possible deadlock in evdev_pass_values (4)

Status: auto-obsoleted due to no activity on 2025/05/14 14:17
Reported-by: syzbot+806557a798f28c6c8bf1@syzkaller.appspotmail.com
First crash: 561d, last: 550d
▶ ▼ Similar bugs (12)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream possible deadlock in evdev_pass_values fuse kernfs 4 351 1213d 2036d 0/29 closed as dup on 2021/07/02 09:55
linux-5.15 possible deadlock in evdev_pass_values (3) 4 11 710d 743d 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 795d 862d 0/3 auto-obsoleted due to no activity on 2024/08/12 15:10
linux-6.1 possible deadlock in evdev_pass_values 4 1 1133d 1133d 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 365d 374d 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 1010d 1114d 0/3 auto-obsoleted due to no activity on 2024/02/09 07:09
upstream possible deadlock in evdev_pass_values (2) input prio:high 4 2096 53d 1204d 0/29 upstream: reported on 2023/04/21 09:42
linux-6.1 possible deadlock in evdev_pass_values (4) 4 12 296d 491d 0/3 auto-obsoleted due to no activity on 2026/01/23 14:28
linux-6.6 possible deadlock in evdev_pass_values (2) 4 4 132d 148d 0/2 auto-obsoleted due to no activity on 2026/07/06 05:14
linux-5.15 possible deadlock in evdev_pass_values (2) 4 22 829d 906d 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 994d 994d 0/3 auto-obsoleted due to no activity on 2024/02/25 22:49
linux-5.15 possible deadlock in evdev_pass_values (5) 4 10 95d 346d 0/3 upstream: reported on 2025/08/26 05:46

Sample crash report:
=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
5.15.178-syzkaller #0 Not tainted
-----------------------------------------------------
syz.0.1742/10287 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffffffff8c80a058 (tasklist_lock){.+.+}-{2:2}, at: send_sigurg+0xc8/0x380 fs/fcntl.c:845

and this task is already holding:
ffff88806706f2b8 (&f->f_owner.lock){....}-{2:2}, at: send_sigurg+0x25/0x380 fs/fcntl.c:829
which would create a new lock dependency:
 (&f->f_owner.lock){....}-{2:2} -> (tasklist_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+0x1db/0x4f0 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:363 [inline]
  evdev_pass_values+0xe7/0xb60 drivers/input/evdev.c:261
  evdev_events+0x198/0x2c0 drivers/input/evdev.c:306
  input_to_handler drivers/input/input.c:126 [inline]
  input_pass_values+0x873/0x1200 drivers/input/input.c:156
  input_handle_event+0xd3d/0x1600 drivers/input/input.c:426
  input_inject_event+0x1fc/0x300 drivers/input/input.c:487
  kd_sound_helper+0x19c/0x200 drivers/tty/vt/keyboard.c:260
  input_handler_for_each_handle+0xd5/0x190 drivers/input/input.c:2556
  call_timer_fn+0x16d/0x560 kernel/time/timer.c:1451
  expire_timers kernel/time/timer.c:1496 [inline]
  __run_timers+0x67c/0x890 kernel/time/timer.c:1767
  run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
  handle_softirqs+0x3a7/0x930 kernel/softirq.c:558
  __do_softirq kernel/softirq.c:592 [inline]
  invoke_softirq kernel/softirq.c:432 [inline]
  __irq_exit_rcu+0x157/0x240 kernel/softirq.c:641
  irq_exit_rcu+0x5/0x20 kernel/softirq.c:653
  instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
  sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
  asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
  __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
  _raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
  spin_unlock_irq include/linux/spinlock.h:413 [inline]
  shmem_add_to_page_cache+0x12aa/0x17c0 mm/shmem.c:752
  shmem_getpage_gfp+0x1aa1/0x3190 mm/shmem.c:1940
  shmem_getpage mm/shmem.c:151 [inline]
  shmem_write_begin+0xce/0x1a0 mm/shmem.c:2474
  generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3785
  __generic_file_write_iter+0x243/0x4f0 mm/filemap.c:3912
  generic_file_write_iter+0xa7/0x1b0 mm/filemap.c:3944
  call_write_iter include/linux/fs.h:2174 [inline]
  new_sync_write fs/read_write.c:507 [inline]
  vfs_write+0xacd/0xe50 fs/read_write.c:594
  ksys_write+0x1a2/0x2c0 fs/read_write.c:647
  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
  do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
  entry_SYSCALL_64_after_hwframe+0x66/0xd0

