syzbot

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
syzkaller #0 Tainted: G             L     
-----------------------------------------------------
syz.0.3442/18571 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffff88806a722558 (&new->fa_lock){....}-{3:3}, at: kill_fasync_rcu fs/fcntl.c:1135 [inline]
ffff88806a722558 (&new->fa_lock){....}-{3:3}, at: kill_fasync+0x199/0x4d0 fs/fcntl.c:1159

and this task is already holding:
ffff888068a17028 (&client->buffer_lock){..-.}-{3:3}, at: spin_lock include/linux/spinlock.h:342 [inline]
ffff888068a17028 (&client->buffer_lock){..-.}-{3:3}, at: evdev_pass_values+0xcb/0xc00 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+0x106/0x350 kernel/locking/lockdep.c:5868
  __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
  _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158
  spin_lock include/linux/spinlock.h:342 [inline]
  evdev_pass_values+0xcb/0xc00 drivers/input/evdev.c:261
  evdev_events+0x1e6/0x340 drivers/input/evdev.c:306
  input_pass_values+0x288/0x890 drivers/input/input.c:128
  input_event_dispose+0x3e5/0x6b0 drivers/input/input.c:353
  input_event+0x84/0xc0 drivers/input/input.c:396
  hidinput_hid_event+0x142d/0x1ec0 drivers/hid/hid-input.c:1762
  hid_process_event+0x4be/0x620 drivers/hid/hid-core.c:1576
  hid_process_report drivers/hid/hid-core.c:1724 [inline]
  hid_report_raw_event+0xf01/0x1870 drivers/hid/hid-core.c:2095
  __hid_input_report+0x454/0x580 drivers/hid/hid-core.c:2166
  hid_irq_in+0x492/0x710 drivers/hid/usbhid/hid-core.c:286
  __usb_hcd_giveback_urb+0x374/0x530 drivers/usb/core/hcd.c:1655
  dummy_timer+0xac3/0x4b40 drivers/usb/gadget/udc/dummy_hcd.c:2005
  __run_hrtimer kernel/time/hrtimer.c:1930 [inline]
  __hrtimer_run_queues+0x3bc/0xa10 kernel/time/hrtimer.c:1994
  hrtimer_run_softirq+0x17a/0x240 kernel/time/hrtimer.c:2011
  handle_softirqs+0x225/0x840 kernel/softirq.c:622
  __do_softirq kernel/softirq.c:656 [inline]
  invoke_softirq kernel/softirq.c:496 [inline]
  __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
  irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
  instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
  sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061
  asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
  __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:188 [inline]
  _raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:206
  spin_unlock_irq include/linux/spinlock.h:402 [inline]
  filemap_remove_folio+0xf9/0x3a0 mm/filemap.c:259
  truncate_inode_folio+0x5d/0x70 mm/truncate.c:176
  shmem_undo_range+0x3fb/0x15d0 mm/shmem.c:1145
  shmem_truncate_range mm/shmem.c:1277 [inline]
  shmem_evict_inode+0x287/0xb30 mm/shmem.c:1407
  evict+0x624/0xb50 fs/inode.c:841
  __dentry_kill+0x19f/0x680 fs/dcache.c:718
  finish_dput+0xca/0x490 fs/dcache.c:927
  __fput+0x675/0xa50 fs/file_table.c:518
  task_work_run+0x1d9/0x270 kernel/task_work.c:233
  exit_task_work include/linux/task_work.h:40 [inline]
  do_exit+0x73a/0x2360 kernel/exit.c:976
  do_group_exit+0x22d/0x2f0 kernel/exit.c:1119
  get_signal+0x121b/0x12c0 kernel/signal.c:3038
  arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
  __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
  exit_to_user_mode_loop+0xa9/0x6b0 kernel/entry/common.c:98
  __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
  syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
  syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
  do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
  entry_SYSCALL_64_after_hwframe+0x77/0x7f

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

... which became SOFTIRQ-irq-unsafe at:
...
  lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
  __raw_read_lock include/linux/rwlock_api_smp.h:163 [inline]
  _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:232
  __do_wait+0xd9/0x720 kernel/exit.c:1679
  do_wait+0x1e7/0x510 kernel/exit.c:1723
  kernel_wait+0xd6/0x1c0 kernel/exit.c:1899
  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:3314 [inline]
  process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3397
  worker_thread+0xa47/0xfb0 kernel/workqueue.c:3478
  kthread+0x389/0x470 kernel/kthread.c:436
  ret_from_fork+0x514/0xb70 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.0.3442/18571:
 #0: ffff88802cb75110 (&evdev->mutex){+.+.}-{4:4}, at: evdev_write+0x1ae/0x4c0 drivers/input/evdev.c:511
 #1: ffff88801ff84230 (&dev->event_lock#2){..-.}-{3:3}, at: class_spinlock_irqsave_constructor include/linux/spinlock.h:620 [inline]
 #1: ffff88801ff84230 (&dev->event_lock#2){..-.}-{3:3}, at: input_inject_event+0xa4/0x330 drivers/input/input.c:419
 #2: ffffffff8e95c780 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #2: ffffffff8e95c780 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #2: ffffffff8e95c780 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1181 [inline]
 #2: ffffffff8e95c780 (rcu_read_lock){....}-{1:3}, at: input_inject_event+0xb5/0x330 drivers/input/input.c:420
 #3: ffffffff8e95c780 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #3: ffffffff8e95c780 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #3: ffffffff8e95c780 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1181 [inline]
 #3: ffffffff8e95c780 (rcu_read_lock){....}-{1:3}, at: input_pass_values+0x8d/0x890 drivers/input/input.c:119
 #4: ffffffff8e95c780 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #4: ffffffff8e95c780 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #4: ffffffff8e95c780 (rcu_read_lock){....}-{1:3}, at: evdev_events+0x79/0x340 drivers/input/evdev.c:298
 #5: ffff888068a17028 (&client->buffer_lock){..-.}-{3:3}, at: spin_lock include/linux/spinlock.h:342 [inline]
 #5: ffff888068a17028 (&client->buffer_lock){..-.}-{3:3}, at: evdev_pass_values+0xcb/0xc00 drivers/input/evdev.c:261
 #6: ffffffff8e95c780 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #6: ffffffff8e95c780 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #6: ffffffff8e95c780 (rcu_read_lock){....}-{1:3}, at: kill_fasync+0x53/0x4d0 fs/fcntl.c:1158

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
-> (&client->buffer_lock){..-.}-{3:3} {
   IN-SOFTIRQ-W at:
                    lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
                    __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
                    _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158
                    spin_lock include/linux/spinlock.h:342 [inline]
                    evdev_pass_values+0xcb/0xc00 drivers/input/evdev.c:261
                    evdev_events+0x1e6/0x340 drivers/input/evdev.c:306
                    input_pass_values+0x288/0x890 drivers/input/input.c:128
                    input_event_dispose+0x3e5/0x6b0 drivers/input/input.c:353
                    input_event+0x84/0xc0 drivers/input/input.c:396
                    hidinput_hid_event+0x142d/0x1ec0 drivers/hid/hid-input.c:1762
                    hid_process_event+0x4be/0x620 drivers/hid/hid-core.c:1576
                    hid_process_report drivers/hid/hid-core.c:1724 [inline]
                    hid_report_raw_event+0xf01/0x1870 drivers/hid/hid-core.c:2095
                    __hid_input_report+0x454/0x580 drivers/hid/hid-core.c:2166
                    hid_irq_in+0x492/0x710 drivers/hid/usbhid/hid-core.c:286
                    __usb_hcd_giveback_urb+0x374/0x530 drivers/usb/core/hcd.c:1655
                    dummy_timer+0xac3/0x4b40 drivers/usb/gadget/udc/dummy_hcd.c:2005
                    __run_hrtimer kernel/time/hrtimer.c:1930 [inline]
                    __hrtimer_run_queues+0x3bc/0xa10 kernel/time/hrtimer.c:1994
                    hrtimer_run_softirq+0x17a/0x240 kernel/time/hrtimer.c:2011
                    handle_softirqs+0x225/0x840 kernel/softirq.c:622
                    __do_softirq kernel/softirq.c:656 [inline]
                    invoke_softirq kernel/softirq.c:496 [inline]
                    __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
                    irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
                    instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
                    sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061
                    asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
                    __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:188 [inline]
                    _raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:206
                    spin_unlock_irq include/linux/spinlock.h:402 [inline]
