syzbot

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
syzkaller #0 Tainted: G             L     
-----------------------------------------------------
syz.1.23235/25949 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffff888029a93600 (&new->fa_lock){....}-{3:3}, at: kill_fasync_rcu fs/fcntl.c:1135 [inline]
ffff888029a93600 (&new->fa_lock){....}-{3:3}, at: kill_fasync+0x199/0x4d0 fs/fcntl.c:1159

and this task is already holding:
ffff88802ae4e028 (&client->buffer_lock){..-.}-{3:3}, at: spin_lock include/linux/spinlock.h:341 [inline]
ffff88802ae4e028 (&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+0xf0/0x2e0 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:154
  spin_lock include/linux/spinlock.h:341 [inline]
  evdev_pass_values+0xb9/0xbd0 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+0x330/0x6b0 drivers/input/input.c:342
  input_event+0x89/0xe0 drivers/input/input.c:396
  input_sync include/linux/input.h:464 [inline]
  hidinput_report_event+0xa1/0x100 drivers/hid/hid-input.c:1764
  hid_report_raw_event+0x1489/0x1720 drivers/hid/hid-core.c:2081
  __hid_input_report drivers/hid/hid-core.c:2144 [inline]
  hid_input_report+0x44b/0x580 drivers/hid/hid-core.c:2166
  hid_irq_in+0x47e/0x6d0 drivers/hid/usbhid/hid-core.c:286
  __usb_hcd_giveback_urb+0x376/0x540 drivers/usb/core/hcd.c:1657
  dummy_timer+0xbbd/0x45d0 drivers/usb/gadget/udc/dummy_hcd.c:1995
  __run_hrtimer kernel/time/hrtimer.c:1785 [inline]
  __hrtimer_run_queues+0x53a/0xcc0 kernel/time/hrtimer.c:1849
  hrtimer_run_softirq+0x182/0x5a0 kernel/time/hrtimer.c:1866
  handle_softirqs+0x22a/0x870 kernel/softirq.c:622
  __do_softirq kernel/softirq.c:656 [inline]
  invoke_softirq kernel/softirq.c:496 [inline]
  __irq_exit_rcu+0x5f/0x150 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+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
  asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
  __read_once_word_nocheck+0x3/0x10 include/asm-generic/rwonce.h:67
  deref_stack_reg arch/x86/kernel/unwind_orc.c:422 [inline]
  unwind_next_frame+0xe52/0x23c0 arch/x86/kernel/unwind_orc.c:600
  arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
  stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
  kasan_save_stack mm/kasan/common.c:57 [inline]
  kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
  poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
  __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
  kasan_kmalloc include/linux/kasan.h:263 [inline]
  __kmalloc_cache_noprof+0x31c/0x660 mm/slub.c:5339
  kmalloc_noprof include/linux/slab.h:962 [inline]
  kzalloc_noprof include/linux/slab.h:1200 [inline]
  kobject_uevent_env+0x28c/0x9e0 lib/kobject_uevent.c:540
  really_probe+0x789/0xaf0 drivers/base/dd.c:711
  __driver_probe_device+0x18c/0x320 drivers/base/dd.c:803
  driver_probe_device+0x4f/0x240 drivers/base/dd.c:833
  __device_attach_driver+0x2d4/0x4c0 drivers/base/dd.c:961
  bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
  __device_attach+0x2c5/0x450 drivers/base/dd.c:1033
  device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1088
  bus_probe_device+0x12a/0x220 drivers/base/bus.c:574
  device_add+0x7b6/0xb70 drivers/base/core.c:3689
  hid_add_device+0x272/0x3e0 drivers/hid/hid-core.c:2951
  usbhid_probe+0xe3a/0x12f0 drivers/hid/usbhid/hid-core.c:1450
  usb_probe_interface+0x668/0xc90 drivers/usb/core/driver.c:396
  call_driver_probe drivers/base/dd.c:-1 [inline]
  really_probe+0x267/0xaf0 drivers/base/dd.c:661
  __driver_probe_device+0x18c/0x320 drivers/base/dd.c:803
  driver_probe_device+0x4f/0x240 drivers/base/dd.c:833
  __device_attach_driver+0x2d4/0x4c0 drivers/base/dd.c:961
  bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
  __device_attach+0x2c5/0x450 drivers/base/dd.c:1033
  device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1088
  bus_probe_device+0x12a/0x220 drivers/base/bus.c:574
  device_add+0x7b6/0xb70 drivers/base/core.c:3689
  usb_set_configuration+0x1a87/0x2110 drivers/usb/core/message.c:2208
  usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
  usb_probe_device+0x1c4/0x3b0 drivers/usb/core/driver.c:291
  call_driver_probe drivers/base/dd.c:-1 [inline]
  really_probe+0x267/0xaf0 drivers/base/dd.c:661
  __driver_probe_device+0x18c/0x320 drivers/base/dd.c:803
  driver_probe_device+0x4f/0x240 drivers/base/dd.c:833
  __device_attach_driver+0x2d4/0x4c0 drivers/base/dd.c:961
  bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
  __device_attach+0x2c5/0x450 drivers/base/dd.c:1033
  device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1088
  bus_probe_device+0x12a/0x220 drivers/base/bus.c:574
  device_add+0x7b6/0xb70 drivers/base/core.c:3689
  usb_new_device+0xa08/0x16f0 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+0x2a1c/0x4f30 drivers/usb/core/hub.c:5953
  process_one_work kernel/workqueue.c:3275 [inline]
