syzbot

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
6.15.0-rc5-syzkaller-00204-g0e1329d4045c #0 Not tainted
-----------------------------------------------------
syz.5.4158/15972 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffff888011576408 (&new->fa_lock){....}-{3:3}, at: kill_fasync_rcu fs/fcntl.c:1124 [inline]
ffff888011576408 (&new->fa_lock){....}-{3:3}, at: kill_fasync+0x199/0x4d0 fs/fcntl.c:1148

and this task is already holding:
ffff888028141028 (&client->buffer_lock){..-.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
ffff888028141028 (&client->buffer_lock){..-.}-{3:3}, at: evdev_pass_values+0xb9/0xbd0 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+0x120/0x360 kernel/locking/lockdep.c:5866
  __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+0xb9/0xbd0 drivers/input/evdev.c:261
  evdev_events+0x1e6/0x340 drivers/input/evdev.c:306
  input_pass_values+0x285/0x890 drivers/input/input.c:127
  input_event_dispose+0x3e5/0x6b0 drivers/input/input.c:352
  input_event+0x8c/0xc0 drivers/input/input.c:395
  hidinput_hid_event+0x132c/0x1c90 drivers/hid/hid-input.c:1716
  hid_process_event+0x4be/0x620 drivers/hid/hid-core.c:1552
  hid_process_report drivers/hid/hid-core.c:1700 [inline]
  hid_report_raw_event+0xe91/0x16d0 drivers/hid/hid-core.c:2052
  __hid_input_report drivers/hid/hid-core.c:2122 [inline]
  hid_input_report+0x43e/0x520 drivers/hid/hid-core.c:2144
  hid_irq_in+0x47e/0x6d0 drivers/hid/usbhid/hid-core.c:286
  __usb_hcd_giveback_urb+0x417/0x690 drivers/usb/core/hcd.c:1650
  dummy_timer+0x862/0x4550 drivers/usb/gadget/udc/dummy_hcd.c:1994
  __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
  __hrtimer_run_queues+0x529/0xc60 kernel/time/hrtimer.c:1825
  hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1842
  handle_softirqs+0x283/0x870 kernel/softirq.c:579
  __do_softirq kernel/softirq.c:613 [inline]
  invoke_softirq kernel/softirq.c:453 [inline]
  __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
  irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
  instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
  sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
  asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
  arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
  raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
  rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
  rcu_is_watching+0x5a/0xb0 kernel/rcu/tree.c:736
  trace_lock_acquire include/trace/events/lock.h:24 [inline]
  lock_acquire+0x5f/0x360 kernel/locking/lockdep.c:5829
  rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
  rcu_read_lock include/linux/rcupdate.h:841 [inline]
  batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
  batadv_nc_worker+0xef/0x610 net/batman-adv/network-coding.c:719
  process_one_work kernel/workqueue.c:3238 [inline]
  process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
  worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
  kthread+0x70e/0x8a0 kernel/kthread.c:464
  ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

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

... which became SOFTIRQ-irq-unsafe at:
...
  lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
  __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
  _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
  __do_wait+0xde/0x740 kernel/exit.c:1662
  do_wait+0x1f8/0x520 kernel/exit.c:1706
  kernel_wait+0xab/0x170 kernel/exit.c:1882
  call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
  call_usermodehelper_exec_work+0xbe/0x230 kernel/umh.c:163
  process_one_work kernel/workqueue.c:3238 [inline]
  process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
  worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
  kthread+0x70e/0x8a0 kernel/kthread.c:464
  ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
  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.5.4158/15972:
 #0: ffff8881463e1118 (&evdev->mutex){+.+.}-{4:4}, at: evdev_write+0x1a1/0x480 drivers/input/evdev.c:511
 #1: ffff88801fb28230 (&dev->event_lock#2){..-.}-{3:3}, at: class_spinlock_irqsave_constructor include/linux/spinlock.h:585 [inline]
 #1: ffff88801fb28230 (&dev->event_lock#2){..-.}-{3:3}, at: input_inject_event+0xab/0x320 drivers/input/input.c:418
 #2: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #2: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #2: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
 #2: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: input_inject_event+0xbc/0x320 drivers/input/input.c:419
 #3: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #3: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #3: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
 #3: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: input_pass_values+0x8d/0x890 drivers/input/input.c:118
 #4: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #4: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #4: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: evdev_events+0x79/0x340 drivers/input/evdev.c:298
 #5: ffff888028141028 (&client->buffer_lock){..-.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #5: ffff888028141028 (&client->buffer_lock){..-.}-{3:3}, at: evdev_pass_values+0xb9/0xbd0 drivers/input/evdev.c:261
 #6: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #6: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #6: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: kill_fasync+0x53/0x4d0 fs/fcntl.c:1147

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
-> (&client->buffer_lock){..-.}-{3:3} {
   IN-SOFTIRQ-W at:
                    lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
                    __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+0xb9/0xbd0 drivers/input/evdev.c:261
                    evdev_events+0x1e6/0x340 drivers/input/evdev.c:306
                    input_pass_values+0x285/0x890 drivers/input/input.c:127
                    input_event_dispose+0x3e5/0x6b0 drivers/input/input.c:352
                    input_event+0x8c/0xc0 drivers/input/input.c:395
                    hidinput_hid_event+0x132c/0x1c90 drivers/hid/hid-input.c:1716
                    hid_process_event+0x4be/0x620 drivers/hid/hid-core.c:1552
                    hid_process_report drivers/hid/hid-core.c:1700 [inline]
                    hid_report_raw_event+0xe91/0x16d0 drivers/hid/hid-core.c:2052
                    __hid_input_report drivers/hid/hid-core.c:2122 [inline]
                    hid_input_report+0x43e/0x520 drivers/hid/hid-core.c:2144
                    hid_irq_in+0x47e/0x6d0 drivers/hid/usbhid/hid-core.c:286
                    __usb_hcd_giveback_urb+0x417/0x690 drivers/usb/core/hcd.c:1650
                    dummy_timer+0x862/0x4550 drivers/usb/gadget/udc/dummy_hcd.c:1994
                    __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
                    __hrtimer_run_queues+0x529/0xc60 kernel/time/hrtimer.c:1825
                    hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1842
                    handle_softirqs+0x283/0x870 kernel/softirq.c:579
                    __do_softirq kernel/softirq.c:613 [inline]
                    invoke_softirq kernel/softirq.c:453 [inline]
                    __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
                    irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
                    instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
                    sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
                    asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
                    arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
                    raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
                    rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
                    rcu_is_watching+0x5a/0xb0 kernel/rcu/tree.c:736
                    trace_lock_acquire include/trace/events/lock.h:24 [inline]
                    lock_acquire+0x5f/0x360 kernel/locking/lockdep.c:5829
                    rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
                    rcu_read_lock include/linux/rcupdate.h:841 [inline]
