=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
syzkaller #0 Not tainted
-----------------------------------------------------
syz.4.7454/30760 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffff8880757187f8 (&new->fa_lock){....}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:990 [inline]
ffff8880757187f8 (&new->fa_lock){....}-{2:2}, at: kill_fasync+0x192/0x4b0 fs/fcntl.c:1011
and this task is already holding:
ffff88805791d028 (&client->buffer_lock){..-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
ffff88805791d028 (&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/0x420 kernel/locking/lockdep.c:5754
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261
evdev_events+0x1d8/0x330 drivers/input/evdev.c:306
input_to_handler drivers/input/input.c:129 [inline]
input_pass_values+0x905/0x12f0 drivers/input/input.c:161
input_event_dispose+0x3e8/0x6c0 drivers/input/input.c:389
input_inject_event+0x1f9/0x320 drivers/input/input.c:465
kd_sound_helper+0x19f/0x210 drivers/tty/vt/keyboard.c:261
input_handler_for_each_handle+0xfb/0x1c0 drivers/input/input.c:2597
call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x542/0x800 kernel/time/timer.c:2023
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
preempt_schedule_irq+0xba/0x150 kernel/sched/core.c:7010
irqentry_exit+0x67/0x70 kernel/entry/common.c:438
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:692
lockdep_unregister_key+0x50b/0x5b0 kernel/locking/lockdep.c:6490
wq_unregister_lockdep kernel/workqueue.c:3969 [inline]
pwq_release_workfn+0x23c/0x2a0 kernel/workqueue.c:4201
kthread_worker_fn+0x4d4/0xa80 kernel/kthread.c:843
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
to a SOFTIRQ-irq-unsafe lock:
(tasklist_lock){.+.+}-{2:2}
... which became SOFTIRQ-irq-unsafe at:
...
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
do_wait+0x294/0xae0 kernel/exit.c:1607
kernel_wait+0xd7/0x1c0 kernel/exit.c:1797
call_usermodehelper_exec_sync kernel/umh.c:137 [inline]
call_usermodehelper_exec_work+0xb9/0x220 kernel/umh.c:164
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
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.4.7454/30760:
#0: ffff8881457c6110 (&evdev->mutex){+.+.}-{3:3}, at: evdev_write+0x180/0x490 drivers/input/evdev.c:513
#1: ffff888142eb8230 (&dev->event_lock#2){-.-.}-{2:2}, at: input_inject_event+0xab/0x320 drivers/input/input.c:460
#2: ffffffff8d132060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#2: ffffffff8d132060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#2: ffffffff8d132060 (rcu_read_lock){....}-{1:2}, at: input_inject_event+0xbc/0x320 drivers/input/input.c:462
#3: ffffffff8d132060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#3: ffffffff8d132060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#3: ffffffff8d132060 (rcu_read_lock){....}-{1:2}, at: input_pass_values+0xa3/0x12f0 drivers/input/input.c:153
#4: ffffffff8d132060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#4: ffffffff8d132060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#4: ffffffff8d132060 (rcu_read_lock){....}-{1:2}, at: evdev_events+0x79/0x330 drivers/input/evdev.c:298
#5: ffff88805791d028 (&client->buffer_lock){..-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
#5: ffff88805791d028 (&client->buffer_lock){..-.}-{2:2}, at: evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261
#6: ffffffff8d132060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#6: ffffffff8d132060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#6: ffffffff8d132060 (rcu_read_lock){....}-{1:2}, at: kill_fasync+0x53/0x4b0 fs/fcntl.c:1010