  process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
  worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
  kthread+0x388/0x470 kernel/kthread.c:467
  ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
  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+0xf0/0x2e0 kernel/locking/lockdep.c:5868
  __raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
  _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
  __do_wait+0xde/0x740 kernel/exit.c:1672
  do_wait+0x1e7/0x540 kernel/exit.c:1716
  kernel_wait+0xd6/0x1c0 kernel/exit.c:1892
  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:3275 [inline]
  process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
  worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
  kthread+0x388/0x470 kernel/kthread.c:467
  ret_from_fork+0x51e/0xb90 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.1.23235/25949:
 #0: ffff88802b734118 (&evdev->mutex){+.+.}-{4:4}, at: evdev_write+0x1ae/0x4c0 drivers/input/evdev.c:511
 #1: ffff88801f7b0230 (&dev->event_lock#2){..-.}-{3:3}, at: class_spinlock_irqsave_constructor include/linux/spinlock.h:618 [inline]
 #1: ffff88801f7b0230 (&dev->event_lock#2){..-.}-{3:3}, at: input_inject_event+0xa5/0x340 drivers/input/input.c:419
 #2: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #2: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #2: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
 #2: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: input_inject_event+0xb6/0x340 drivers/input/input.c:420
 #3: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #3: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #3: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
 #3: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: input_pass_values+0x8d/0x890 drivers/input/input.c:119
 #4: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #4: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #4: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: evdev_events+0x79/0x340 drivers/input/evdev.c:298
 #5: ffff88802ae4e028 (&client->buffer_lock){..-.}-{3:3}, at: spin_lock include/linux/spinlock.h:341 [inline]
 #5: ffff88802ae4e028 (&client->buffer_lock){..-.}-{3:3}, at: evdev_pass_values+0xb9/0xbd0 drivers/input/evdev.c:261
 #6: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #6: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #6: ffffffff8e7602e0 (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+0xf0/0x2e0 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:154
                    spin_lock include/linux/spinlock.h:341 [inline]
                    evdev_pass_values+0xb9/0xbd0 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+0x330/0x6b0 drivers/input/input.c:342
                    input_event+0x89/0xe0 drivers/input/input.c:396
                    input_sync include/linux/input.h:464 [inline]
                    hidinput_report_event+0xa1/0x100 drivers/hid/hid-input.c:1764
                    hid_report_raw_event+0x1489/0x1720 drivers/hid/hid-core.c:2081
                    __hid_input_report drivers/hid/hid-core.c:2144 [inline]
                    hid_input_report+0x44b/0x580 drivers/hid/hid-core.c:2166
                    hid_irq_in+0x47e/0x6d0 drivers/hid/usbhid/hid-core.c:286
                    __usb_hcd_giveback_urb+0x376/0x540 drivers/usb/core/hcd.c:1657
                    dummy_timer+0xbbd/0x45d0 drivers/usb/gadget/udc/dummy_hcd.c:1995
                    __run_hrtimer kernel/time/hrtimer.c:1785 [inline]
                    __hrtimer_run_queues+0x53a/0xcc0 kernel/time/hrtimer.c:1849
                    hrtimer_run_softirq+0x182/0x5a0 kernel/time/hrtimer.c:1866
                    handle_softirqs+0x22a/0x870 kernel/softirq.c:622
                    __do_softirq kernel/softirq.c:656 [inline]
                    invoke_softirq kernel/softirq.c:496 [inline]
                    __irq_exit_rcu+0x5f/0x150 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+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
                    asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
                    __read_once_word_nocheck+0x3/0x10 include/asm-generic/rwonce.h:67
                    deref_stack_reg arch/x86/kernel/unwind_orc.c:422 [inline]
                    unwind_next_frame+0xe52/0x23c0 arch/x86/kernel/unwind_orc.c:600
                    arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
                    stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
                    kasan_save_stack mm/kasan/common.c:57 [inline]
                    kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
                    poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
                    __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
                    kasan_kmalloc include/linux/kasan.h:263 [inline]
