syzbot

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
syzkaller #0 Tainted: G             L     
-----------------------------------------------------
syz.5.6047/27371 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffff88804f48e6a8 (&new->fa_lock){....}-{3:3}, at: kill_fasync_rcu fs/fcntl.c:1135 [inline]
ffff88804f48e6a8 (&new->fa_lock){....}-{3:3}, at: kill_fasync+0x199/0x4d0 fs/fcntl.c:1159

and this task is already holding:
ffff888057dac028 (&client->buffer_lock){..-.}-{3:3}, at: spin_lock include/linux/spinlock.h:341 [inline]
ffff888057dac028 (&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+0x3e5/0x6b0 drivers/input/input.c:353
  input_event+0x89/0xe0 drivers/input/input.c:396
  hidinput_hid_event+0x1487/0x1e60 drivers/hid/hid-input.c:1747
  hid_process_event+0x4be/0x620 drivers/hid/hid-core.c:1565
  hid_process_report drivers/hid/hid-core.c:1713 [inline]
  hid_report_raw_event+0xe8f/0x1720 drivers/hid/hid-core.c:2074
  __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
  console_flush_one_record arch/x86/include/asm/irqflags.h:-1 [inline]
  console_flush_all+0x801/0xb20 kernel/printk/printk.c:3343
  __console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
  console_unlock+0xd1/0x1c0 kernel/printk/printk.c:3413
  vprintk_emit+0x485/0x560 kernel/printk/printk.c:2479
  dev_vprintk_emit+0x355/0x420 drivers/base/core.c:4913
  dev_printk_emit+0xee/0x140 drivers/base/core.c:4924
  _dev_notice+0x11e/0x180 drivers/base/core.c:4981
  usb_parse_configuration drivers/usb/core/config.c:745 [inline]
  usb_get_configuration+0xbf3/0x54f0 drivers/usb/core/config.c:1002
  usb_enumerate_device drivers/usb/core/hub.c:2527 [inline]
  usb_new_device+0x145/0x16f0 drivers/usb/core/hub.c:2665
  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:3276 [inline]
  process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
  worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
  kthread+0x388/0x470 kernel/kthread.c:436
  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:1678
  do_wait+0x1e7/0x540 kernel/exit.c:1722
  kernel_wait+0xd6/0x1c0 kernel/exit.c:1898
  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:3276 [inline]
  process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
  worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
  kthread+0x388/0x470 kernel/kthread.c:436
  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.5.6047/27371:
 #0: ffff88802bac8118 (&evdev->mutex){+.+.}-{4:4}, at: evdev_write+0x1ae/0x4c0 drivers/input/evdev.c:511
 #1: ffff88801f3fa230 (&dev->event_lock#2){..-.}-{3:3}, at: class_spinlock_irqsave_constructor include/linux/spinlock.h:618 [inline]
 #1: ffff88801f3fa230 (&dev->event_lock#2){..-.}-{3:3}, at: input_inject_event+0xa5/0x340 drivers/input/input.c:419
 #2: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #2: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #2: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
 #2: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: input_inject_event+0xb6/0x340 drivers/input/input.c:420
 #3: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #3: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #3: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
 #3: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: input_pass_values+0x8d/0x890 drivers/input/input.c:119
 #4: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #4: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #4: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: evdev_events+0x79/0x340 drivers/input/evdev.c:298
 #5: ffff888057dac028 (&client->buffer_lock){..-.}-{3:3}, at: spin_lock include/linux/spinlock.h:341 [inline]
 #5: ffff888057dac028 (&client->buffer_lock){..-.}-{3:3}, at: evdev_pass_values+0xb9/0xbd0 drivers/input/evdev.c:261
 #6: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #6: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #6: ffffffff8e75e520 (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+0x3e5/0x6b0 drivers/input/input.c:353
                    input_event+0x89/0xe0 drivers/input/input.c:396
                    hidinput_hid_event+0x1487/0x1e60 drivers/hid/hid-input.c:1747
                    hid_process_event+0x4be/0x620 drivers/hid/hid-core.c:1565
                    hid_process_report drivers/hid/hid-core.c:1713 [inline]
                    hid_report_raw_event+0xe8f/0x1720 drivers/hid/hid-core.c:2074
                    __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
                    console_flush_one_record arch/x86/include/asm/irqflags.h:-1 [inline]
                    console_flush_all+0x801/0xb20 kernel/printk/printk.c:3343
                    __console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
                    console_unlock+0xd1/0x1c0 kernel/printk/printk.c:3413
                    vprintk_emit+0x485/0x560 kernel/printk/printk.c:2479
                    dev_vprintk_emit+0x355/0x420 drivers/base/core.c:4913
                    dev_printk_emit+0xee/0x140 drivers/base/core.c:4924
                    _dev_notice+0x11e/0x180 drivers/base/core.c:4981
                    usb_parse_configuration drivers/usb/core/config.c:745 [inline]
                    usb_get_configuration+0xbf3/0x54f0 drivers/usb/core/config.c:1002
                    usb_enumerate_device drivers/usb/core/hub.c:2527 [inline]
                    usb_new_device+0x145/0x16f0 drivers/usb/core/hub.c:2665
                    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:3276 [inline]
                    process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
                    worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
                    kthread+0x388/0x470 kernel/kthread.c:436
                    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 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+0x3e5/0x6b0 drivers/input/input.c:353
                   input_event+0x89/0xe0 drivers/input/input.c:396
                   hidinput_hid_event+0x1487/0x1e60 drivers/hid/hid-input.c:1747
                   hid_process_event+0x4be/0x620 drivers/hid/hid-core.c:1565
                   hid_process_report drivers/hid/hid-core.c:1713 [inline]
                   hid_report_raw_event+0xe8f/0x1720 drivers/hid/hid-core.c:2074
                   __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
                   console_flush_one_record arch/x86/include/asm/irqflags.h:-1 [inline]
                   console_flush_all+0x801/0xb20 kernel/printk/printk.c:3343
                   __console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
                   console_unlock+0xd1/0x1c0 kernel/printk/printk.c:3413
                   vprintk_emit+0x485/0x560 kernel/printk/printk.c:2479
                   dev_vprintk_emit+0x355/0x420 drivers/base/core.c:4913
                   dev_printk_emit+0xee/0x140 drivers/base/core.c:4924
                   _dev_notice+0x11e/0x180 drivers/base/core.c:4981
                   usb_parse_configuration drivers/usb/core/config.c:745 [inline]
                   usb_get_configuration+0xbf3/0x54f0 drivers/usb/core/config.c:1002
                   usb_enumerate_device drivers/usb/core/hub.c:2527 [inline]
                   usb_new_device+0x145/0x16f0 drivers/usb/core/hub.c:2665
                   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:3276 [inline]
                   process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
                   worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
                   kthread+0x388/0x470 kernel/kthread.c:436
                   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: [<ffffffff9a60b800>] 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:1678
                        do_wait+0x1e7/0x540 kernel/exit.c:1722
                        kernel_wait+0xd6/0x1c0 kernel/exit.c:1898
                        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:3276 [inline]
                        process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
                        worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
                        kthread+0x388/0x470 kernel/kthread.c:436
                        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:1678
                        do_wait+0x1e7/0x540 kernel/exit.c:1722
                        kernel_wait+0xd6/0x1c0 kernel/exit.c:1898
                        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:3276 [inline]
                        process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
                        worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
                        kthread+0x388/0x470 kernel/kthread.c:436
                        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/0x3cd0 kernel/fork.c:2369
                       kernel_clone+0x248/0x8e0 kernel/fork.c:2653
                       user_mode_thread+0x110/0x180 kernel/fork.c:2729
                       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:1678
                            do_wait+0x1e7/0x540 kernel/exit.c:1722
                            kernel_wait+0xd6/0x1c0 kernel/exit.c:1898
                            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:3276 [inline]
                            process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
                            worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
                            kthread+0x388/0x470 kernel/kthread.c:436
                            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_sigio+0x101/0x370 fs/fcntl.c:932
   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+0x1831/0x1ae0 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:4586 [inline]
   path_openat+0x15c2/0x3860 fs/namei.c:4827
   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

