syzbot

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
syzkaller #0 Tainted: G             L     
-----------------------------------------------------
syz.3.11129/14749 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffff888047462c90 (&new->fa_lock){....}-{3:3}, at: kill_fasync_rcu fs/fcntl.c:1135 [inline]
ffff888047462c90 (&new->fa_lock){....}-{3:3}, at: kill_fasync fs/fcntl.c:1159 [inline]
ffff888047462c90 (&new->fa_lock){....}-{3:3}, at: kill_fasync+0x138/0x510 fs/fcntl.c:1152

and this task is already holding:
ffff888059676028 (&client->buffer_lock){..-.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
ffff888059676028 (&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+0x179/0x330 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/0x2470 drivers/hid/hid-input.c:1747
  hid_process_event+0x4b7/0x5e0 drivers/hid/hid-core.c:1565
  hid_input_array_field+0x51a/0x700 drivers/hid/hid-core.c:1677
  hid_process_report drivers/hid/hid-core.c:1719 [inline]
  hid_report_raw_event+0xac8/0x12c0 drivers/hid/hid-core.c:2074
  __hid_input_report.constprop.0+0x33f/0x470 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+0x1809/0x3ad0 drivers/usb/gadget/udc/dummy_hcd.c:1995
  __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
  __hrtimer_run_queues+0x202/0xc40 kernel/time/hrtimer.c:1841
  hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858
  handle_softirqs+0x219/0x950 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:1056 [inline]
  sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1056
  asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
  __sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:213
  kernfs_root+0x94/0x2a0 fs/kernfs/kernfs-internal.h:77
  kernfs_link_sibling+0x537/0x770 fs/kernfs/dir.c:398
  kernfs_add_one+0x20a/0x840 fs/kernfs/dir.c:813
  __kernfs_create_file+0x295/0x350 fs/kernfs/file.c:1086
  sysfs_add_file_mode_ns+0x207/0x3c0 fs/sysfs/file.c:313
  create_files fs/sysfs/group.c:82 [inline]
  internal_create_group+0x597/0xf70 fs/sysfs/group.c:189
  internal_create_groups+0x9d/0x150 fs/sysfs/group.c:229
  device_add_groups drivers/base/core.c:2836 [inline]
  device_add_attrs drivers/base/core.c:2911 [inline]
  device_add+0x7a5/0x1980 drivers/base/core.c:3643
  usb_create_ep_devs+0x160/0x2b0 drivers/usb/core/endpoint.c:170
  create_intf_ep_devs.isra.0+0x161/0x200 drivers/usb/core/message.c:1252
  usb_set_configuration+0x11a7/0x1e50 drivers/usb/core/message.c:2216
  usb_generic_driver_probe+0xb1/0x110 drivers/usb/core/generic.c:250
  usb_probe_device+0xef/0x400 drivers/usb/core/driver.c:291
  call_driver_probe drivers/base/dd.c:581 [inline]
  really_probe+0x241/0xb20 drivers/base/dd.c:659
  __driver_probe_device+0x1de/0x470 drivers/base/dd.c:801
  driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831
  __device_attach_driver+0x1df/0x350 drivers/base/dd.c:959
  bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
  __device_attach+0x1e4/0x4e0 drivers/base/dd.c:1031
  device_initial_probe+0xaa/0xc0 drivers/base/dd.c:1086
  bus_probe_device+0x64/0x150 drivers/base/bus.c:574
  device_add+0x116e/0x1980 drivers/base/core.c:3689
  usb_new_device+0xd07/0x1a90 drivers/usb/core/hub.c:2695
  hub_port_connect drivers/usb/core/hub.c:5567 [inline]
  hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
  port_event drivers/usb/core/hub.c:5871 [inline]
  hub_event+0x313a/0x52f0 drivers/usb/core/hub.c:5953
  process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
  process_scheduled_works kernel/workqueue.c:3340 [inline]
  worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
  kthread+0x3c5/0x780 kernel/kthread.c:463
  ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

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+0x179/0x330 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:1672
  do_wait+0x21d/0x570 kernel/exit.c:1716
  kernel_wait+0x9f/0x160 kernel/exit.c:1892
  call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
  call_usermodehelper_exec_work+0xf1/0x170 kernel/umh.c:163
  process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
  process_scheduled_works kernel/workqueue.c:3340 [inline]
  worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
  kthread+0x3c5/0x780 kernel/kthread.c:463
  ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

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.3.11129/14749:
 #0: ffff8881463b1118 (&evdev->mutex){+.+.}-{4:4}, at: evdev_write+0x206/0x750 drivers/input/evdev.c:511
 #1: ffff88801db59230 (&dev->event_lock#2){..-.}-{3:3}, at: class_spinlock_irqsave_constructor include/linux/spinlock.h:585 [inline]
 #1: ffff88801db59230 (&dev->event_lock#2){..-.}-{3:3}, at: input_inject_event+0x9f/0x3b0 drivers/input/input.c:419
 #2: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #2: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
 #2: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
 #2: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: input_inject_event+0xbb/0x3b0 drivers/input/input.c:420
 #3: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #3: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
 #3: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