the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
-> (&client->buffer_lock){..-.}-{2:2} {
IN-SOFTIRQ-W at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261
evdev_events+0x1d8/0x330 drivers/input/evdev.c:306
input_to_handler drivers/input/input.c:129 [inline]
input_pass_values+0x905/0x12f0 drivers/input/input.c:161
input_event_dispose+0x3e8/0x6c0 drivers/input/input.c:389
input_inject_event+0x1f9/0x320 drivers/input/input.c:465
kd_sound_helper+0x19f/0x210 drivers/tty/vt/keyboard.c:261
input_handler_for_each_handle+0xfb/0x1c0 drivers/input/input.c:2597
call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x542/0x800 kernel/time/timer.c:2023
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
preempt_schedule_irq+0xba/0x150 kernel/sched/core.c:7010
irqentry_exit+0x67/0x70 kernel/entry/common.c:438
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:692
lockdep_unregister_key+0x50b/0x5b0 kernel/locking/lockdep.c:6490
wq_unregister_lockdep kernel/workqueue.c:3969 [inline]
pwq_release_workfn+0x23c/0x2a0 kernel/workqueue.c:4201
kthread_worker_fn+0x4d4/0xa80 kernel/kthread.c:843
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
INITIAL USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0xaf/0xf0 kernel/locking/spinlock.c:170
spin_lock_irq include/linux/spinlock.h:376 [inline]
evdev_fetch_next_event drivers/input/evdev.c:545 [inline]
evdev_read+0x377/0xba0 drivers/input/evdev.c:586
do_loop_readv_writev fs/read_write.c:-1 [inline]
do_iter_read+0x4fa/0xc90 fs/read_write.c:797
vfs_readv fs/read_write.c:915 [inline]
do_readv+0x264/0x460 fs/read_write.c:952
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
}
... key at: [<ffffffff9762cd20>] evdev_open.__key.28+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/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
do_wait+0x294/0xae0 kernel/exit.c:1607
kernel_wait+0xd7/0x1c0 kernel/exit.c:1797
call_usermodehelper_exec_sync kernel/umh.c:137 [inline]
call_usermodehelper_exec_work+0xb9/0x220 kernel/umh.c:164
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
SOFTIRQ-ON-R at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
do_wait+0x294/0xae0 kernel/exit.c:1607
kernel_wait+0xd7/0x1c0 kernel/exit.c:1797
call_usermodehelper_exec_sync kernel/umh.c:137 [inline]
call_usermodehelper_exec_work+0xb9/0x220 kernel/umh.c:164
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
INITIAL USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
_raw_write_lock_irq+0xaf/0xf0 kernel/locking/spinlock.c:326
copy_process+0x2275/0x3d80 kernel/fork.c:2631
kernel_clone+0x24b/0x8a0 kernel/fork.c:2914
user_mode_thread+0x111/0x180 kernel/fork.c:2992
rest_init+0x27/0x300 init/main.c:709
arch_call_rest_init+0xe/0x10 init/main.c:841
start_kernel+0x459/0x4e0 init/main.c:1086
x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:555
copy_bootdata+0x0/0xe0 arch/x86/kernel/head64.c:536
secondary_startup_64_no_verify+0x179/0x17b
INITIAL READ USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
do_wait+0x294/0xae0 kernel/exit.c:1607
kernel_wait+0xd7/0x1c0 kernel/exit.c:1797
call_usermodehelper_exec_sync kernel/umh.c:137 [inline]
call_usermodehelper_exec_work+0xb9/0x220 kernel/umh.c:164
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
}
... key at: [<ffffffff8ce0a058>] tasklist_lock+0x18/0x40
... acquired at:
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