                    __kmalloc_cache_noprof+0x31c/0x660 mm/slub.c:5339
                    kmalloc_noprof include/linux/slab.h:962 [inline]
                    kzalloc_noprof include/linux/slab.h:1200 [inline]
                    kobject_uevent_env+0x28c/0x9e0 lib/kobject_uevent.c:540
                    really_probe+0x789/0xaf0 drivers/base/dd.c:711
                    __driver_probe_device+0x18c/0x320 drivers/base/dd.c:803
                    driver_probe_device+0x4f/0x240 drivers/base/dd.c:833
                    __device_attach_driver+0x2d4/0x4c0 drivers/base/dd.c:961
                    bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
                    __device_attach+0x2c5/0x450 drivers/base/dd.c:1033
                    device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1088
                    bus_probe_device+0x12a/0x220 drivers/base/bus.c:574
                    device_add+0x7b6/0xb70 drivers/base/core.c:3689
                    hid_add_device+0x272/0x3e0 drivers/hid/hid-core.c:2951
                    usbhid_probe+0xe3a/0x12f0 drivers/hid/usbhid/hid-core.c:1450
                    usb_probe_interface+0x668/0xc90 drivers/usb/core/driver.c:396
                    call_driver_probe drivers/base/dd.c:-1 [inline]
                    really_probe+0x267/0xaf0 drivers/base/dd.c:661
                    __driver_probe_device+0x18c/0x320 drivers/base/dd.c:803
                    driver_probe_device+0x4f/0x240 drivers/base/dd.c:833
                    __device_attach_driver+0x2d4/0x4c0 drivers/base/dd.c:961
                    bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
                    __device_attach+0x2c5/0x450 drivers/base/dd.c:1033
                    device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1088
                    bus_probe_device+0x12a/0x220 drivers/base/bus.c:574
                    device_add+0x7b6/0xb70 drivers/base/core.c:3689
                    usb_set_configuration+0x1a87/0x2110 drivers/usb/core/message.c:2208
                    usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
                    usb_probe_device+0x1c4/0x3b0 drivers/usb/core/driver.c:291
                    call_driver_probe drivers/base/dd.c:-1 [inline]
                    really_probe+0x267/0xaf0 drivers/base/dd.c:661
                    __driver_probe_device+0x18c/0x320 drivers/base/dd.c:803
                    driver_probe_device+0x4f/0x240 drivers/base/dd.c:833
                    __device_attach_driver+0x2d4/0x4c0 drivers/base/dd.c:961
                    bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
                    __device_attach+0x2c5/0x450 drivers/base/dd.c:1033
                    device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1088
                    bus_probe_device+0x12a/0x220 drivers/base/bus.c:574
                    device_add+0x7b6/0xb70 drivers/base/core.c:3689
                    usb_new_device+0xa08/0x16f0 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+0x2a1c/0x4f30 drivers/usb/core/hub.c:5953
                    process_one_work kernel/workqueue.c:3275 [inline]
                    process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
                    worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
                    kthread+0x388/0x470 kernel/kthread.c:467
                    ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
                    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
   INITIAL USE at:
                   lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
                   __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
                   _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162
                   evdev_set_clk_type drivers/input/evdev.c:201 [inline]
                   evdev_do_ioctl drivers/input/evdev.c:1124 [inline]
                   evdev_ioctl_handler+0x10fb/0x1fe0 drivers/input/evdev.c:1270
                   vfs_ioctl fs/ioctl.c:51 [inline]
                   __do_sys_ioctl fs/ioctl.c:597 [inline]
                   __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
                   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                   do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
                   entry_SYSCALL_64_after_hwframe+0x77/0x7f
 }
 ... key      at: [<ffffffff9a604660>] 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+0xf0/0x2e0 kernel/locking/lockdep.c:5868
                        __raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
                        _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
                        __do_wait+0xde/0x740 kernel/exit.c:1672
                        do_wait+0x1e7/0x540 kernel/exit.c:1716
                        kernel_wait+0xd6/0x1c0 kernel/exit.c:1892
                        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:3275 [inline]
