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possible deadlock in evdev_pass_values (4)

Status: upstream: reported on 2025/04/03 09:00
Reported-by: syzbot+e8b0e2971a80f5f7b6c9@syzkaller.appspotmail.com
First crash: 66d, last: 53d
▶ ▼ Similar bugs (9)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream possible deadlock in evdev_pass_values fuse kernfs 351 787d 1610d 0/28 closed as dup on 2021/07/02 09:55
linux-5.15 possible deadlock in evdev_pass_values (3) 11 284d 317d 0/3 auto-obsoleted due to no activity on 2024/11/05 23:17
linux-6.1 possible deadlock in evdev_pass_values (3) 17 369d 436d 0/3 auto-obsoleted due to no activity on 2024/08/12 15:10
linux-5.15 possible deadlock in evdev_pass_values (4) 2 124d 135d 0/3 auto-obsoleted due to no activity on 2025/05/14 14:17
linux-6.1 possible deadlock in evdev_pass_values 1 707d 707d 0/3 auto-obsoleted due to no activity on 2023/10/09 19:52
linux-5.15 possible deadlock in evdev_pass_values 6 585d 688d 0/3 auto-obsoleted due to no activity on 2024/02/09 07:09
upstream possible deadlock in evdev_pass_values (2) input 1178 3d01h 779d 0/28 upstream: reported on 2023/04/21 09:42
linux-5.15 possible deadlock in evdev_pass_values (2) 22 403d 480d 0/3 auto-obsoleted due to no activity on 2024/07/10 03:27
linux-6.1 possible deadlock in evdev_pass_values (2) 1 568d 568d 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
6.1.134-syzkaller #0 Not tainted
-----------------------------------------------------
syz.1.4609/17144 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffffffff8d00a058 (tasklist_lock){.+.+}-{2:2}, at: send_sigio+0xf8/0x360 fs/fcntl.c:784

and this task is already holding:
ffff8880245c23b0 (&f->f_owner.lock){...-}-{2:2}, at: send_sigio+0x2f/0x360 fs/fcntl.c:770
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+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
  __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
  _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
  spin_lock include/linux/spinlock.h:351 [inline]
  evdev_pass_values+0xee/0xad0 drivers/input/evdev.c:261
  evdev_events+0x1be/0x2f0 drivers/input/evdev.c:306
  input_to_handler drivers/input/input.c:127 [inline]
  input_pass_values+0x8e0/0x12a0 drivers/input/input.c:159
  input_event_dispose+0x3fc/0x650 drivers/input/input.c:385
  input_handle_event+0x97d/0xb00 drivers/input/input.c:402
  input_event+0xa0/0xd0 drivers/input/input.c:431
  hidinput_hid_event+0x13e6/0x1d40 drivers/hid/hid-input.c:1710
  hid_process_event+0x433/0x580 drivers/hid/hid-core.c:1545
  hid_process_report drivers/hid/hid-core.c:1693 [inline]
  hid_report_raw_event+0xfc3/0x17e0 drivers/hid/hid-core.c:2020
  hid_input_report+0x420/0x4e0 drivers/hid/hid-core.c:2088
  hid_irq_in+0x45c/0x690 drivers/hid/usbhid/hid-core.c:284
  __usb_hcd_giveback_urb+0x371/0x530 drivers/usb/core/hcd.c:1675
  dummy_timer+0x8dc/0x32b0 drivers/usb/gadget/udc/dummy_hcd.c:1994
  __run_hrtimer kernel/time/hrtimer.c:1691 [inline]
  __hrtimer_run_queues+0x5e5/0xe50 kernel/time/hrtimer.c:1755
  hrtimer_run_softirq+0x196/0x2c0 kernel/time/hrtimer.c:1772
  handle_softirqs+0x2ee/0xa40 kernel/softirq.c:578
  __do_softirq kernel/softirq.c:612 [inline]
  invoke_softirq kernel/softirq.c:452 [inline]
  __irq_exit_rcu+0x157/0x240 kernel/softirq.c:661
  irq_exit_rcu+0x5/0x20 kernel/softirq.c:673
  instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
  sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
  asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
  __sanitizer_cov_trace_const_cmp4+0x0/0x80
  mt_locked lib/maple_tree.c:807 [inline]
  mt_slot lib/maple_tree.c:814 [inline]
  mas_slot lib/maple_tree.c:847 [inline]
  mas_next_nentry lib/maple_tree.c:4750 [inline]
  mas_next_entry+0x953/0xfb0 lib/maple_tree.c:4837
  validate_mm_mt+0x25c/0x670 mm/mmap.c:295
  validate_mm+0x16e/0x380 mm/mmap.c:331
  remove_mt mm/mmap.c:2310 [inline]
  do_mas_align_munmap+0x12c9/0x15a0 mm/mmap.c:2583
  do_mas_munmap+0x246/0x2b0 mm/mmap.c:2638
  __vm_munmap+0x268/0x370 mm/mmap.c:2924
  __do_sys_munmap mm/mmap.c:2949 [inline]
  __se_sys_munmap mm/mmap.c:2946 [inline]
  __x64_sys_munmap+0x5c/0x70 mm/mmap.c:2946
  do_syscall_x64 arch/x86/entry/common.c:51 [inline]
  do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
  entry_SYSCALL_64_after_hwframe+0x68/0xd2

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

... which became SOFTIRQ-irq-unsafe at:
...
  lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
  __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
  _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
  do_wait+0x2c6/0xb80 kernel/exit.c:1604
  kernel_wait+0xe5/0x230 kernel/exit.c:1794
  call_usermodehelper_exec_sync kernel/umh.c:140 [inline]
  call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:167
  process_one_work+0x917/0x1260 kernel/workqueue.c:2292
  worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
  kthread+0x28d/0x320 kernel/kthread.c:376
  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

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 ***

5 locks held by syz.1.4609/17144:
 #0: ffffffff8d32e7c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #0: ffffffff8d32e7c0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #0: ffffffff8d32e7c0 (rcu_read_lock){....}-{1:2}, at: sock_def_readable+0x1d/0x280 net/core/sock.c:3305
 #1: ffffffff8d32e7c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #1: ffffffff8d32e7c0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #1: ffffffff8d32e7c0 (rcu_read_lock){....}-{1:2}, at: sk_wake_async+0x86/0x280 include/net/sock.h:2591
 #2: ffffffff8d32e7c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #2: ffffffff8d32e7c0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #2: ffffffff8d32e7c0 (rcu_read_lock){....}-{1:2}, at: kill_fasync+0x51/0x4d0 fs/fcntl.c:1008
 #3: ffff888030290210 (&new->fa_lock){....}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:988 [inline]
 #3: ffff888030290210 (&new->fa_lock){....}-{2:2}, at: kill_fasync+0x196/0x4d0 fs/fcntl.c:1009
 #4: ffff8880245c23b0 (&f->f_owner.lock){...-}-{2:2}, at: send_sigio+0x2f/0x360 fs/fcntl.c:770

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
  -> (&client->buffer_lock){..-.}-{2:2} {
     IN-SOFTIRQ-W at:
                        lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
                        __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
                        _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
                        spin_lock include/linux/spinlock.h:351 [inline]
                        evdev_pass_values+0xee/0xad0 drivers/input/evdev.c:261
                        evdev_events+0x1be/0x2f0 drivers/input/evdev.c:306
                        input_to_handler drivers/input/input.c:127 [inline]
                        input_pass_values+0x8e0/0x12a0 drivers/input/input.c:159
                        input_event_dispose+0x3fc/0x650 drivers/input/input.c:385
                        input_handle_event+0x97d/0xb00 drivers/input/input.c:402
                        input_event+0xa0/0xd0 drivers/input/input.c:431
                        hidinput_hid_event+0x13e6/0x1d40 drivers/hid/hid-input.c:1710
                        hid_process_event+0x433/0x580 drivers/hid/hid-core.c:1545
                        hid_process_report drivers/hid/hid-core.c:1693 [inline]
                        hid_report_raw_event+0xfc3/0x17e0 drivers/hid/hid-core.c:2020
                        hid_input_report+0x420/0x4e0 drivers/hid/hid-core.c:2088
                        hid_irq_in+0x45c/0x690 drivers/hid/usbhid/hid-core.c:284
                        __usb_hcd_giveback_urb+0x371/0x530 drivers/usb/core/hcd.c:1675
                        dummy_timer+0x8dc/0x32b0 drivers/usb/gadget/udc/dummy_hcd.c:1994
                        __run_hrtimer kernel/time/hrtimer.c:1691 [inline]
                        __hrtimer_run_queues+0x5e5/0xe50 kernel/time/hrtimer.c:1755
                        hrtimer_run_softirq+0x196/0x2c0 kernel/time/hrtimer.c:1772
                        handle_softirqs+0x2ee/0xa40 kernel/softirq.c:578
                        __do_softirq kernel/softirq.c:612 [inline]
                        invoke_softirq kernel/softirq.c:452 [inline]
                        __irq_exit_rcu+0x157/0x240 kernel/softirq.c:661
                        irq_exit_rcu+0x5/0x20 kernel/softirq.c:673
                        instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
                        sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
                        asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
                        __sanitizer_cov_trace_const_cmp4+0x0/0x80
                        mt_locked lib/maple_tree.c:807 [inline]
                        mt_slot lib/maple_tree.c:814 [inline]
                        mas_slot lib/maple_tree.c:847 [inline]