 #3: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: input_pass_values+0x80/0x880 drivers/input/input.c:119
 #4: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #4: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
 #4: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: evdev_events+0x7b/0x390 drivers/input/evdev.c:298
 #5: ffff888059676028 (&client->buffer_lock){..-.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #5: ffff888059676028 (&client->buffer_lock){..-.}-{3:3}, at: evdev_pass_values+0x10e/0x9b0 drivers/input/evdev.c:261
 #6: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #6: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
 #6: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: kill_fasync fs/fcntl.c:1158 [inline]
 #6: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: kill_fasync+0x62/0x510 fs/fcntl.c:1152

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+0x179/0x330 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/0x2470 drivers/hid/hid-input.c:1747
                    hid_process_event+0x4b7/0x5e0 drivers/hid/hid-core.c:1565
                    hid_input_array_field+0x51a/0x700 drivers/hid/hid-core.c:1677
                    hid_process_report drivers/hid/hid-core.c:1719 [inline]
                    hid_report_raw_event+0xac8/0x12c0 drivers/hid/hid-core.c:2074
                    __hid_input_report.constprop.0+0x33f/0x470 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+0x1809/0x3ad0 drivers/usb/gadget/udc/dummy_hcd.c:1995
                    __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
                    __hrtimer_run_queues+0x202/0xc40 kernel/time/hrtimer.c:1841
                    hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858
                    handle_softirqs+0x219/0x950 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:1056 [inline]
                    sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1056
                    asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
                    __sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:213
                    kernfs_root+0x94/0x2a0 fs/kernfs/kernfs-internal.h:77
                    kernfs_link_sibling+0x537/0x770 fs/kernfs/dir.c:398
                    kernfs_add_one+0x20a/0x840 fs/kernfs/dir.c:813
                    __kernfs_create_file+0x295/0x350 fs/kernfs/file.c:1086
                    sysfs_add_file_mode_ns+0x207/0x3c0 fs/sysfs/file.c:313
                    create_files fs/sysfs/group.c:82 [inline]
                    internal_create_group+0x597/0xf70 fs/sysfs/group.c:189
                    internal_create_groups+0x9d/0x150 fs/sysfs/group.c:229
                    device_add_groups drivers/base/core.c:2836 [inline]
                    device_add_attrs drivers/base/core.c:2911 [inline]
                    device_add+0x7a5/0x1980 drivers/base/core.c:3643
                    usb_create_ep_devs+0x160/0x2b0 drivers/usb/core/endpoint.c:170
                    create_intf_ep_devs.isra.0+0x161/0x200 drivers/usb/core/message.c:1252
                    usb_set_configuration+0x11a7/0x1e50 drivers/usb/core/message.c:2216
                    usb_generic_driver_probe+0xb1/0x110 drivers/usb/core/generic.c:250
                    usb_probe_device+0xef/0x400 drivers/usb/core/driver.c:291
                    call_driver_probe drivers/base/dd.c:581 [inline]
                    really_probe+0x241/0xb20 drivers/base/dd.c:659
                    __driver_probe_device+0x1de/0x470 drivers/base/dd.c:801
                    driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831
                    __device_attach_driver+0x1df/0x350 drivers/base/dd.c:959
                    bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
                    __device_attach+0x1e4/0x4e0 drivers/base/dd.c:1031
                    device_initial_probe+0xaa/0xc0 drivers/base/dd.c:1086
                    bus_probe_device+0x64/0x150 drivers/base/bus.c:574
                    device_add+0x116e/0x1980 drivers/base/core.c:3689
                    usb_new_device+0xd07/0x1a90 drivers/usb/core/hub.c:2695
                    hub_port_connect drivers/usb/core/hub.c:5567 [inline]
                    hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
                    port_event drivers/usb/core/hub.c:5871 [inline]
                    hub_event+0x313a/0x52f0 drivers/usb/core/hub.c:5953
                    process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
                    process_scheduled_works kernel/workqueue.c:3340 [inline]
                    worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
                    kthread+0x3c5/0x780 kernel/kthread.c:463
                    ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
                    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
   INITIAL USE at:
                   lock_acquire kernel/locking/lockdep.c:5868 [inline]
                   lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825
                   __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
                   _raw_spin_lock_irq+0x36/0x50 kernel/locking/spinlock.c:170
                   spin_lock_irq include/linux/spinlock.h:376 [inline]