                        process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
                        worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
                        kthread+0x388/0x470 kernel/kthread.c:467
                        ret_from_fork+0x51e/0xb90 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+0xf0/0x2e0 kernel/locking/lockdep.c:5868
                        __raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
                        _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
                        __do_wait+0xde/0x740 kernel/exit.c:1672
                        do_wait+0x1e7/0x540 kernel/exit.c:1716
                        kernel_wait+0xd6/0x1c0 kernel/exit.c:1892
                        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:3275 [inline]
                        process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
                        worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
                        kthread+0x388/0x470 kernel/kthread.c:467
                        ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
                        ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
     INITIAL USE at:
                       lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
                       __raw_write_lock_irq include/linux/rwlock_api_smp.h:211 [inline]
                       _raw_write_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:326
                       copy_process+0x247a/0x3cf0 kernel/fork.c:2369
                       kernel_clone+0x248/0x8e0 kernel/fork.c:2654
                       user_mode_thread+0x110/0x180 kernel/fork.c:2730
                       rest_init+0x23/0x300 init/main.c:725
                       start_kernel+0x385/0x3d0 init/main.c:1210
                       x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
                       x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291
                       common_startup_64+0x13e/0x147
     INITIAL READ USE at:
                            lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
                            __raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
                            _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
                            __do_wait+0xde/0x740 kernel/exit.c:1672
                            do_wait+0x1e7/0x540 kernel/exit.c:1716
                            kernel_wait+0xd6/0x1c0 kernel/exit.c:1892
                            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:3275 [inline]
                            process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
                            worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
                            kthread+0x388/0x470 kernel/kthread.c:467
                            ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
                            ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
   }
   ... key      at: [<ffffffff8e40c058>] tasklist_lock+0x18/0x40
   ... acquired at:
   __raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
   _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
   send_sigurg+0x12b/0x420 fs/fcntl.c:978
   sk_send_sigurg+0x6c/0x2e0 net/core/sock.c:3669
   queue_oob+0x42c/0x4f0 net/unix/af_unix.c:2352
   unix_stream_sendmsg+0xcb1/0xe80 net/unix/af_unix.c:2486
   sock_sendmsg_nosec net/socket.c:727 [inline]
   __sock_sendmsg net/socket.c:742 [inline]
   ____sys_sendmsg+0xa68/0xad0 net/socket.c:2592
   ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646
   __sys_sendmmsg+0x27c/0x4e0 net/socket.c:2735
   __do_sys_sendmmsg net/socket.c:2762 [inline]
   __se_sys_sendmmsg net/socket.c:2759 [inline]
   __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2759
   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
   do_syscall_64+0x14d/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+0xf0/0x2e0 kernel/locking/lockdep.c:5868
                     __raw_write_lock_irq include/linux/rwlock_api_smp.h:211 [inline]
                     _raw_write_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:326
                     __f_setown+0x67/0x370 fs/fcntl.c:136
                     f_setown+0x23a/0x300 fs/fcntl.c:183
                     sock_ioctl+0x615/0x7f0 net/socket.c:1316
                     vfs_ioctl fs/ioctl.c:51 [inline]
                     __do_sys_ioctl fs/ioctl.c:597 [inline]
                     __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
                     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                     do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
                     entry_SYSCALL_64_after_hwframe+0x77/0x7f
    INITIAL READ USE at:
                          lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