                        mas_next_nentry lib/maple_tree.c:4750 [inline]
                        mas_next_entry+0x953/0xfb0 lib/maple_tree.c:4837
                        validate_mm_mt+0x25c/0x670 mm/mmap.c:295
                        validate_mm+0x16e/0x380 mm/mmap.c:331
                        remove_mt mm/mmap.c:2310 [inline]
                        do_mas_align_munmap+0x12c9/0x15a0 mm/mmap.c:2583
                        do_mas_munmap+0x246/0x2b0 mm/mmap.c:2638
                        __vm_munmap+0x268/0x370 mm/mmap.c:2924
                        __do_sys_munmap mm/mmap.c:2949 [inline]
                        __se_sys_munmap mm/mmap.c:2946 [inline]
                        __x64_sys_munmap+0x5c/0x70 mm/mmap.c:2946
                        do_syscall_x64 arch/x86/entry/common.c:51 [inline]
                        do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
                        entry_SYSCALL_64_after_hwframe+0x68/0xd2
     INITIAL USE at:
                       lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
                       __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
                       _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
                       spin_lock include/linux/spinlock.h:351 [inline]
                       evdev_pass_values+0xee/0xad0 drivers/input/evdev.c:261
                       evdev_events+0x1be/0x2f0 drivers/input/evdev.c:306
                       input_to_handler drivers/input/input.c:127 [inline]
                       input_pass_values+0x8e0/0x12a0 drivers/input/input.c:159
                       input_event_dispose+0x366/0x650 drivers/input/input.c:374
                       input_handle_event+0x97d/0xb00 drivers/input/input.c:402
                       input_inject_event+0x224/0x330 drivers/input/input.c:461
                       evdev_write+0x668/0x7c0 drivers/input/evdev.c:530
                       vfs_write+0x2d9/0xbc0 fs/read_write.c:582
                       ksys_write+0x19c/0x2c0 fs/read_write.c:637
                       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
                       do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
                       entry_SYSCALL_64_after_hwframe+0x68/0xd2
   }
   ... key      at: [<ffffffff97785bc0>] evdev_open.__key.30+0x0/0x20
 -> (&new->fa_lock){....}-{2:2} {
    INITIAL USE at:
                     lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
                     __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
                     _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:326
                     fasync_remove_entry+0xfb/0x1d0 fs/fcntl.c:865
                     sock_fasync+0x86/0xf0 net/socket.c:1425
                     __fput+0x75e/0x8d0 fs/file_table.c:317
                     task_work_run+0x246/0x300 kernel/task_work.c:203
                     resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
                     exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:177
                     exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
                     __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
                     syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
                     do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
                     entry_SYSCALL_64_after_hwframe+0x68/0xd2
    INITIAL READ USE at:
                          lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
                          __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
                          _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236
                          kill_fasync_rcu fs/fcntl.c:988 [inline]
                          kill_fasync+0x196/0x4d0 fs/fcntl.c:1009
                          sock_wake_async+0x145/0x170 net/socket.c:-1
                          sk_wake_async+0x186/0x280 include/net/sock.h:2592
                          queue_oob+0x81a/0xaf0 net/unix/af_unix.c:2128
                          unix_stream_sendmsg+0xe10/0x1070 net/unix/af_unix.c:2228
                          sock_sendmsg_nosec net/socket.c:718 [inline]
                          __sock_sendmsg net/socket.c:730 [inline]
                          ____sys_sendmsg+0x5d3/0x9a0 net/socket.c:2519
                          ___sys_sendmsg net/socket.c:2573 [inline]
                          __sys_sendmmsg+0x3ab/0x730 net/socket.c:2659