                   evdev_fetch_next_event drivers/input/evdev.c:543 [inline]
                   evdev_read+0x436/0xee0 drivers/input/evdev.c:584
                   do_loop_readv_writev fs/read_write.c:847 [inline]
                   do_loop_readv_writev fs/read_write.c:835 [inline]
                   vfs_readv+0x5c1/0x8b0 fs/read_write.c:1020
                   do_readv+0x28c/0x340 fs/read_write.c:1080
                   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                   do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
                   entry_SYSCALL_64_after_hwframe+0x77/0x7f
 }
 ... key      at: [<ffffffff9af36660>] __key.88+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+0x179/0x330 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:1672
                        do_wait+0x21d/0x570 kernel/exit.c:1716
                        kernel_wait+0x9f/0x160 kernel/exit.c:1892
                        call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
                        call_usermodehelper_exec_work+0xf1/0x170 kernel/umh.c:163
                        process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
                        process_scheduled_works kernel/workqueue.c:3340 [inline]
                        worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
                        kthread+0x3c5/0x780 kernel/kthread.c:463
                        ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
                        ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
     SOFTIRQ-ON-R at:
                        lock_acquire kernel/locking/lockdep.c:5868 [inline]
                        lock_acquire+0x179/0x330 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:1672
                        do_wait+0x21d/0x570 kernel/exit.c:1716
                        kernel_wait+0x9f/0x160 kernel/exit.c:1892
                        call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
                        call_usermodehelper_exec_work+0xf1/0x170 kernel/umh.c:163
                        process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
                        process_scheduled_works kernel/workqueue.c:3340 [inline]
                        worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
                        kthread+0x3c5/0x780 kernel/kthread.c:463
                        ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
                        ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
     INITIAL USE at:
                       lock_acquire kernel/locking/lockdep.c:5868 [inline]
                       lock_acquire+0x179/0x330 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+0x4668/0x7430 kernel/fork.c:2367
                       kernel_clone+0xfc/0x910 kernel/fork.c:2651
                       user_mode_thread+0xc8/0x110 kernel/fork.c:2727
                       rest_init+0x23/0x2b0 init/main.c:722
                       start_kernel+0x3ef/0x4d0 init/main.c:1206
                       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+0x179/0x330 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:1672
                            do_wait+0x21d/0x570 kernel/exit.c:1716
                            kernel_wait+0x9f/0x160 kernel/exit.c:1892
                            call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
                            call_usermodehelper_exec_work+0xf1/0x170 kernel/umh.c:163
                            process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
                            process_scheduled_works kernel/workqueue.c:3340 [inline]
                            worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
                            kthread+0x3c5/0x780 kernel/kthread.c:463
                            ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
                            ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
   }
   ... 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:978
   sk_send_sigurg+0x76/0x360 net/core/sock.c:3669
   queue_oob net/unix/af_unix.c:2357 [inline]
   unix_stream_sendmsg+0xfa3/0x1320 net/unix/af_unix.c:2491
   sock_sendmsg_nosec net/socket.c:727 [inline]
   __sock_sendmsg net/socket.c:742 [inline]
   ____sys_sendmsg+0xa5d/0xc30 net/socket.c:2592
   ___sys_sendmsg+0x134/0x1d0 net/socket.c:2646
   __sys_sendmsg+0x16d/0x220 net/socket.c:2678
   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
   do_syscall_64+0xcd/0xf80 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+0x179/0x330 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:1895 [inline]
                     generic_setlease+0xf0f/0x1330 fs/locks.c:1971
                     kernel_setlease+0x106/0x140 fs/locks.c:2020
                     vfs_setlease+0x1e8/0x280 fs/locks.c:2053
                     do_fcntl_add_lease+0x3c4/0x550 fs/locks.c:2074
                     fcntl_setlease+0xfc/0x180 fs/locks.c:2099
                     do_fcntl+0x153b/0x1660 fs/fcntl.c:535
                     __do_sys_fcntl fs/fcntl.c:602 [inline]
                     __se_sys_fcntl fs/fcntl.c:587 [inline]
                     __x64_sys_fcntl+0x163/0x200 fs/fcntl.c:587