                    filemap_remove_folio+0xf9/0x3a0 mm/filemap.c:259
                    truncate_inode_folio+0x5d/0x70 mm/truncate.c:176
                    shmem_undo_range+0x3fb/0x15d0 mm/shmem.c:1145
                    shmem_truncate_range mm/shmem.c:1277 [inline]
                    shmem_evict_inode+0x287/0xb30 mm/shmem.c:1407
                    evict+0x624/0xb50 fs/inode.c:841
                    __dentry_kill+0x19f/0x680 fs/dcache.c:718
                    finish_dput+0xca/0x490 fs/dcache.c:927
                    __fput+0x675/0xa50 fs/file_table.c:518
                    task_work_run+0x1d9/0x270 kernel/task_work.c:233
                    exit_task_work include/linux/task_work.h:40 [inline]
                    do_exit+0x73a/0x2360 kernel/exit.c:976
                    do_group_exit+0x22d/0x2f0 kernel/exit.c:1119
                    get_signal+0x121b/0x12c0 kernel/signal.c:3038
                    arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
                    __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
                    exit_to_user_mode_loop+0xa9/0x6b0 kernel/entry/common.c:98
                    __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
                    syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
                    syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
                    do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
                    entry_SYSCALL_64_after_hwframe+0x77/0x7f
   INITIAL USE at:
                   lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
                   __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
                   _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158
                   spin_lock include/linux/spinlock.h:342 [inline]
                   evdev_pass_values+0xcb/0xc00 drivers/input/evdev.c:261
                   evdev_events+0x1e6/0x340 drivers/input/evdev.c:306
                   input_pass_values+0x288/0x890 drivers/input/input.c:128
                   input_event_dispose+0x3e5/0x6b0 drivers/input/input.c:353
                   input_event+0x84/0xc0 drivers/input/input.c:396
                   hidinput_hid_event+0x142d/0x1ec0 drivers/hid/hid-input.c:1762
                   hid_process_event+0x4be/0x620 drivers/hid/hid-core.c:1576
                   hid_process_report drivers/hid/hid-core.c:1724 [inline]
                   hid_report_raw_event+0xf01/0x1870 drivers/hid/hid-core.c:2095
                   __hid_input_report+0x454/0x580 drivers/hid/hid-core.c:2166
                   hid_irq_in+0x492/0x710 drivers/hid/usbhid/hid-core.c:286
                   __usb_hcd_giveback_urb+0x374/0x530 drivers/usb/core/hcd.c:1655
                   dummy_timer+0xac3/0x4b40 drivers/usb/gadget/udc/dummy_hcd.c:2005
                   __run_hrtimer kernel/time/hrtimer.c:1930 [inline]
                   __hrtimer_run_queues+0x3bc/0xa10 kernel/time/hrtimer.c:1994
                   hrtimer_run_softirq+0x17a/0x240 kernel/time/hrtimer.c:2011
                   handle_softirqs+0x225/0x840 kernel/softirq.c:622
                   __do_softirq kernel/softirq.c:656 [inline]
                   invoke_softirq kernel/softirq.c:496 [inline]
                   __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
                   irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
                   instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
                   sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061
                   asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
                   __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:188 [inline]
                   _raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:206
                   spin_unlock_irq include/linux/spinlock.h:402 [inline]
                   filemap_remove_folio+0xf9/0x3a0 mm/filemap.c:259
                   truncate_inode_folio+0x5d/0x70 mm/truncate.c:176
                   shmem_undo_range+0x3fb/0x15d0 mm/shmem.c:1145
                   shmem_truncate_range mm/shmem.c:1277 [inline]
                   shmem_evict_inode+0x287/0xb30 mm/shmem.c:1407
                   evict+0x624/0xb50 fs/inode.c:841
                   __dentry_kill+0x19f/0x680 fs/dcache.c:718
                   finish_dput+0xca/0x490 fs/dcache.c:927
                   __fput+0x675/0xa50 fs/file_table.c:518
                   task_work_run+0x1d9/0x270 kernel/task_work.c:233
                   exit_task_work include/linux/task_work.h:40 [inline]
                   do_exit+0x73a/0x2360 kernel/exit.c:976
                   do_group_exit+0x22d/0x2f0 kernel/exit.c:1119
                   get_signal+0x121b/0x12c0 kernel/signal.c:3038
                   arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