                          __do_sys_sendmmsg net/socket.c:2688 [inline]
                          __se_sys_sendmmsg net/socket.c:2685 [inline]
                          __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2685
                          do_syscall_x64 arch/x86/entry/common.c:51 [inline]
                          do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
                          entry_SYSCALL_64_after_hwframe+0x68/0xd2
  }
  ... key      at: [<ffffffff9748d920>] fasync_insert_entry.__key+0x0/0x20
  ... acquired at:
   lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
   _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236
   kill_fasync_rcu fs/fcntl.c:988 [inline]
   kill_fasync+0x196/0x4d0 fs/fcntl.c:1009
   __pass_event drivers/input/evdev.c:240 [inline]
   evdev_pass_values+0x586/0xad0 drivers/input/evdev.c:278
   evdev_events+0x1be/0x2f0 drivers/input/evdev.c:306
   input_to_handler drivers/input/input.c:127 [inline]
   input_pass_values+0x8e0/0x12a0 drivers/input/input.c:159
   input_event_dispose+0x366/0x650 drivers/input/input.c:374
   input_handle_event+0x97d/0xb00 drivers/input/input.c:402
   input_inject_event+0x224/0x330 drivers/input/input.c:461
   evdev_write+0x668/0x7c0 drivers/input/evdev.c:530
   vfs_write+0x2d9/0xbc0 fs/read_write.c:582
   ksys_write+0x19c/0x2c0 fs/read_write.c:637
   do_syscall_x64 arch/x86/entry/common.c:51 [inline]
   do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
   entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> (&f->f_owner.lock){...-}-{2:2} {
   IN-SOFTIRQ-R at:
                    lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
                    __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
                    _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236
                    send_sigurg+0x25/0x3b0 fs/fcntl.c:809
                    sk_send_sigurg+0x6a/0xb0 net/core/sock.c:3366
                    tcp_check_urg+0x207/0x740 net/ipv4/tcp_input.c:5700
                    tcp_urg+0x154/0x440 net/ipv4/tcp_input.c:5741
                    tcp_rcv_established+0xe61/0x1e90 net/ipv4/tcp_input.c:6094
                    tcp_v4_do_rcv+0x487/0xb10 net/ipv4/tcp_ipv4.c:1683
                    tcp_v4_rcv+0x23c9/0x2c60 net/ipv4/tcp_ipv4.c:2114
                    ip_protocol_deliver_rcu+0x386/0x750 net/ipv4/ip_input.c:205
                    ip_local_deliver_finish+0x304/0x580 net/ipv4/ip_input.c:233
                    NF_HOOK+0x39d/0x450 include/linux/netfilter.h:302
                    NF_HOOK+0x39d/0x450 include/linux/netfilter.h:302
                    __netif_receive_skb_one_core net/core/dev.c:5569 [inline]
                    __netif_receive_skb+0x1c6/0x530 net/core/dev.c:5683
                    process_backlog+0x381/0x760 net/core/dev.c:6011
                    __napi_poll+0xc7/0x470 net/core/dev.c:6578
                    napi_poll net/core/dev.c:6645 [inline]
                    net_rx_action+0x70f/0xeb0 net/core/dev.c:6759
                    handle_softirqs+0x2ee/0xa40 kernel/softirq.c:578
                    run_ksoftirqd+0xc6/0x120 kernel/softirq.c:945
                    smpboot_thread_fn+0x52c/0xa30 kernel/smpboot.c:164
                    kthread+0x28d/0x320 kernel/kthread.c:376
                    ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
   INITIAL USE at:
                   lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
                   _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:326
                   __f_setown+0x38/0x350 fs/fcntl.c:91
                   f_setown_ex fs/fcntl.c:194 [inline]
                   do_fcntl+0x1137/0x1500 fs/fcntl.c:375
                   __do_sys_fcntl fs/fcntl.c:446 [inline]
                   __se_sys_fcntl+0xd5/0x1b0 fs/fcntl.c:431
                   do_syscall_x64 arch/x86/entry/common.c:51 [inline]
                   do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
                   entry_SYSCALL_64_after_hwframe+0x68/0xd2
   INITIAL READ USE at:
                        lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
                        __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
                        _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236
                        send_sigurg+0x25/0x3b0 fs/fcntl.c:809
                        sk_send_sigurg+0x6a/0xb0 net/core/sock.c:3366
