/syscall_64.c:100
                          entry_SYSCALL_64_after_hwframe+0x77/0x7f
  }
  ... key      at: [<ffffffff9ab3fda0>] __key.1+0x0/0x40
  ... acquired at:
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
   _raw_read_lock_irqsave+0x74/0x90 kernel/locking/spinlock.c:236
   send_sigio+0x31/0x3e0 fs/fcntl.c:905
   kill_fasync_rcu fs/fcntl.c:1131 [inline]
   kill_fasync fs/fcntl.c:1146 [inline]
   kill_fasync+0x214/0x510 fs/fcntl.c:1139
   sock_wake_async+0x132/0x160 net/socket.c:1509
   sk_wake_async include/net/sock.h:2539 [inline]
   sk_wake_async include/net/sock.h:2535 [inline]
   unix_release_sock+0xc3a/0x1530 net/unix/af_unix.c:712
   unix_release+0x91/0xf0 net/unix/af_unix.c:1196
   __sock_release+0xb3/0x270 net/socket.c:662
   sock_close+0x1c/0x30 net/socket.c:1455
   __fput+0x402/0xb70 fs/file_table.c:468
   task_work_run+0x150/0x240 kernel/task_work.c:227
   resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
   exit_to_user_mode_loop+0xec/0x130 kernel/entry/common.c:43
   exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
   syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
   syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
   do_syscall_64+0x426/0xfa0 arch/x86/entry/syscall_64.c:100
   entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> (&new->fa_lock){....}-{3:3} {
   INITIAL USE at:
                   lock_acquire kernel/locking/lockdep.c:5868 [inline]
                   lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
                   _raw_write_lock_irq+0x36/0x50 kernel/locking/spinlock.c:326
                   fasync_remove_entry+0xb2/0x1e0 fs/fcntl.c:999
                   fasync_helper+0xaf/0xd0 fs/fcntl.c:1102
                   fuse_dev_fasync+0xad/0x100 fs/fuse/dev.c:2571
                   __fput+0x96b/0xb70 fs/file_table.c:465
                   task_work_run+0x150/0x240 kernel/task_work.c:227
                   resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
                   exit_to_user_mode_loop+0xec/0x130 kernel/entry/common.c:43
                   exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
                   syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
                   syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
                   do_syscall_64+0x426/0xfa0 arch/x86/entry/syscall_64.c:100
                   entry_SYSCALL_64_after_hwframe+0x77/0x7f
   INITIAL READ USE at:
                        lock_acquire kernel/locking/lockdep.c:5868 [inline]
                        lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
                        __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
                        _raw_read_lock_irqsave+0x74/0x90 kernel/locking/spinlock.c:236
                        kill_fasync_rcu fs/fcntl.c:1122 [inline]
                        kill_fasync fs/fcntl.c:1146 [inline]
                        kill_fasync+0x138/0x510 fs/fcntl.c:1139
                        pipe_release+0x191/0x320 fs/pipe.c:739
                        __fput+0x402/0xb70 fs/file_table.c:468
                        task_work_run+0x150/0x240 kernel/task_work.c:227
                        resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
                        exit_to_user_mode_loop+0xec/0x130 kernel/entry/common.c:43
                        exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
                        syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
                        syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
                        do_syscall_64+0x426/0xfa0 arch/x86/entry/syscall_64.c:100
                        entry_SYSCALL_64_after_hwframe+0x77/0x7f
 }
 ... key      at: [<ffffffff9ab3fd60>] __key.0+0x0/0x40
 ... acquired at:
   lock_acquire kernel/locking/lockdep.c:5868 [inline]
   lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
   _raw_read_lock_irqsave+0x74/0x90 kernel/locking/spinlock.c:236
   kill_fasync_rcu fs/fcntl.c:1122 [inline]
   kill_fasync fs/fcntl.c:1146 [inline]
   kill_fasync+0x138/0x510 fs/fcntl.c:1139
   __pass_event drivers/input/evdev.c:240 [inline]
   evdev_pass_values+0x619/0x9b0 drivers/input/evdev.c:278
   evdev_events+0x1bb/0x390 drivers/input/evdev.c:306
   input_pass_values+0x74e/0x880 drivers/input/input.c:128
   input_event_dispose drivers/input/input.c:342 [inline]
   input_handle_event+0xf00/0x14d0 drivers/input/input.c:370
   input_inject_event+0x1e8/0x3b0 drivers/input/input.c:424
   evdev_write+0x457/0x750 drivers/input/evdev.c:528
   vfs_write+0x2a0/0x11d0 fs/read_write.c:684
   ksys_write+0x1f8/0x250 fs/read_write.c:738
   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
   do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
   entry_SYSCALL_64_after_hwframe+0x77/0x7f


stack backtrace:
CPU: 1 UID: 0 PID: 21779 Comm: syz.1.6073 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_bad_irq_dependency kernel/locking/lockdep.c:2616 [inline]
 check_irq_usage+0x7dc/0x920 kernel/locking/lockdep.c:2857
 check_prev_add kernel/locking/lockdep.c:3169 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x1285/0x1c90 kernel/locking/lockdep.c:5237
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
 _raw_read_lock_irqsave+0x74/0x90 kernel/locking/spinlock.c:236
 kill_fasync_rcu fs/fcntl.c:1122 [inline]
 kill_fasync fs/fcntl.c:1146 [inline]
 kill_fasync+0x138/0x510 fs/fcntl.c:1139
 __pass_event drivers/input/evdev.c:240 [inline]
 evdev_pass_values+0x619/0x9b0 drivers/input/evdev.c:278
 evdev_events+0x1bb/0x390 drivers/input/evdev.c:306
 input_pass_values+0x74e/0x880 drivers/input/input.c:128
 input_event_dispose drivers/input/input.c:342 [inline]
 input_handle_event+0xf00/0x14d0 drivers/input/input.c:370
 input_inject_event+0x1e8/0x3b0 drivers/input/input.c:424
 evdev_write+0x457/0x750 drivers/input/evdev.c:528
 vfs_write+0x2a0/0x11d0 fs/read_write.c:684
 ksys_write+0x1f8/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd7d9d8efc9
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:00007fd7dac15038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd7d9fe5fa0 RCX: 00007fd7d9d8efc9
RDX: 0000000000001068 RSI: 0000200000000040 RDI: 0000000000000004
RBP: 00007fd7d9e11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd7d9fe6038 R14: 00007fd7d9fe5fa0 R15: 00007fff382c92a8
 </TASK>