syzbot


possible deadlock in evdev_pass_values (5)

Status: upstream: reported on 2025/08/26 05:46
Reported-by: syzbot+27084c39cb0505ecb31e@syzkaller.appspotmail.com
First crash: 172d, last: 4d07h
Similar bugs (11)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream possible deadlock in evdev_pass_values fuse kernfs 4 351 1039d 1862d 0/29 closed as dup on 2021/07/02 09:55
linux-5.15 possible deadlock in evdev_pass_values (3) 4 11 536d 569d 0/3 auto-obsoleted due to no activity on 2024/11/05 23:17
linux-6.1 possible deadlock in evdev_pass_values (3) 4 17 621d 688d 0/3 auto-obsoleted due to no activity on 2024/08/12 15:10
linux-5.15 possible deadlock in evdev_pass_values (4) 4 2 376d 387d 0/3 auto-obsoleted due to no activity on 2025/05/14 14:17
linux-6.1 possible deadlock in evdev_pass_values 4 1 959d 959d 0/3 auto-obsoleted due to no activity on 2023/10/09 19:52
linux-6.6 possible deadlock in evdev_pass_values 4 2 191d 200d 0/2 auto-obsoleted due to no activity on 2025/11/15 13:39
linux-5.15 possible deadlock in evdev_pass_values 4 6 836d 940d 0/3 auto-obsoleted due to no activity on 2024/02/09 07:09
upstream possible deadlock in evdev_pass_values (2) input 4 1674 1d03h 1030d 0/29 upstream: reported on 2023/04/21 09:42
linux-6.1 possible deadlock in evdev_pass_values (4) 4 12 122d 317d 0/3 auto-obsoleted due to no activity on 2026/01/23 14:28
linux-5.15 possible deadlock in evdev_pass_values (2) 4 22 654d 732d 0/3 auto-obsoleted due to no activity on 2024/07/10 03:27
linux-6.1 possible deadlock in evdev_pass_values (2) 4 1 820d 820d 0/3 auto-obsoleted due to no activity on 2024/02/25 22:49

Sample crash report:
=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
syzkaller #0 Not tainted
-----------------------------------------------------
syz.5.1186/10383 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffff888062096168 (&new->fa_lock){....}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:1008 [inline]
ffff888062096168 (&new->fa_lock){....}-{2:2}, at: kill_fasync+0x16d/0x490 fs/fcntl.c:1029

and this task is already holding:
ffff888077804028 (&client->buffer_lock){..-.}-{2:2}, at: spin_lock include/linux/spinlock.h:364 [inline]
ffff888077804028 (&client->buffer_lock){..-.}-{2:2}, at: evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261
which would create a new lock dependency:
 (&client->buffer_lock){..-.}-{2:2} -> (&new->fa_lock){....}-{2:2}

but this new dependency connects a SOFTIRQ-irq-safe lock:
 (&client->buffer_lock){..-.}-{2:2}

... which became SOFTIRQ-irq-safe at:
  lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
  __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
  _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
  spin_lock include/linux/spinlock.h:364 [inline]
  evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261
  evdev_events+0x1c0/0x2f0 drivers/input/evdev.c:306
  input_to_handler drivers/input/input.c:126 [inline]
  input_pass_values+0x87e/0x1210 drivers/input/input.c:156
  input_handle_event+0xbe0/0x1490 drivers/input/input.c:426
  input_inject_event+0x1b9/0x2c0 drivers/input/input.c:487
  led_trigger_event+0x10a/0x1e0 drivers/leds/led-triggers.c:392
  kbd_propagate_led_state drivers/tty/vt/keyboard.c:1075 [inline]
  kbd_bh+0x195/0x2a0 drivers/tty/vt/keyboard.c:1259
  tasklet_action_common+0x2ad/0x410 kernel/softirq.c:806
  handle_softirqs+0x339/0x830 kernel/softirq.c:576
  run_ksoftirqd+0xa4/0x100 kernel/softirq.c:943
  smpboot_thread_fn+0x4f6/0x970 kernel/smpboot.c:164
  kthread+0x436/0x520 kernel/kthread.c:334
  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

to a SOFTIRQ-irq-unsafe lock:
 (tasklist_lock){.+.+}-{2:2}

... which became SOFTIRQ-irq-unsafe at:
...
  lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
  __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
  _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
  do_wait+0x293/0xac0 kernel/exit.c:1579
  kernel_wait+0xd3/0x1c0 kernel/exit.c:1769
  call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
  call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:166
  process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
  worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
  kthread+0x436/0x520 kernel/kthread.c:334
  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