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

... which became SOFTIRQ-irq-unsafe at:
...
  lock_acquire+0x1db/0x4f0 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+0x2a7/0xaf0 kernel/exit.c:1578
  kernel_wait+0xe5/0x230 kernel/exit.c:1768
  call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
  call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:166
  process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
  worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
  kthread+0x3f6/0x4f0 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 --> &f->f_owner.lock --> tasklist_lock

 Possible interrupt unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(tasklist_lock);
                               local_irq_disable();
                               lock(&client->buffer_lock);
                               lock(&f->f_owner.lock);
  <Interrupt>
    lock(&client->buffer_lock);

 *** DEADLOCK ***

2 locks held by syz.0.1742/10287:
 #0: ffff88807cafb420 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1684 [inline]
 #0: ffff88807cafb420 (sk_lock-AF_INET6){+.+.}-{0:0}, at: tcp_sendmsg+0x1e/0x40 net/ipv4/tcp.c:1456
 #1: ffff88806706f2b8 (&f->f_owner.lock){....}-{2:2}, at: send_sigurg+0x25/0x380 fs/fcntl.c:829

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
  -> (&client->buffer_lock){..-.}-{2:2} {
     IN-SOFTIRQ-W at:
                        lock_acquire+0x1db/0x4f0 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:363 [inline]
                        evdev_pass_values+0xe7/0xb60 drivers/input/evdev.c:261
                        evdev_events+0x198/0x2c0 drivers/input/evdev.c:306
                        input_to_handler drivers/input/input.c:126 [inline]
                        input_pass_values+0x873/0x1200 drivers/input/input.c:156
                        input_handle_event+0xd3d/0x1600 drivers/input/input.c:426
                        input_inject_event+0x1fc/0x300 drivers/input/input.c:487
                        kd_sound_helper+0x19c/0x200 drivers/tty/vt/keyboard.c:260
                        input_handler_for_each_handle+0xd5/0x190 drivers/input/input.c:2556
                        call_timer_fn+0x16d/0x560 kernel/time/timer.c:1451
                        expire_timers kernel/time/timer.c:1496 [inline]
                        __run_timers+0x67c/0x890 kernel/time/timer.c:1767
                        run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
                        handle_softirqs+0x3a7/0x930 kernel/softirq.c:558
                        __do_softirq kernel/softirq.c:592 [inline]
                        invoke_softirq kernel/softirq.c:432 [inline]
                        __irq_exit_rcu+0x157/0x240 kernel/softirq.c:641
                        irq_exit_rcu+0x5/0x20 kernel/softirq.c:653
                        instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
                        sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
                        asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
                        __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
                        _raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
                        spin_unlock_irq include/linux/spinlock.h:413 [inline]
                        shmem_add_to_page_cache+0x12aa/0x17c0 mm/shmem.c:752
                        shmem_getpage_gfp+0x1aa1/0x3190 mm/shmem.c:1940
                        shmem_getpage mm/shmem.c:151 [inline]
                        shmem_write_begin+0xce/0x1a0 mm/shmem.c:2474
                        generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3785
                        __generic_file_write_iter+0x243/0x4f0 mm/filemap.c:3912
                        generic_file_write_iter+0xa7/0x1b0 mm/filemap.c:3944
                        call_write_iter include/linux/fs.h:2174 [inline]
                        new_sync_write fs/read_write.c:507 [inline]
                        vfs_write+0xacd/0xe50 fs/read_write.c:594
                        ksys_write+0x1a2/0x2c0 fs/read_write.c:647
                        do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                        do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
                        entry_SYSCALL_64_after_hwframe+0x66/0xd0
     INITIAL USE at:
                       lock_acquire+0x1db/0x4f0 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:363 [inline]