                   __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
                   exit_to_user_mode_loop+0xa9/0x6b0 kernel/entry/common.c:98
                   __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
                   syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
                   syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
                   do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
                   entry_SYSCALL_64_after_hwframe+0x77/0x7f
 }
 ... key      at: [<ffffffff9a7b1840>] evdev_open.__key.27+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+0x106/0x350 kernel/locking/lockdep.c:5868
                        __raw_read_lock include/linux/rwlock_api_smp.h:163 [inline]
                        _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:232
                        __do_wait+0xd9/0x720 kernel/exit.c:1679
                        do_wait+0x1e7/0x510 kernel/exit.c:1723
                        kernel_wait+0xd6/0x1c0 kernel/exit.c:1899
                        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:3314 [inline]
                        process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3397
                        worker_thread+0xa47/0xfb0 kernel/workqueue.c:3478
                        kthread+0x389/0x470 kernel/kthread.c:436
                        ret_from_fork+0x514/0xb70 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+0x106/0x350 kernel/locking/lockdep.c:5868
                        __raw_read_lock include/linux/rwlock_api_smp.h:163 [inline]
                        _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:232
                        __do_wait+0xd9/0x720 kernel/exit.c:1679
                        do_wait+0x1e7/0x510 kernel/exit.c:1723
                        kernel_wait+0xd6/0x1c0 kernel/exit.c:1899
                        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:3314 [inline]
                        process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3397
                        worker_thread+0xa47/0xfb0 kernel/workqueue.c:3478
                        kthread+0x389/0x470 kernel/kthread.c:436
                        ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
                        ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
     INITIAL USE at:
                       lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
                       __raw_write_lock_irq include/linux/rwlock_api_smp.h:213 [inline]
                       _raw_write_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:330
                       copy_process+0x29eb/0x4380 kernel/fork.c:2411
                       kernel_clone+0x2d7/0x940 kernel/fork.c:2722
                       user_mode_thread+0x110/0x180 kernel/fork.c:2798
                       rest_init+0x23/0x300 init/main.c:727
                       start_kernel+0x38a/0x3e0 init/main.c:1220
                       x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
                       x86_64_start_kernel+0x137/0x1b0 arch/x86/kernel/head64.c:291
                       common_startup_64+0x13e/0x147
     INITIAL READ USE at:
                            lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
                            __raw_read_lock include/linux/rwlock_api_smp.h:163 [inline]
                            _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:232
                            __do_wait+0xd9/0x720 kernel/exit.c:1679
                            do_wait+0x1e7/0x510 kernel/exit.c:1723
                            kernel_wait+0xd6/0x1c0 kernel/exit.c:1899
                            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:3314 [inline]
                            process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3397
                            worker_thread+0xa47/0xfb0 kernel/workqueue.c:3478
                            kthread+0x389/0x470 kernel/kthread.c:436
                            ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
                            ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
   }
   ... key      at: [<ffffffff8e60a058>] tasklist_lock+0x18/0x40
   ... acquired at:
   __raw_read_lock include/linux/rwlock_api_smp.h:163 [inline]
   _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:232
   send_sigurg+0x12b/0x420 fs/fcntl.c:978
   sk_send_sigurg+0x6c/0x2e0 net/core/sock.c:3681
   queue_oob+0x42c/0x4f0 net/unix/af_unix.c:2368
   unix_stream_sendmsg+0xc30/0xde0 net/unix/af_unix.c:2502
   sock_sendmsg_nosec net/socket.c:787 [inline]
   __sock_sendmsg net/socket.c:802 [inline]
   ____sys_sendmsg+0x9b9/0xa20 net/socket.c:2699
   ___sys_sendmsg+0x2a5/0x360 net/socket.c:2753
   __sys_sendmsg net/socket.c:2785 [inline]
   __do_sys_sendmsg net/socket.c:2790 [inline]
   __se_sys_sendmsg net/socket.c:2788 [inline]
   __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2788
   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