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.5.1186/10383:
 #0: ffff888148ad0110 (&evdev->mutex){+.+.}-{3:3}, at: evdev_write+0x17c/0x490 drivers/input/evdev.c:513
 #1: ffff88801e8c8230 (&dev->event_lock#2){-.-.}-{2:2}, at: input_inject_event+0x9e/0x2c0 drivers/input/input.c:482
 #2: ffffffff8c31eaa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312
 #3: ffffffff8c31eaa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312
 #4: ffffffff8c31eaa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312
 #5: ffff888077804028 (&client->buffer_lock){..-.}-{2:2}, at: spin_lock include/linux/spinlock.h:364 [inline]
 #5: ffff888077804028 (&client->buffer_lock){..-.}-{2:2}, at: evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261
 #6: ffffffff8c31eaa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
-> (&client->buffer_lock){..-.}-{2:2} {
   IN-SOFTIRQ-W at:
                    lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                    __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
                    _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
                    spin_lock include/linux/spinlock.h:364 [inline]
                    evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261
                    evdev_events+0x1c0/0x2f0 drivers/input/evdev.c:306
                    input_to_handler drivers/input/input.c:126 [inline]
                    input_pass_values+0x87e/0x1210 drivers/input/input.c:156
                    input_handle_event+0xbe0/0x1490 drivers/input/input.c:426
                    input_inject_event+0x1b9/0x2c0 drivers/input/input.c:487
                    led_trigger_event+0x10a/0x1e0 drivers/leds/led-triggers.c:392
                    kbd_propagate_led_state drivers/tty/vt/keyboard.c:1075 [inline]
                    kbd_bh+0x195/0x2a0 drivers/tty/vt/keyboard.c:1259
                    tasklet_action_common+0x2ad/0x410 kernel/softirq.c:806
                    handle_softirqs+0x339/0x830 kernel/softirq.c:576
                    run_ksoftirqd+0xa4/0x100 kernel/softirq.c:943
                    smpboot_thread_fn+0x4f6/0x970 kernel/smpboot.c:164
                    kthread+0x436/0x520 kernel/kthread.c:334
                    ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
   INITIAL USE at:
                   lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                   __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
                   _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
                   spin_lock include/linux/spinlock.h:364 [inline]
                   evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261
                   evdev_events+0x1c0/0x2f0 drivers/input/evdev.c:306
                   input_to_handler drivers/input/input.c:126 [inline]
                   input_pass_values+0x87e/0x1210 drivers/input/input.c:156
                   input_handle_event+0xb3f/0x1490 drivers/input/input.c:415
                   input_inject_event+0x1b9/0x2c0 drivers/input/input.c:487
                   evdev_write+0x35b/0x490 drivers/input/evdev.c:530
                   vfs_write+0x30b/0xd60 fs/read_write.c:592
                   ksys_write+0x152/0x260 fs/read_write.c:647
                   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                   do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
                   entry_SYSCALL_64_after_hwframe+0x66/0xd0
 }
 ... key      at: [<ffffffff9663c2e0>] evdev_open.__key.22+0x0/0x20