send_sigurg+0xf0/0x3c0 fs/fcntl.c:827
sk_send_sigurg+0x6f/0xc0 net/core/sock.c:3412
queue_oob+0x3f1/0x4f0 net/unix/af_unix.c:2207
unix_stream_sendmsg+0xaf0/0xbf0 net/unix/af_unix.c:2326
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5ba/0x960 net/socket.c:2594
___sys_sendmsg+0x2a6/0x360 net/socket.c:2648
__sys_sendmmsg+0x2ca/0x510 net/socket.c:2734
__do_sys_sendmmsg net/socket.c:2763 [inline]
__se_sys_sendmmsg net/socket.c:2760 [inline]
__x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2760
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> (&f->f_owner.lock){...-}-{2:2} {
IN-SOFTIRQ-R at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0xbc/0x100 kernel/locking/spinlock.c:236
send_sigurg+0x29/0x3c0 fs/fcntl.c:811
sk_send_sigurg+0x6f/0xc0 net/core/sock.c:3412
tcp_check_urg+0x200/0x750 net/ipv4/tcp_input.c:5780
tcp_urg+0x164/0x410 net/ipv4/tcp_input.c:5821
tcp_rcv_established+0xa34/0x1d20 net/ipv4/tcp_input.c:6176
tcp_v4_do_rcv+0x4ed/0xb80 net/ipv4/tcp_ipv4.c:1734
tcp_v4_rcv+0x23bf/0x2af0 net/ipv4/tcp_ipv4.c:2166
ip_protocol_deliver_rcu+0x20e/0x3f0 net/ipv4/ip_input.c:205
ip_local_deliver_finish+0x2ca/0x510 net/ipv4/ip_input.c:233
NF_HOOK+0x32d/0x3b0 include/linux/netfilter.h:304
NF_HOOK+0x32d/0x3b0 include/linux/netfilter.h:304
__netif_receive_skb_one_core net/core/dev.c:5634 [inline]
__netif_receive_skb+0xcc/0x290 net/core/dev.c:5748
process_backlog+0x391/0x6f0 net/core/dev.c:6076
__napi_poll+0xc0/0x460 net/core/dev.c:6638
napi_poll net/core/dev.c:6705 [inline]
net_rx_action+0x616/0xc40 net/core/dev.c:6841
handle_softirqs+0x280/0x820 kernel/softirq.c:578
do_softirq+0xfa/0x1a0 kernel/softirq.c:479
__local_bh_enable_ip+0x184/0x1c0 kernel/softirq.c:406
sk_stream_wait_memory+0x6e3/0xee0 net/core/stream.c:145
tcp_sendmsg_locked+0x15cd/0x4bd0 net/ipv4/tcp.c:1305
tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1347
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
__sys_sendto+0x4a9/0x6b0 net/socket.c:2200
__do_sys_sendto net/socket.c:2212 [inline]
__se_sys_sendto net/socket.c:2208 [inline]
__x64_sys_sendto+0xde/0xf0 net/socket.c:2208
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
INITIAL USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
_raw_write_lock_irq+0xaf/0xf0 kernel/locking/spinlock.c:326
__f_setown+0x3b/0x330 fs/fcntl.c:92
generic_add_lease fs/locks.c:1815 [inline]
generic_setlease+0xe58/0x1290 fs/locks.c:1895
vfs_setlease fs/locks.c:1960 [inline]
do_fcntl_add_lease fs/locks.c:1981 [inline]
fcntl_setlease+0x26c/0x340 fs/locks.c:2003
do_fcntl+0x1db/0x1490 fs/fcntl.c:397
__do_sys_fcntl fs/fcntl.c:448 [inline]
__se_sys_fcntl+0xc9/0x1a0 fs/fcntl.c:433
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
INITIAL READ USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0xbc/0x100 kernel/locking/spinlock.c:236
send_sigurg+0x29/0x3c0 fs/fcntl.c:811
sk_send_sigurg+0x6f/0xc0 net/core/sock.c:3412
queue_oob+0x3f1/0x4f0 net/unix/af_unix.c:2207
unix_stream_sendmsg+0xaf0/0xbf0 net/unix/af_unix.c:2326
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5ba/0x960 net/socket.c:2594
___sys_sendmsg+0x2a6/0x360 net/socket.c:2648
__sys_sendmsg net/socket.c:2677 [inline]
__do_sys_sendmsg net/socket.c:2686 [inline]
__se_sys_sendmsg+0x1c2/0x2b0 net/socket.c:2684
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
}
... key at: [<ffffffff97332ea0>] init_file.__key+0x0/0x20
... acquired at:
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0xbc/0x100 kernel/locking/spinlock.c:236
send_sigio+0x33/0x360 fs/fcntl.c:772