   do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
   entry_SYSCALL_64_after_hwframe+0x77/0x7f

 -> (&f_owner->lock){....}-{3:3} {
    INITIAL USE at:
                     lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
                     __raw_write_lock_irq include/linux/rwlock_api_smp.h:213 [inline]
                     _raw_write_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:330
                     __f_setown+0x5f/0x380 fs/fcntl.c:136
                     fcntl_dirnotify+0x3fd/0x6a0 fs/notify/dnotify/dnotify.c:369
                     do_fcntl+0x77e/0x1a30 fs/fcntl.c:538
                     __do_sys_fcntl fs/fcntl.c:602 [inline]
                     __se_sys_fcntl+0xc8/0x150 fs/fcntl.c:587
                     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                     do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
                     entry_SYSCALL_64_after_hwframe+0x77/0x7f
    INITIAL READ USE at:
                          lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
                          __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:174 [inline]
                          _raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:240
                          send_sigio+0x38/0x370 fs/fcntl.c:918
                          dnotify_handle_event+0x169/0x440 fs/notify/dnotify/dnotify.c:113
                          fsnotify_handle_event fs/notify/fsnotify.c:327 [inline]
                          send_to_group fs/notify/fsnotify.c:375 [inline]
                          fsnotify+0x18a5/0x1b60 fs/notify/fsnotify.c:592
                          fsnotify_name include/linux/fsnotify.h:55 [inline]
                          fsnotify_dirent include/linux/fsnotify.h:61 [inline]
                          fsnotify_create include/linux/fsnotify.h:323 [inline]
                          open_last_lookups fs/namei.c:4614 [inline]
                          path_openat+0x11aa/0x3890 fs/namei.c:4855
                          do_file_open+0x23e/0x4a0 fs/namei.c:4887
                          do_sys_openat2+0x113/0x200 fs/open.c:1364
                          do_sys_open fs/open.c:1370 [inline]
                          __do_sys_openat fs/open.c:1386 [inline]
                          __se_sys_openat fs/open.c:1381 [inline]
                          __x64_sys_openat+0x138/0x170 fs/open.c:1381
                          do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                          do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
                          entry_SYSCALL_64_after_hwframe+0x77/0x7f
  }
  ... key      at: [<ffffffff9a493880>] file_f_owner_allocate.__key+0x0/0x20
  ... acquired at:
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:174 [inline]
   _raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:240
   send_sigio+0x38/0x370 fs/fcntl.c:918
   kill_fasync_rcu fs/fcntl.c:1144 [inline]
   kill_fasync+0x24d/0x4d0 fs/fcntl.c:1159
   lease_break_callback+0x26/0x30 fs/locks.c:577
   __break_lease+0x80d/0x1e70 fs/locks.c:1669
   break_deleg include/linux/filelock.h:505 [inline]
   try_break_deleg include/linux/filelock.h:524 [inline]
   vfs_remove_acl+0x225/0x850 fs/posix_acl.c:1237
   removexattr fs/xattr.c:1027 [inline]
   file_removexattr fs/xattr.c:1037 [inline]
   path_removexattrat+0x4cd/0x760 fs/xattr.c:1086
   __do_sys_fremovexattr fs/xattr.c:1112 [inline]
   __se_sys_fremovexattr fs/xattr.c:1110 [inline]
   __x64_sys_fremovexattr+0x62/0x70 fs/xattr.c:1110
   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
   do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
   entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> (&new->fa_lock){....}-{3:3} {
   INITIAL USE at:
                   lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:213 [inline]
                   _raw_write_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:330
                   fasync_remove_entry+0xf1/0x1c0 fs/fcntl.c:1012
                   sock_fasync+0x85/0xf0 net/socket.c:1540
                   __fput+0x88d/0xa50 fs/file_table.c:507
                   task_work_run+0x1d9/0x270 kernel/task_work.c:233
                   exit_task_work include/linux/task_work.h:40 [inline]
                   do_exit+0x73a/0x2360 kernel/exit.c:976
                   do_group_exit+0x22d/0x2f0 kernel/exit.c:1119
                   get_signal+0x121b/0x12c0 kernel/signal.c:3038
                   arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
                   __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
                   exit_to_user_mode_loop+0xa9/0x6b0 kernel/entry/common.c:98
                   __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