                        tcp_check_urg+0x207/0x740 net/ipv4/tcp_input.c:5700
                        tcp_urg+0x154/0x440 net/ipv4/tcp_input.c:5741
                        tcp_rcv_established+0xe61/0x1e90 net/ipv4/tcp_input.c:6094
                        tcp_v4_do_rcv+0x487/0xb10 net/ipv4/tcp_ipv4.c:1683
                        sk_backlog_rcv include/net/sock.h:1119 [inline]
                        __release_sock+0x198/0x4b0 net/core/sock.c:2939
                        release_sock+0x5d/0x1c0 net/core/sock.c:3503
                        tcp_sendmsg+0x36/0x40 net/ipv4/tcp.c:1491
                        sock_sendmsg_nosec net/socket.c:718 [inline]
                        __sock_sendmsg net/socket.c:730 [inline]
                        __sys_sendto+0x480/0x600 net/socket.c:2153
                        __do_sys_sendto net/socket.c:2165 [inline]
                        __se_sys_sendto net/socket.c:2161 [inline]
                        __x64_sys_sendto+0xda/0xf0 net/socket.c:2161
                        do_syscall_x64 arch/x86/entry/common.c:51 [inline]
                        do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
                        entry_SYSCALL_64_after_hwframe+0x68/0xd2
 }
 ... key      at: [<ffffffff9748cca0>] __alloc_file.__key+0x0/0x10
 ... acquired at:
   lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
   _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236
   send_sigio+0x2f/0x360 fs/fcntl.c:770
   kill_fasync_rcu fs/fcntl.c:995 [inline]
   kill_fasync+0x232/0x4d0 fs/fcntl.c:1009
   sock_wake_async+0x145/0x170 net/socket.c:-1
   sk_wake_async+0x186/0x280 include/net/sock.h:2592
   sock_def_readable+0x1a7/0x280 net/core/sock.c:3310
   queue_oob+0x84f/0xaf0 net/unix/af_unix.c:2130
   unix_stream_sendmsg+0xe10/0x1070 net/unix/af_unix.c:2228
   sock_sendmsg_nosec net/socket.c:718 [inline]
   __sock_sendmsg net/socket.c:730 [inline]
   ____sys_sendmsg+0x5d3/0x9a0 net/socket.c:2519
   ___sys_sendmsg net/socket.c:2573 [inline]
   __sys_sendmmsg+0x3ab/0x730 net/socket.c:2659
   __do_sys_sendmmsg net/socket.c:2688 [inline]
   __se_sys_sendmmsg net/socket.c:2685 [inline]
   __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2685
   do_syscall_x64 arch/x86/entry/common.c:51 [inline]
   do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
   entry_SYSCALL_64_after_hwframe+0x68/0xd2


the dependencies between the lock to be acquired
 and SOFTIRQ-irq-unsafe lock:
-> (tasklist_lock){.+.+}-{2:2} {
   HARDIRQ-ON-R at:
                    lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
                    __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
                    _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
                    do_wait+0x2c6/0xb80 kernel/exit.c:1604
                    kernel_wait+0xe5/0x230 kernel/exit.c:1794
                    call_usermodehelper_exec_sync kernel/umh.c:140 [inline]
                    call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:167
                    process_one_work+0x917/0x1260 kernel/workqueue.c:2292
                    worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
                    kthread+0x28d/0x320 kernel/kthread.c:376
                    ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
   SOFTIRQ-ON-R at:
                    lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
                    __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
                    _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
                    do_wait+0x2c6/0xb80 kernel/exit.c:1604
                    kernel_wait+0xe5/0x230 kernel/exit.c:1794
                    call_usermodehelper_exec_sync kernel/umh.c:140 [inline]
                    call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:167
                    process_one_work+0x917/0x1260 kernel/workqueue.c:2292
                    worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
                    kthread+0x28d/0x320 kernel/kthread.c:376
                    ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
   INITIAL USE at:
                   lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
                   _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:326
                   copy_process+0x24f6/0x40a0 kernel/fork.c:2400
                   kernel_clone+0x222/0x920 kernel/fork.c:2681
                   user_mode_thread+0x140/0x1b0 kernel/fork.c:2757