the dependencies between the lock to be acquired
 and SOFTIRQ-irq-unsafe lock:
  -> (tasklist_lock){.+.+}-{2:2} {
     HARDIRQ-ON-R at:
                        lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                        __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
                        _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
                        do_wait+0x293/0xac0 kernel/exit.c:1579
                        kernel_wait+0xd3/0x1c0 kernel/exit.c:1769
                        call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
                        call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:166
                        process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
                        worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
                        kthread+0x436/0x520 kernel/kthread.c:334
                        ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
     SOFTIRQ-ON-R at:
                        lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                        __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
                        _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
                        do_wait+0x293/0xac0 kernel/exit.c:1579
                        kernel_wait+0xd3/0x1c0 kernel/exit.c:1769
                        call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
                        call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:166
                        process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
                        worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
                        kthread+0x436/0x520 kernel/kthread.c:334
                        ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
     INITIAL USE at:
                       lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                       __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline]
                       _raw_write_lock_irq+0xab/0xf0 kernel/locking/spinlock.c:316
                       copy_process+0x236f/0x3e20 kernel/fork.c:2412
                       kernel_clone+0x23f/0x990 kernel/fork.c:2679
                       kernel_thread+0xfa/0x160 kernel/fork.c:2731
                       rest_init+0x21/0x330 init/main.c:720
                       start_kernel+0x489/0x540 init/main.c:1154
                       secondary_startup_64_no_verify+0xb1/0xbb
     INITIAL READ USE at:
                            lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                            __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
                            _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
                            do_wait+0x293/0xac0 kernel/exit.c:1579
                            kernel_wait+0xd3/0x1c0 kernel/exit.c:1769
                            call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
                            call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:166
                            process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
                            worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
                            kthread+0x436/0x520 kernel/kthread.c:334
                            ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
   }
   ... key      at: [<ffffffff8c00a058>] tasklist_lock+0x18/0x40
   ... acquired at:
   __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
   _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
   send_sigio+0xd2/0x330 fs/fcntl.c:804
   kill_fasync_rcu fs/fcntl.c:1015 [inline]
   kill_fasync+0x20a/0x490 fs/fcntl.c:1029
   lease_break_callback+0x22/0x30 fs/locks.c:613
   __break_lease+0x4a1/0x12b0 fs/locks.c:1615
   vfs_truncate+0x1fb/0x2f0 fs/open.c:105
   do_sys_truncate+0xf2/0x1c0 fs/open.c:134
   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
   do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
   entry_SYSCALL_64_after_hwframe+0x66/0xd0