                   syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
                   syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
                   do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
                   entry_SYSCALL_64_after_hwframe+0x77/0x7f
   INITIAL READ USE at:
                        lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
                        __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:174 [inline]
                        _raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:240
                        kill_fasync_rcu fs/fcntl.c:1135 [inline]
                        kill_fasync+0x199/0x4d0 fs/fcntl.c:1159
                        sock_wake_async+0x132/0x150 net/socket.c:-1
                        sk_wake_async+0x189/0x280 include/net/sock.h:2586
                        tcp_rcv_synsent_state_process net/ipv4/tcp_input.c:6949 [inline]
                        tcp_rcv_state_process+0x2124/0x4980 net/ipv4/tcp_input.c:7164
                        tcp_v4_do_rcv+0x9fd/0x13b0 net/ipv4/tcp_ipv4.c:1873
                        sk_backlog_rcv include/net/sock.h:1192 [inline]
                        __release_sock+0x25b/0x390 net/core/sock.c:3225
                        release_sock+0x190/0x260 net/core/sock.c:3824
                        inet_wait_for_connect net/ipv4/af_inet.c:616 [inline]
                        __inet_stream_connect+0x863/0xe00 net/ipv4/af_inet.c:710
                        tcp_sendmsg_fastopen+0x3af/0x5f0 net/ipv4/tcp.c:1086
                        tcp_sendmsg_locked+0x4cdc/0x55c0 net/ipv4/tcp.c:1182
                        tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1452
                        sock_sendmsg_nosec net/socket.c:788 [inline]
                        __sock_sendmsg net/socket.c:802 [inline]
                        ____sys_sendmsg+0x853/0xa20 net/socket.c:2699
                        ___sys_sendmsg+0x2a5/0x360 net/socket.c:2753
                        __sys_sendmsg net/socket.c:2785 [inline]
                        __do_sys_sendmsg net/socket.c:2790 [inline]
                        __se_sys_sendmsg net/socket.c:2788 [inline]
                        __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2788
                        do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                        do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
                        entry_SYSCALL_64_after_hwframe+0x77/0x7f
 }
 ... key      at: [<ffffffff9a4938a0>] fasync_insert_entry.__key+0x0/0x20
 ... acquired at:
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:174 [inline]
   _raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:240
   kill_fasync_rcu fs/fcntl.c:1135 [inline]
   kill_fasync+0x199/0x4d0 fs/fcntl.c:1159
   __pass_event drivers/input/evdev.c:240 [inline]
   evdev_pass_values+0x552/0xc00 drivers/input/evdev.c:278
   evdev_events+0x1e6/0x340 drivers/input/evdev.c:306
   input_pass_values+0x288/0x890 drivers/input/input.c:128
   input_event_dispose+0x330/0x6b0 drivers/input/input.c:342
   input_inject_event+0x1dd/0x330 drivers/input/input.c:424
   evdev_write+0x325/0x4c0 drivers/input/evdev.c:528
   vfs_write+0x296/0xba0 fs/read_write.c:686
   ksys_write+0x150/0x270 fs/read_write.c:740
   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
   do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
   entry_SYSCALL_64_after_hwframe+0x77/0x7f


stack backtrace:
CPU: 0 UID: 0 PID: 18571 Comm: syz.0.3442 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_bad_irq_dependency kernel/locking/lockdep.c:2616 [inline]
 check_irq_usage kernel/locking/lockdep.c:2857 [inline]
 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+0x2a37/0x2cd0 kernel/locking/lockdep.c:5237
 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:174 [inline]
 _raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:240
 kill_fasync_rcu fs/fcntl.c:1135 [inline]
 kill_fasync+0x199/0x4d0 fs/fcntl.c:1159
 __pass_event drivers/input/evdev.c:240 [inline]
 evdev_pass_values+0x552/0xc00 drivers/input/evdev.c:278
 evdev_events+0x1e6/0x340 drivers/input/evdev.c:306
 input_pass_values+0x288/0x890 drivers/input/input.c:128
 input_event_dispose+0x330/0x6b0 drivers/input/input.c:342
 input_inject_event+0x1dd/0x330 drivers/input/input.c:424
 evdev_write+0x325/0x4c0 drivers/input/evdev.c:528
 vfs_write+0x296/0xba0 fs/read_write.c:686
 ksys_write+0x150/0x270 fs/read_write.c:740
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd40079ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd3fe9f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd400a16090 RCX: 00007fd40079ce59
RDX: 0000000000000037 RSI: 0000200000000040 RDI: 0000000000000003
RBP: 00007fd400832d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd400a16128 R14: 00007fd400a16090 R15: 00007fd400b3fa48
 </TASK>