                       evdev_pass_values+0xe7/0xb60 drivers/input/evdev.c:261
                       evdev_events+0x198/0x2c0 drivers/input/evdev.c:306
                       input_to_handler drivers/input/input.c:126 [inline]
                       input_pass_values+0x873/0x1200 drivers/input/input.c:156
                       input_handle_event+0xc9b/0x1600 drivers/input/input.c:415
                       input_inject_event+0x1fc/0x300 drivers/input/input.c:487
                       evdev_write+0x668/0x7c0 drivers/input/evdev.c:530
                       vfs_write+0x30c/0xe50 fs/read_write.c:592
                       ksys_write+0x1a2/0x2c0 fs/read_write.c:647
                       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                       do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
                       entry_SYSCALL_64_after_hwframe+0x66/0xd0
   }
   ... key      at: [<ffffffff96df5f40>] evdev_open.__key.23+0x0/0x20
 -> (&new->fa_lock){....}-{2:2} {
    INITIAL USE at:
                     lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
                     __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline]
                     _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:316
                     fasync_remove_entry+0xfb/0x1d0 fs/fcntl.c:885
                     __fput+0x766/0x8e0 fs/file_table.c:277
                     task_work_run+0x129/0x1a0 kernel/task_work.c:188
                     tracehook_notify_resume include/linux/tracehook.h:189 [inline]
                     exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:181
                     exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
                     __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
                     syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307
                     do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
                     entry_SYSCALL_64_after_hwframe+0x66/0xd0
    INITIAL READ USE at:
                          lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
                          __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
                          _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236
                          kill_fasync_rcu fs/fcntl.c:1008 [inline]
                          kill_fasync+0x16a/0x490 fs/fcntl.c:1029
                          __pass_event drivers/input/evdev.c:240 [inline]
                          evdev_pass_values+0x5ad/0xb60 drivers/input/evdev.c:278
                          evdev_events+0x198/0x2c0 drivers/input/evdev.c:306
                          input_to_handler drivers/input/input.c:126 [inline]
                          input_pass_values+0x873/0x1200 drivers/input/input.c:156
                          input_handle_event+0xc9b/0x1600 drivers/input/input.c:415
                          input_inject_event+0x1fc/0x300 drivers/input/input.c:487
                          evdev_write+0x668/0x7c0 drivers/input/evdev.c:530
                          vfs_write+0x30c/0xe50 fs/read_write.c:592
                          ksys_write+0x1a2/0x2c0 fs/read_write.c:647
                          do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                          do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
                          entry_SYSCALL_64_after_hwframe+0x66/0xd0
  }
  ... key      at: [<ffffffff96afa980>] fasync_insert_entry.__key+0x0/0x20
  ... acquired at:
   lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
   _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236
   kill_fasync_rcu fs/fcntl.c:1008 [inline]
   kill_fasync+0x16a/0x490 fs/fcntl.c:1029
   __pass_event drivers/input/evdev.c:240 [inline]
   evdev_pass_values+0x5ad/0xb60 drivers/input/evdev.c:278
   evdev_events+0x198/0x2c0 drivers/input/evdev.c:306
   input_to_handler drivers/input/input.c:126 [inline]
   input_pass_values+0x873/0x1200 drivers/input/input.c:156
   input_handle_event+0xc9b/0x1600 drivers/input/input.c:415
   input_inject_event+0x1fc/0x300 drivers/input/input.c:487
   evdev_write+0x668/0x7c0 drivers/input/evdev.c:530
   vfs_write+0x30c/0xe50 fs/read_write.c:592
   ksys_write+0x1a2/0x2c0 fs/read_write.c:647
   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
   do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
   entry_SYSCALL_64_after_hwframe+0x66/0xd0