                     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                     do_syscall_64+0xcd/0xf80 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+0x179/0x330 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_sigurg+0x5f/0xc80 fs/fcntl.c:962
                          sk_send_sigurg+0x76/0x360 net/core/sock.c:3669
                          queue_oob net/unix/af_unix.c:2357 [inline]
                          unix_stream_sendmsg+0xfa3/0x1320 net/unix/af_unix.c:2491
                          sock_sendmsg_nosec net/socket.c:727 [inline]
                          __sock_sendmsg net/socket.c:742 [inline]
                          ____sys_sendmsg+0xa5d/0xc30 net/socket.c:2592
                          ___sys_sendmsg+0x134/0x1d0 net/socket.c:2646
                          __sys_sendmmsg+0x200/0x420 net/socket.c:2735
                          __do_sys_sendmmsg net/socket.c:2762 [inline]
                          __se_sys_sendmmsg net/socket.c:2759 [inline]
                          __x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2759
                          do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                          do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
                          entry_SYSCALL_64_after_hwframe+0x77/0x7f
  }
  ... key      at: [<ffffffff9ac503c0>] __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:918
   kill_fasync_rcu fs/fcntl.c:1144 [inline]
   kill_fasync fs/fcntl.c:1159 [inline]
   kill_fasync+0x214/0x510 fs/fcntl.c:1152
   __receive_buf drivers/tty/n_tty.c:1632 [inline]
   n_tty_receive_buf_common+0x5d1/0x19d0 drivers/tty/n_tty.c:1715
   tiocsti drivers/tty/tty_io.c:2290 [inline]
   tty_ioctl+0x583/0x1650 drivers/tty/tty_io.c:2706
   vfs_ioctl fs/ioctl.c:51 [inline]
   __do_sys_ioctl fs/ioctl.c:597 [inline]
   __se_sys_ioctl fs/ioctl.c:583 [inline]
   __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
   do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
   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+0x179/0x330 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:1012
                   fasync_helper+0xaf/0xd0 fs/fcntl.c:1115
                   fuse_dev_fasync+0xad/0x100 fs/fuse/dev.c:2572
                   __fput+0x96b/0xb70 fs/file_table.c:465
                   task_work_run+0x150/0x240 kernel/task_work.c:233
                   resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
                   __exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
                   exit_to_user_mode_loop+0xfb/0x540 kernel/entry/common.c:75
                   __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
                   syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
                   syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
                   syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
                   do_syscall_64+0x4ee/0xf80 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+0x179/0x330 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:1135 [inline]
                        kill_fasync fs/fcntl.c:1159 [inline]
                        kill_fasync+0x138/0x510 fs/fcntl.c:1152
                        mousedev_write+0x61c/0x850 drivers/input/mousedev.c:710
                        do_loop_readv_writev fs/read_write.c:850 [inline]
                        do_loop_readv_writev fs/read_write.c:835 [inline]
                        vfs_writev+0x5df/0xde0 fs/read_write.c:1059
                        do_writev+0x28c/0x340 fs/read_write.c:1103
                        do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                        do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
                        entry_SYSCALL_64_after_hwframe+0x77/0x7f
 }
 ... key      at: [<ffffffff9ac50380>] __key.0+0x0/0x40
 ... acquired at:
   lock_acquire kernel/locking/lockdep.c:5868 [inline]
   lock_acquire+0x179/0x330 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:1135 [inline]
   kill_fasync fs/fcntl.c:1159 [inline]
   kill_fasync+0x138/0x510 fs/fcntl.c:1152
   __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/0xf80 arch/x86/entry/syscall_64.c:94
   entry_SYSCALL_64_after_hwframe+0x77/0x7f


stack backtrace:
CPU: 1 UID: 0 PID: 14749 Comm: syz.3.11129 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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+0x8e6/0xbc0 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+0x167f/0x2890 kernel/locking/lockdep.c:5237
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x179/0x330 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:1135 [inline]
 kill_fasync fs/fcntl.c:1159 [inline]
 kill_fasync+0x138/0x510 fs/fcntl.c:1152
 __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/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd712d8f749
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:00007fd713c2c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd712fe5fa0 RCX: 00007fd712d8f749
RDX: 0000000000000037 RSI: 0000200000000040 RDI: 0000000000000004
RBP: 00007fd712e13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd712fe6038 R14: 00007fd712fe5fa0 R15: 00007ffd27c01288
 </TASK>