                    batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
                    batadv_nc_worker+0xef/0x610 net/batman-adv/network-coding.c:719
                    process_one_work kernel/workqueue.c:3238 [inline]
                    process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
                    worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
                    kthread+0x70e/0x8a0 kernel/kthread.c:464
                    ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
                    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
   INITIAL USE at:
                   lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
                   __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+0xb9/0xbd0 drivers/input/evdev.c:261
                   evdev_events+0x1e6/0x340 drivers/input/evdev.c:306
                   input_pass_values+0x285/0x890 drivers/input/input.c:127
                   input_event_dispose+0x330/0x6b0 drivers/input/input.c:341
                   input_inject_event+0x1fe/0x320 drivers/input/input.c:423
                   evdev_write+0x2fc/0x480 drivers/input/evdev.c:528
                   vfs_write+0x27b/0xa90 fs/read_write.c:682
                   ksys_write+0x145/0x250 fs/read_write.c:736
                   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                   do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
                   entry_SYSCALL_64_after_hwframe+0x77/0x7f
 }
 ... key      at: [<ffffffff99b535c0>] evdev_open.__key.25+0x0/0x20

the dependencies between the lock to be acquired
 and SOFTIRQ-irq-unsafe lock:
  -> (tasklist_lock){.+.+}-{3:3} {
     HARDIRQ-ON-R at:
                        lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
                        __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
                        _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
                        __do_wait+0xde/0x740 kernel/exit.c:1662
                        do_wait+0x1f8/0x520 kernel/exit.c:1706
                        kernel_wait+0xab/0x170 kernel/exit.c:1882
                        call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
                        call_usermodehelper_exec_work+0xbe/0x230 kernel/umh.c:163
                        process_one_work kernel/workqueue.c:3238 [inline]
                        process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
                        worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
                        kthread+0x70e/0x8a0 kernel/kthread.c:464
                        ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
                        ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
     SOFTIRQ-ON-R at:
                        lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
                        __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
                        _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
                        __do_wait+0xde/0x740 kernel/exit.c:1662
                        do_wait+0x1f8/0x520 kernel/exit.c:1706
                        kernel_wait+0xab/0x170 kernel/exit.c:1882
                        call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
                        call_usermodehelper_exec_work+0xbe/0x230 kernel/umh.c:163
                        process_one_work kernel/workqueue.c:3238 [inline]
                        process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
                        worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
                        kthread+0x70e/0x8a0 kernel/kthread.c:464
                        ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
                        ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
     INITIAL USE at:
                       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
                       __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
                       _raw_write_lock_irq+0xa2/0xf0 kernel/locking/spinlock.c:326
                       copy_process+0x21d5/0x3b80 kernel/fork.c:2560
                       kernel_clone+0x224/0x7f0 kernel/fork.c:2844
                       user_mode_thread+0xdd/0x140 kernel/fork.c:2922
                       rest_init+0x23/0x300 init/main.c:708
                       start_kernel+0x470/0x4f0 init/main.c:1099
                       x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:513
                       x86_64_start_kernel+0x66/0x70 arch/x86/kernel/head64.c:494
                       common_startup_64+0x13e/0x147
     INITIAL READ USE at:
                            lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
                            __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
                            _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
                            __do_wait+0xde/0x740 kernel/exit.c:1662