 -> (&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
                     fcntl_dirnotify+0x3f9/0x6a0 fs/notify/dnotify/dnotify.c:369
                     do_fcntl+0x77e/0x1a20 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+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_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
                          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+0x1831/0x1ae0 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:4586 [inline]
                          path_openat+0x15c2/0x3860 fs/namei.c:4827
                          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
  }
  ... key      at: [<ffffffff9a2ec1e0>] 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
   vfs_truncate+0x449/0x540 fs/open.c:112
   do_sys_truncate+0xf3/0x1c0 fs/open.c:142
   __do_sys_truncate fs/open.c:154 [inline]
   __se_sys_truncate fs/open.c:152 [inline]
   __x64_sys_truncate+0x5b/0x70 fs/open.c:152
   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
                   sock_fasync+0x85/0xf0 net/socket.c:1480
                   __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
                        sock_wake_async+0x137/0x160 net/socket.c:-1
                        sk_wake_async_rcu include/net/sock.h:2579 [inline]
                        af_alg_wmem_wakeup+0x3c0/0x440 crypto/af_alg.c:851
                        aead_recvmsg+0x13f7/0x1460 crypto/algif_aead.c:322
                        sock_recvmsg_nosec net/socket.c:1078 [inline]
                        sock_recvmsg+0x172/0x1b0 net/socket.c:1100
                        sock_read_iter+0x251/0x320 net/socket.c:1170
                        new_sync_read fs/read_write.c:493 [inline]
                        vfs_read+0x582/0xa70 fs/read_write.c:574
                        ksys_read+0x150/0x270 fs/read_write.c:717
                        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: [<ffffffff9a2ec200>] 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: 1 UID: 0 PID: 27371 Comm: syz.5.6047 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: 0033:0x7f316fb9c799
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:00007f317097d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f316fe16090 RCX: 00007f316fb9c799
RDX: 0000000000000037 RSI: 0000200000000040 RDI: 0000000000000008
RBP: 00007f316fc32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f316fe16128 R14: 00007f316fe16090 R15: 00007f316ff3fa48
 </TASK>