 -> (&f->f_owner.lock){...-}-{2:2} {
    IN-SOFTIRQ-R at:
                      lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                      __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
                      _raw_read_lock_irqsave+0xb8/0x100 kernel/locking/spinlock.c:236
                      send_sigurg+0x25/0x390 fs/fcntl.c:829
                      sk_send_sigurg+0x6b/0xc0 net/core/sock.c:3137
                      tcp_check_urg net/ipv4/tcp_input.c:5688 [inline]
                      tcp_urg+0x2bc/0xb20 net/ipv4/tcp_input.c:5729
                      tcp_rcv_established+0xac2/0x1ce0 net/ipv4/tcp_input.c:6063
                      tcp_v4_do_rcv+0x44b/0x9b0 net/ipv4/tcp_ipv4.c:1731
                      tcp_v4_rcv+0x26d8/0x2d10 net/ipv4/tcp_ipv4.c:2143
                      ip_protocol_deliver_rcu+0x3ad/0x770 net/ipv4/ip_input.c:204
                      ip_local_deliver_finish+0x1d5/0x320 net/ipv4/ip_input.c:231
                      NF_HOOK+0x303/0x390 include/linux/netfilter.h:302
                      NF_HOOK+0x303/0x390 include/linux/netfilter.h:302
                      __netif_receive_skb_one_core net/core/dev.c:5538 [inline]
                      __netif_receive_skb+0xcc/0x290 net/core/dev.c:5652
                      process_backlog+0x370/0x790 net/core/dev.c:6529
                      __napi_poll+0xc0/0x430 net/core/dev.c:7088
                      napi_poll net/core/dev.c:7155 [inline]
                      net_rx_action+0x4d4/0xa10 net/core/dev.c:7245
                      handle_softirqs+0x339/0x830 kernel/softirq.c:576
                      run_ksoftirqd+0xa4/0x100 kernel/softirq.c:943
                      smpboot_thread_fn+0x4f6/0x970 kernel/smpboot.c:164
                      kthread+0x436/0x520 kernel/kthread.c:334
                      ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
    INITIAL USE at:
                     lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                     __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline]
                     _raw_write_lock_irq+0xab/0xf0 kernel/locking/spinlock.c:316
                     __f_setown+0x37/0x330 fs/fcntl.c:91
                     generic_add_lease fs/locks.c:1900 [inline]
                     generic_setlease+0xec1/0x12f0 fs/locks.c:1980
                     vfs_setlease fs/locks.c:2070 [inline]
                     do_fcntl_add_lease fs/locks.c:2091 [inline]
                     fcntl_setlease+0x262/0x330 fs/locks.c:2113
                     do_fcntl+0x11a/0x1360 fs/fcntl.c:413
                     __do_sys_fcntl fs/fcntl.c:466 [inline]
                     __se_sys_fcntl+0xcc/0x190 fs/fcntl.c:451
                     do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                     do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
                     entry_SYSCALL_64_after_hwframe+0x66/0xd0
    INITIAL READ USE at:
                          lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                          __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
                          _raw_read_lock_irqsave+0xb8/0x100 kernel/locking/spinlock.c:236
                          send_sigurg+0x25/0x390 fs/fcntl.c:829
                          sk_send_sigurg+0x6b/0xc0 net/core/sock.c:3137
                          tcp_check_urg net/ipv4/tcp_input.c:5688 [inline]
                          tcp_urg+0x2bc/0xb20 net/ipv4/tcp_input.c:5729
                          tcp_rcv_established+0xac2/0x1ce0 net/ipv4/tcp_input.c:6063
                          tcp_v4_do_rcv+0x44b/0x9b0 net/ipv4/tcp_ipv4.c:1731
                          sk_backlog_rcv include/net/sock.h:1080 [inline]
                          __release_sock+0x1e1/0x450 net/core/sock.c:2731
                          release_sock+0x5b/0x1b0 net/core/sock.c:3274
                          tcp_sendmsg+0x35/0x40 net/ipv4/tcp.c:1458
                          sock_sendmsg_nosec net/socket.c:706 [inline]
                          __sock_sendmsg net/socket.c:718 [inline]
                          __sys_sendto+0x46d/0x620 net/socket.c:2072
                          __do_sys_sendto net/socket.c:2084 [inline]
                          __se_sys_sendto net/socket.c:2080 [inline]
                          __x64_sys_sendto+0xda/0xf0 net/socket.c:2080
                          do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                          do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
                          entry_SYSCALL_64_after_hwframe+0x66/0xd0
  }
  ... key      at: [<ffffffff9633fb00>] __alloc_file.__key+0x0/0x10
  ... acquired at:
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
   _raw_read_lock_irqsave+0xb8/0x100 kernel/locking/spinlock.c:236
   send_sigio+0x2f/0x330 fs/fcntl.c:790
   kill_fasync_rcu fs/fcntl.c:1015 [inline]
   kill_fasync+0x20a/0x490 fs/fcntl.c:1029
   lease_break_callback+0x22/0x30 fs/locks.c:613
   __break_lease+0x4a1/0x12b0 fs/locks.c:1615
   vfs_truncate+0x1fb/0x2f0 fs/open.c:105
   do_sys_truncate+0xf2/0x1c0 fs/open.c:134
   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
   do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
   entry_SYSCALL_64_after_hwframe+0x66/0xd0