                            do_wait+0x1f8/0x520 kernel/exit.c:1706
                            kernel_wait+0xab/0x170 kernel/exit.c:1882
                            call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
                            call_usermodehelper_exec_work+0xbe/0x230 kernel/umh.c:163
                            process_one_work kernel/workqueue.c:3238 [inline]
                            process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
                            worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
                            kthread+0x70e/0x8a0 kernel/kthread.c:464
                            ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
                            ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
   }
   ... key      at: [<ffffffff8dc0c058>] tasklist_lock+0x18/0x40
   ... acquired at:
   lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
   __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
   _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
   send_sigurg+0x12b/0x420 fs/fcntl.c:967
   sk_send_sigurg+0x6c/0x2e0 net/core/sock.c:3591
   queue_oob+0x3d9/0x4e0 net/unix/af_unix.c:2217
   unix_stream_sendmsg+0xa41/0xb60 net/unix/af_unix.c:2335
   sock_sendmsg_nosec net/socket.c:712 [inline]
   __sock_sendmsg+0x219/0x270 net/socket.c:727
   ____sys_sendmsg+0x52d/0x830 net/socket.c:2566
   ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620
   __sys_sendmmsg+0x227/0x430 net/socket.c:2709
   __do_sys_sendmmsg net/socket.c:2736 [inline]
   __se_sys_sendmmsg net/socket.c:2733 [inline]
   __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2733
   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
   do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
   entry_SYSCALL_64_after_hwframe+0x77/0x7f

 -> (&f_owner->lock){....}-{3:3} {
    INITIAL USE at:
                     lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
                     __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
                     _raw_write_lock_irq+0xa2/0xf0 kernel/locking/spinlock.c:326
                     __f_setown+0x67/0x370 fs/fcntl.c:136
                     fcntl_dirnotify+0x3d6/0x690 fs/notify/dnotify/dnotify.c:369
                     do_fcntl+0x6c7/0x1910 fs/fcntl.c:539
                     __do_sys_fcntl fs/fcntl.c:591 [inline]
                     __se_sys_fcntl+0xc8/0x150 fs/fcntl.c:576
                     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                     do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
                     entry_SYSCALL_64_after_hwframe+0x77/0x7f
    INITIAL READ USE at:
                          lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
                          __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
                          _raw_read_lock_irqsave+0xaf/0x100 kernel/locking/spinlock.c:236
                          send_sigio+0x38/0x370 fs/fcntl.c:907
                          dnotify_handle_event+0x169/0x440 fs/notify/dnotify/dnotify.c:113
                          fsnotify_handle_event fs/notify/fsnotify.c:350 [inline]
                          send_to_group fs/notify/fsnotify.c:424 [inline]
                          fsnotify+0x1671/0x1a80 fs/notify/fsnotify.c:641
                          __fsnotify_parent+0x3fe/0x540 fs/notify/fsnotify.c:287
                          notify_change+0xb70/0xe40 fs/attr.c:557
                          vfs_utimes+0x3fb/0x570 fs/utimes.c:66
                          do_utimes_path fs/utimes.c:99 [inline]
                          do_utimes+0x1b9/0x2a0 fs/utimes.c:140
                          __do_sys_utimensat fs/utimes.c:159 [inline]
                          __se_sys_utimensat fs/utimes.c:143 [inline]
                          __x64_sys_utimensat+0x14f/0x230 fs/utimes.c:143
                          do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                          do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
                          entry_SYSCALL_64_after_hwframe+0x77/0x7f
  }
  ... key      at: [<ffffffff99844c80>] file_f_owner_allocate.__key+0x0/0x20
  ... acquired at:
   lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
   _raw_read_lock_irqsave+0xaf/0x100 kernel/locking/spinlock.c:236
   send_sigio+0x38/0x370 fs/fcntl.c:907
   kill_fasync_rcu fs/fcntl.c:1133 [inline]
   kill_fasync+0x24d/0x4d0 fs/fcntl.c:1148
   lease_break_callback+0x26/0x30 fs/locks.c:558
   __break_lease+0x6a2/0x1620 fs/locks.c:1592
   break_lease include/linux/filelock.h:441 [inline]
   do_dentry_open+0xd62/0x1970 fs/open.c:947
   vfs_open+0x3b/0x340 fs/open.c:1086
   do_open fs/namei.c:3880 [inline]
   path_openat+0x2ee5/0x3830 fs/namei.c:4039
   do_filp_open+0x1fa/0x410 fs/namei.c:4066
   do_sys_openat2+0x121/0x1c0 fs/open.c:1429
   do_sys_open fs/open.c:1444 [inline]
   __do_sys_open fs/open.c:1452 [inline]
   __se_sys_open fs/open.c:1448 [inline]
   __x64_sys_open+0x11e/0x150 fs/open.c:1448
   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