                          __raw_read_lock_irq include/linux/rwlock_api_smp.h:182 [inline]
                          _raw_read_lock_irq+0x45/0x60 kernel/locking/spinlock.c:244
                          f_getown+0x54/0x2a0 fs/fcntl.c:204
                          do_fcntl+0x1ac/0x1a20 fs/fcntl.c:510
                          __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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
                          entry_SYSCALL_64_after_hwframe+0x77/0x7f
  }
  ... key      at: [<ffffffff9a2e5160>] file_f_owner_allocate.__key+0x0/0x20
  ... acquired at:
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:172 [inline]
   _raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:236
   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+0x81c/0x1e80 fs/locks.c:1657
   break_lease include/linux/filelock.h:484 [inline]
   do_dentry_open+0x1010/0x14e0 fs/open.c:940
   vfs_open+0x3b/0x340 fs/open.c:1081
   do_open fs/namei.c:4671 [inline]
   path_openat+0x2e08/0x3860 fs/namei.c:4830
   do_file_open+0x23e/0x4a0 fs/namei.c:4859
   do_sys_openat2+0x113/0x200 fs/open.c:1366
   do_sys_open fs/open.c:1372 [inline]
   __do_sys_openat fs/open.c:1388 [inline]
   __se_sys_openat fs/open.c:1383 [inline]
   __x64_sys_openat+0x138/0x170 fs/open.c:1383
   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
   do_syscall_64+0x14d/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+0xf0/0x2e0 kernel/locking/lockdep.c:5868
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:211 [inline]
                   _raw_write_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:326
                   fasync_remove_entry+0xf1/0x1c0 fs/fcntl.c:1012
                   __fput+0x8a5/0xa70 fs/file_table.c:466
                   task_work_run+0x1d9/0x270 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:67 [inline]
                   exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
                   __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 include/linux/entry-common.h:325 [inline]
                   do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
                   entry_SYSCALL_64_after_hwframe+0x77/0x7f
   INITIAL READ USE at:
                        lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
                        __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:172 [inline]
                        _raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:236
                        kill_fasync_rcu fs/fcntl.c:1135 [inline]
                        kill_fasync+0x199/0x4d0 fs/fcntl.c:1159
                        pipe_release+0x19c/0x330 fs/pipe.c:739
                        __fput+0x44f/0xa70 fs/file_table.c:469
                        task_work_run+0x1d9/0x270 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:67 [inline]
                        exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
                        __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 include/linux/entry-common.h:325 [inline]
                        do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
                        entry_SYSCALL_64_after_hwframe+0x77/0x7f
 }
 ... key      at: [<ffffffff9a2e5180>] fasync_insert_entry.__key+0x0/0x20
 ... acquired at:
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:172 [inline]
   _raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:236
   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+0x627/0xbd0 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/0x340 drivers/input/input.c:424
   evdev_write+0x325/0x4c0 drivers/input/evdev.c:528
   vfs_write+0x29a/0xb90 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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
   entry_SYSCALL_64_after_hwframe+0x77/0x7f


stack backtrace:
CPU: 0 UID: 0 PID: 25949 Comm: syz.1.23235 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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+0x2a94/0x2cf0 kernel/locking/lockdep.c:5237
 lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:172 [inline]
 _raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:236
 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+0x627/0xbd0 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/0x340 drivers/input/input.c:424
 evdev_write+0x325/0x4c0 drivers/input/evdev.c:528
 vfs_write+0x29a/0xb90 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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc006d9c629
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:00007fc004ff6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fc007015fa0 RCX: 00007fc006d9c629
RDX: 0000000000001068 RSI: 0000200000000040 RDI: 0000000000000004
RBP: 00007fc006e32b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc007016038 R14: 00007fc007015fa0 R15: 00007fc00713fa48
 </TASK>