-> (&new->fa_lock){....}-{2:2} {
   INITIAL USE at:
                   lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline]
                   _raw_write_lock_irq+0xab/0xf0 kernel/locking/spinlock.c:316
                   fasync_remove_entry+0xf0/0x1c0 fs/fcntl.c:885
                   lease_modify+0x1a2/0x390 fs/locks.c:1480
                   locks_remove_lease fs/locks.c:2720 [inline]
                   locks_remove_file+0x52f/0xec0 fs/locks.c:2745
                   __fput+0x18d/0x930 fs/file_table.c:303
                   task_work_run+0x125/0x1a0 kernel/task_work.c:188
                   exit_task_work include/linux/task_work.h:33 [inline]
                   do_exit+0x626/0x20c0 kernel/exit.c:883
                   do_group_exit+0x12e/0x300 kernel/exit.c:997
                   get_signal+0x6ca/0x12c0 kernel/signal.c:2900
                   arch_do_signal_or_restart+0xe7/0x12c0 arch/x86/kernel/signal.c:867
                   handle_signal_work kernel/entry/common.c:154 [inline]
                   exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
                   exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
                   irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:320
                   asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:681
   INITIAL READ USE at:
                        lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                        __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
                        _raw_read_lock_irqsave+0xb8/0x100 kernel/locking/spinlock.c:236
                        kill_fasync_rcu fs/fcntl.c:1008 [inline]
                        kill_fasync+0x16d/0x490 fs/fcntl.c:1029
                        lease_break_callback+0x22/0x30 fs/locks.c:613
                        __break_lease+0x4a1/0x12b0 fs/locks.c:1615
                        vfs_truncate+0x1fb/0x2f0 fs/open.c:105
                        do_sys_truncate+0xf2/0x1c0 fs/open.c:134
                        do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                        do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
                        entry_SYSCALL_64_after_hwframe+0x66/0xd0
 }
 ... key      at: [<ffffffff96340780>] fasync_insert_entry.__key+0x0/0x20
 ... acquired at:
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
   _raw_read_lock_irqsave+0xb8/0x100 kernel/locking/spinlock.c:236
   kill_fasync_rcu fs/fcntl.c:1008 [inline]
   kill_fasync+0x16d/0x490 fs/fcntl.c:1029
   __pass_event drivers/input/evdev.c:240 [inline]
   evdev_pass_values+0x54b/0xab0 drivers/input/evdev.c:278
   evdev_events+0x1c0/0x2f0 drivers/input/evdev.c:306
   input_to_handler drivers/input/input.c:126 [inline]
   input_pass_values+0x87e/0x1210 drivers/input/input.c:156
   input_handle_event+0xb3f/0x1490 drivers/input/input.c:415
   input_inject_event+0x1b9/0x2c0 drivers/input/input.c:487
   evdev_write+0x35b/0x490 drivers/input/evdev.c:530
   vfs_write+0x30b/0xd60 fs/read_write.c:592
   ksys_write+0x152/0x260 fs/read_write.c:647
   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
   do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
   entry_SYSCALL_64_after_hwframe+0x66/0xd0


stack backtrace:
CPU: 1 PID: 10383 Comm: syz.5.1186 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 print_bad_irq_dependency kernel/locking/lockdep.c:2567 [inline]
 check_irq_usage kernel/locking/lockdep.c:2806 [inline]
 check_prev_add kernel/locking/lockdep.c:3057 [inline]
 check_prevs_add kernel/locking/lockdep.c:3172 [inline]
 validate_chain kernel/locking/lockdep.c:3788 [inline]
 __lock_acquire+0x6688/0x7d10 kernel/locking/lockdep.c:5012
 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
 _raw_read_lock_irqsave+0xb8/0x100 kernel/locking/spinlock.c:236
 kill_fasync_rcu fs/fcntl.c:1008 [inline]
 kill_fasync+0x16d/0x490 fs/fcntl.c:1029
 __pass_event drivers/input/evdev.c:240 [inline]
 evdev_pass_values+0x54b/0xab0 drivers/input/evdev.c:278
 evdev_events+0x1c0/0x2f0 drivers/input/evdev.c:306
 input_to_handler drivers/input/input.c:126 [inline]
 input_pass_values+0x87e/0x1210 drivers/input/input.c:156
 input_handle_event+0xb3f/0x1490 drivers/input/input.c:415
 input_inject_event+0x1b9/0x2c0 drivers/input/input.c:487
 evdev_write+0x35b/0x490 drivers/input/evdev.c:530
 vfs_write+0x30b/0xd60 fs/read_write.c:592
 ksys_write+0x152/0x260 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f79aecaef79
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:00007f79acf09028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f79aef28fa0 RCX: 00007f79aecaef79
RDX: 0000000000000037 RSI: 0000200000000040 RDI: 0000000000000003
RBP: 00007f79aed457e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f79aef29038 R14: 00007f79aef28fa0 R15: 00007fff42d8ccd8
 </TASK>

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/02/10 17:51 linux-5.15.y 7b232985052f 91d776d3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan possible deadlock in evdev_pass_values
2026/01/20 01:32 linux-5.15.y 9eec9a14ee10 572effc1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan possible deadlock in evdev_pass_values
2025/10/15 11:53 linux-5.15.y 29e53a5b1c4f b6605ba8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan possible deadlock in evdev_pass_values
2025/08/30 02:16 linux-5.15.y 01879f56bdde 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan possible deadlock in evdev_pass_values
2025/08/26 05:45 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan possible deadlock in evdev_pass_values
* Struck through repros no longer work on HEAD.