-> (&f->f_owner.lock){....}-{2:2} {
   INITIAL USE at:
                   lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline]
                   _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:316
                   __f_setown+0x38/0x350 fs/fcntl.c:91
                   generic_add_lease fs/locks.c:1900 [inline]
                   generic_setlease+0xf12/0x1390 fs/locks.c:1980
                   vfs_setlease fs/locks.c:2070 [inline]
                   do_fcntl_add_lease fs/locks.c:2091 [inline]
                   fcntl_setlease+0x341/0x3f0 fs/locks.c:2113
                   do_fcntl+0x10a/0x1600 fs/fcntl.c:413
                   __do_sys_fcntl fs/fcntl.c:466 [inline]
                   __se_sys_fcntl+0xd8/0x1b0 fs/fcntl.c:451
                   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                   do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
                   entry_SYSCALL_64_after_hwframe+0x66/0xd0
   INITIAL READ USE at:
                        lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
                        __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
                        _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236
                        send_sigio+0x2f/0x330 fs/fcntl.c:790
                        kill_fasync_rcu fs/fcntl.c:1015 [inline]
                        kill_fasync+0x20c/0x490 fs/fcntl.c:1029
                        __pass_event drivers/input/evdev.c:240 [inline]
                        evdev_pass_values+0x5ad/0xb60 drivers/input/evdev.c:278
                        evdev_events+0x198/0x2c0 drivers/input/evdev.c:306
                        input_to_handler drivers/input/input.c:126 [inline]
                        input_pass_values+0x873/0x1200 drivers/input/input.c:156
                        input_handle_event+0xc9b/0x1600 drivers/input/input.c:415
                        input_inject_event+0x1fc/0x300 drivers/input/input.c:487
                        evdev_write+0x668/0x7c0 drivers/input/evdev.c:530
                        vfs_write+0x30c/0xe50 fs/read_write.c:592
                        ksys_write+0x1a2/0x2c0 fs/read_write.c:647
                        do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                        do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
                        entry_SYSCALL_64_after_hwframe+0x66/0xd0
 }
 ... key      at: [<ffffffff96af9d00>] __alloc_file.__key+0x0/0x10
 ... acquired at:
   lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
   _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236
   send_sigio+0x2f/0x330 fs/fcntl.c:790
   kill_fasync_rcu fs/fcntl.c:1015 [inline]
   kill_fasync+0x20c/0x490 fs/fcntl.c:1029
   __pass_event drivers/input/evdev.c:240 [inline]
   evdev_pass_values+0x5ad/0xb60 drivers/input/evdev.c:278
   evdev_events+0x198/0x2c0 drivers/input/evdev.c:306
   input_to_handler drivers/input/input.c:126 [inline]
   input_pass_values+0x873/0x1200 drivers/input/input.c:156
   input_handle_event+0xc9b/0x1600 drivers/input/input.c:415
   input_inject_event+0x1fc/0x300 drivers/input/input.c:487
   evdev_write+0x668/0x7c0 drivers/input/evdev.c:530
   vfs_write+0x30c/0xe50 fs/read_write.c:592
   ksys_write+0x1a2/0x2c0 fs/read_write.c:647
   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
   do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
   entry_SYSCALL_64_after_hwframe+0x66/0xd0