   do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
   entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> (&new->fa_lock){....}-{3:3} {
   INITIAL USE at:
                   lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
                   _raw_write_lock_irq+0xa2/0xf0 kernel/locking/spinlock.c:326
                   fasync_remove_entry+0xf1/0x1c0 fs/fcntl.c:1001
                   sock_fasync+0x85/0xf0 net/socket.c:1416
                   __fput+0x89f/0xa70 fs/file_table.c:462
                   task_work_run+0x1d1/0x260 kernel/task_work.c:227
                   resume_user_mode_work+0x5e/0x80 include/linux/resume_user_mode.h:50
                   exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
                   exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
                   __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
                   syscall_exit_to_user_mode+0x9a/0x120 kernel/entry/common.c:218
                   do_syscall_64+0x103/0x210 arch/x86/entry/syscall_64.c:100
                   entry_SYSCALL_64_after_hwframe+0x77/0x7f
   INITIAL READ USE at:
                        lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
                        __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
                        _raw_read_lock_irqsave+0xaf/0x100 kernel/locking/spinlock.c:236
                        kill_fasync_rcu fs/fcntl.c:1124 [inline]
                        kill_fasync+0x199/0x4d0 fs/fcntl.c:1148
                        sock_wake_async+0x137/0x160 net/socket.c:-1
                        sk_wake_async_rcu include/net/sock.h:2505 [inline]
                        sock_def_error_report+0x332/0x390 net/core/sock.c:3520
                        sk_error_report+0x45/0x290 net/core/sock.c:346
                        unix_dgram_disconnected net/unix/af_unix.c:627 [inline]
                        unix_dgram_connect+0x9fd/0xd30 net/unix/af_unix.c:1478
                        __sys_connect_file net/socket.c:2038 [inline]
                        __sys_connect+0x313/0x440 net/socket.c:2057
                        __do_sys_connect net/socket.c:2063 [inline]
                        __se_sys_connect net/socket.c:2060 [inline]
                        __x64_sys_connect+0x7a/0x90 net/socket.c:2060
                        do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                        do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
                        entry_SYSCALL_64_after_hwframe+0x77/0x7f
 }
 ... key      at: [<ffffffff99844ca0>] fasync_insert_entry.__key+0x0/0x20
 ... acquired at:
   lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
   _raw_read_lock_irqsave+0xaf/0x100 kernel/locking/spinlock.c:236
   kill_fasync_rcu fs/fcntl.c:1124 [inline]
   kill_fasync+0x199/0x4d0 fs/fcntl.c:1148
   __pass_event drivers/input/evdev.c:240 [inline]
   evdev_pass_values+0x627/0xbd0 drivers/input/evdev.c:278
   evdev_events+0x1e6/0x340 drivers/input/evdev.c:306
   input_pass_values+0x285/0x890 drivers/input/input.c:127
   input_event_dispose+0x330/0x6b0 drivers/input/input.c:341
   input_inject_event+0x1fe/0x320 drivers/input/input.c:423
   evdev_write+0x2fc/0x480 drivers/input/evdev.c:528
   vfs_write+0x27b/0xa90 fs/read_write.c:682
   ksys_write+0x145/0x250 fs/read_write.c:736
   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
   do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
   entry_SYSCALL_64_after_hwframe+0x77/0x7f


stack backtrace:
CPU: 0 UID: 0 PID: 15972 Comm: syz.5.4158 Not tainted 6.15.0-rc5-syzkaller-00204-g0e1329d4045c #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_bad_irq_dependency kernel/locking/lockdep.c:2652 [inline]
 check_irq_usage kernel/locking/lockdep.c:2893 [inline]
 check_prev_add kernel/locking/lockdep.c:3170 [inline]
 check_prevs_add kernel/locking/lockdep.c:3285 [inline]
 validate_chain+0x1f05/0x2140 kernel/locking/lockdep.c:3909
 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
 _raw_read_lock_irqsave+0xaf/0x100 kernel/locking/spinlock.c:236
 kill_fasync_rcu fs/fcntl.c:1124 [inline]
 kill_fasync+0x199/0x4d0 fs/fcntl.c:1148
 __pass_event drivers/input/evdev.c:240 [inline]
 evdev_pass_values+0x627/0xbd0 drivers/input/evdev.c:278
 evdev_events+0x1e6/0x340 drivers/input/evdev.c:306
 input_pass_values+0x285/0x890 drivers/input/input.c:127
 input_event_dispose+0x330/0x6b0 drivers/input/input.c:341
 input_inject_event+0x1fe/0x320 drivers/input/input.c:423
 evdev_write+0x2fc/0x480 drivers/input/evdev.c:528
 vfs_write+0x27b/0xa90 fs/read_write.c:682
 ksys_write+0x145/0x250 fs/read_write.c:736
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f723c78e969
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:00007f723d5bf038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f723c9b5fa0 RCX: 00007f723c78e969
RDX: 0000000000001068 RSI: 0000200000000040 RDI: 0000000000000004
RBP: 00007f723c810ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f723c9b5fa0 R15: 00007ffe43f737c8
 </TASK>