                   rest_init+0x23/0x300 init/main.c:698
                   start_kernel+0x0/0x53f init/main.c:893
                   start_kernel+0x496/0x53f init/main.c:1140
                   secondary_startup_64_no_verify+0xcf/0xdb
   INITIAL READ USE at:
                        lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
                        __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
                        _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
                        do_wait+0x2c6/0xb80 kernel/exit.c:1604
                        kernel_wait+0xe5/0x230 kernel/exit.c:1794
                        call_usermodehelper_exec_sync kernel/umh.c:140 [inline]
                        call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:167
                        process_one_work+0x917/0x1260 kernel/workqueue.c:2292
                        worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
                        kthread+0x28d/0x320 kernel/kthread.c:376
                        ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 }
 ... key      at: [<ffffffff8d00a058>] tasklist_lock+0x18/0x40
 ... acquired at:
   lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
   __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
   _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
   send_sigio+0xf8/0x360 fs/fcntl.c:784
   kill_fasync_rcu fs/fcntl.c:995 [inline]
   kill_fasync+0x232/0x4d0 fs/fcntl.c:1009
   sock_wake_async+0x145/0x170 net/socket.c:-1
   sk_wake_async+0x186/0x280 include/net/sock.h:2592
   sock_def_readable+0x1a7/0x280 net/core/sock.c:3310
   unix_stream_sendmsg+0x8fd/0x1070 net/unix/af_unix.c:2222
   sock_sendmsg_nosec net/socket.c:718 [inline]
   __sock_sendmsg net/socket.c:730 [inline]
   ____sys_sendmsg+0x5d3/0x9a0 net/socket.c:2519
   ___sys_sendmsg net/socket.c:2573 [inline]
   __sys_sendmmsg+0x3ab/0x730 net/socket.c:2659
   __do_sys_sendmmsg net/socket.c:2688 [inline]
   __se_sys_sendmmsg net/socket.c:2685 [inline]
   __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2685
   do_syscall_x64 arch/x86/entry/common.c:51 [inline]
   do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
   entry_SYSCALL_64_after_hwframe+0x68/0xd2


stack backtrace:
CPU: 1 PID: 17144 Comm: syz.1.4609 Not tainted 6.1.134-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_bad_irq_dependency kernel/locking/lockdep.c:2604 [inline]
 check_irq_usage kernel/locking/lockdep.c:2843 [inline]
 check_prev_add kernel/locking/lockdep.c:3094 [inline]
 check_prevs_add kernel/locking/lockdep.c:3209 [inline]
 validate_chain+0x4d16/0x5950 kernel/locking/lockdep.c:3825
 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
 _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
 send_sigio+0xf8/0x360 fs/fcntl.c:784
 kill_fasync_rcu fs/fcntl.c:995 [inline]
 kill_fasync+0x232/0x4d0 fs/fcntl.c:1009
 sock_wake_async+0x145/0x170 net/socket.c:-1
 sk_wake_async+0x186/0x280 include/net/sock.h:2592
 sock_def_readable+0x1a7/0x280 net/core/sock.c:3310
 unix_stream_sendmsg+0x8fd/0x1070 net/unix/af_unix.c:2222
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5d3/0x9a0 net/socket.c:2519
 ___sys_sendmsg net/socket.c:2573 [inline]
 __sys_sendmmsg+0x3ab/0x730 net/socket.c:2659
 __do_sys_sendmmsg net/socket.c:2688 [inline]
 __se_sys_sendmmsg net/socket.c:2685 [inline]
 __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2685
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd40018e169
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:00007fd401031038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fd4003b5fa0 RCX: 00007fd40018e169
RDX: 0000000000000001 RSI: 0000200000006c40 RDI: 0000000000000003
RBP: 00007fd400210a68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000040814 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd4003b5fa0 R15: 00007ffe707f4ac8
 </TASK>

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/04/15 14:47 linux-6.1.y 420102835862 23b969b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in evdev_pass_values
2025/04/15 14:37 linux-6.1.y 420102835862 23b969b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in evdev_pass_values
2025/04/03 09:00 linux-6.1.y 8e60a714ba3b 996a9618 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in evdev_pass_values
2025/04/03 08:59 linux-6.1.y 8e60a714ba3b 996a9618 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in evdev_pass_values
* Struck through repros no longer work on HEAD.