the dependencies between the lock to be acquired
 and SOFTIRQ-irq-unsafe lock:
-> (tasklist_lock){.+.+}-{2:2} {
   HARDIRQ-ON-R at:
                    lock_acquire+0x1db/0x4f0 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+0x2a7/0xaf0 kernel/exit.c:1578
                    kernel_wait+0xe5/0x230 kernel/exit.c:1768
                    call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
                    call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:166
                    process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
                    worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
                    kthread+0x3f6/0x4f0 kernel/kthread.c:334
                    ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
   SOFTIRQ-ON-R at:
                    lock_acquire+0x1db/0x4f0 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+0x2a7/0xaf0 kernel/exit.c:1578
                    kernel_wait+0xe5/0x230 kernel/exit.c:1768
                    call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
                    call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:166
                    process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
                    worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
                    kthread+0x3f6/0x4f0 kernel/kthread.c:334
                    ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
   INITIAL USE at:
                   lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline]
                   _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:316
                   copy_process+0x22be/0x3ef0 kernel/fork.c:2336
                   kernel_clone+0x210/0x960 kernel/fork.c:2603
                   kernel_thread+0x168/0x1e0 kernel/fork.c:2655
                   rest_init+0x21/0x330 init/main.c:706
                   start_kernel+0x48c/0x540 init/main.c:1140
                   secondary_startup_64_no_verify+0xb1/0xbb
   INITIAL READ USE at:
                        lock_acquire+0x1db/0x4f0 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+0x2a7/0xaf0 kernel/exit.c:1578
                        kernel_wait+0xe5/0x230 kernel/exit.c:1768
                        call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
                        call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:166
                        process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
                        worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
                        kthread+0x3f6/0x4f0 kernel/kthread.c:334
                        ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 }
 ... key      at: [<ffffffff8c80a058>] tasklist_lock+0x18/0x40
 ... acquired at:
   lock_acquire+0x1db/0x4f0 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
   send_sigurg+0xc8/0x380 fs/fcntl.c:845
   sk_send_sigurg+0x6a/0xb0 net/core/sock.c:3131
   tcp_check_urg net/ipv4/tcp_input.c:5672 [inline]
   tcp_urg+0x2b8/0xb40 net/ipv4/tcp_input.c:5713
   tcp_rcv_established+0xe33/0x1e20 net/ipv4/tcp_input.c:6047
   tcp_v6_do_rcv+0x528/0x1120 net/ipv6/tcp_ipv6.c:1526
   sk_backlog_rcv include/net/sock.h:1061 [inline]
   __release_sock+0x198/0x4b0 net/core/sock.c:2727
   release_sock+0x5d/0x1c0 net/core/sock.c:3268
   tcp_sendmsg+0x36/0x40 net/ipv4/tcp.c:1458
   sock_sendmsg_nosec net/socket.c:704 [inline]
   __sock_sendmsg net/socket.c:716 [inline]
   __sys_sendto+0x564/0x720 net/socket.c:2063
   __do_sys_sendto net/socket.c:2075 [inline]
   __se_sys_sendto net/socket.c:2071 [inline]
   __x64_sys_sendto+0xda/0xf0 net/socket.c:2071
   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
   do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
   entry_SYSCALL_64_after_hwframe+0x66/0xd0


stack backtrace:
CPU: 0 PID: 10287 Comm: syz.0.1742 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 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+0x4d01/0x5930 kernel/locking/lockdep.c:3788
 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
 lock_acquire+0x1db/0x4f0 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
 send_sigurg+0xc8/0x380 fs/fcntl.c:845
 sk_send_sigurg+0x6a/0xb0 net/core/sock.c:3131
 tcp_check_urg net/ipv4/tcp_input.c:5672 [inline]
 tcp_urg+0x2b8/0xb40 net/ipv4/tcp_input.c:5713
 tcp_rcv_established+0xe33/0x1e20 net/ipv4/tcp_input.c:6047
 tcp_v6_do_rcv+0x528/0x1120 net/ipv6/tcp_ipv6.c:1526
 sk_backlog_rcv include/net/sock.h:1061 [inline]
 __release_sock+0x198/0x4b0 net/core/sock.c:2727
 release_sock+0x5d/0x1c0 net/core/sock.c:3268
 tcp_sendmsg+0x36/0x40 net/ipv4/tcp.c:1458
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x564/0x720 net/socket.c:2063
 __do_sys_sendto net/socket.c:2075 [inline]
 __se_sys_sendto net/socket.c:2071 [inline]
 __x64_sys_sendto+0xda/0xf0 net/socket.c:2071
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fb146530da9
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:00007fb14439a038 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fb146749fa0 RCX: 00007fb146530da9
RDX: 0000000000000001 RSI: 0000000020000080 RDI: 0000000000000003
RBP: 00007fb1465b22a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb146749fa0 R15: 00007fff9adeda38
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/02/03 14:16 linux-5.15.y c16c81c81336 a21a8419 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan possible deadlock in evdev_pass_values
2025/01/23 21:19 linux-5.15.y 003148680b79 521b0ce3 .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.