kill_fasync_rcu fs/fcntl.c:997 [inline]
kill_fasync+0x228/0x4b0 fs/fcntl.c:1011
lease_break_callback+0x26/0x30 fs/locks.c:522
__break_lease+0x4a5/0x12b0 fs/locks.c:1537
break_lease include/linux/filelock.h:360 [inline]
do_dentry_open+0x823/0x1500 fs/open.c:920
do_open fs/namei.c:3640 [inline]
path_openat+0x27f1/0x3230 fs/namei.c:3797
do_filp_open+0x1f5/0x430 fs/namei.c:3824
do_sys_openat2+0x134/0x1d0 fs/open.c:1421
do_sys_open fs/open.c:1436 [inline]
__do_sys_openat fs/open.c:1452 [inline]
__se_sys_openat fs/open.c:1447 [inline]
__x64_sys_openat+0x139/0x160 fs/open.c:1447
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> (&new->fa_lock){....}-{2:2} {
INITIAL USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
_raw_write_lock_irq+0xaf/0xf0 kernel/locking/spinlock.c:326
fasync_remove_entry+0xf4/0x1c0 fs/fcntl.c:867
lease_modify+0x1a6/0x390 fs/locks.c:1402
locks_remove_lease fs/locks.c:2617 [inline]
locks_remove_file+0x548/0xee0 fs/locks.c:2642
__fput+0x18f/0x970 fs/file_table.c:376
task_work_run+0x1d4/0x260 kernel/task_work.c:245
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
INITIAL READ USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0xbc/0x100 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:990 [inline]
kill_fasync+0x192/0x4b0 fs/fcntl.c:1011
lease_break_callback+0x26/0x30 fs/locks.c:522
__break_lease+0x4a5/0x12b0 fs/locks.c:1537
break_lease include/linux/filelock.h:360 [inline]
do_dentry_open+0x823/0x1500 fs/open.c:920
do_open fs/namei.c:3640 [inline]
path_openat+0x27f1/0x3230 fs/namei.c:3797
do_filp_open+0x1f5/0x430 fs/namei.c:3824
do_sys_openat2+0x134/0x1d0 fs/open.c:1421
do_sys_open fs/open.c:1436 [inline]
__do_sys_openat fs/open.c:1452 [inline]
__se_sys_openat fs/open.c:1447 [inline]
__x64_sys_openat+0x139/0x160 fs/open.c:1447
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
}
... key at: [<ffffffff97333b20>] fasync_insert_entry.__key+0x0/0x20
... acquired at:
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0xbc/0x100 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:990 [inline]
kill_fasync+0x192/0x4b0 fs/fcntl.c:1011
__pass_event drivers/input/evdev.c:240 [inline]
evdev_pass_values+0x54b/0xab0 drivers/input/evdev.c:278
evdev_events+0x1d8/0x330 drivers/input/evdev.c:306
input_to_handler drivers/input/input.c:129 [inline]
input_pass_values+0x905/0x12f0 drivers/input/input.c:161
input_event_dispose+0x346/0x6c0 drivers/input/input.c:378
input_inject_event+0x1f9/0x320 drivers/input/input.c:465
evdev_write+0x35f/0x490 drivers/input/evdev.c:530
vfs_write+0x296/0x990 fs/read_write.c:582
ksys_write+0x150/0x260 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
stack backtrace:
CPU: 1 PID: 30760 Comm: syz.4.7454 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
<TASK>
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
print_bad_irq_dependency kernel/locking/lockdep.c:2626 [inline]
check_irq_usage kernel/locking/lockdep.c:2865 [inline]
check_prev_add kernel/locking/lockdep.c:3138 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x6851/0x7d40 kernel/locking/lockdep.c:5137
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0xbc/0x100 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:990 [inline]
kill_fasync+0x192/0x4b0 fs/fcntl.c:1011
__pass_event drivers/input/evdev.c:240 [inline]
evdev_pass_values+0x54b/0xab0 drivers/input/evdev.c:278
evdev_events+0x1d8/0x330 drivers/input/evdev.c:306
input_to_handler drivers/input/input.c:129 [inline]
input_pass_values+0x905/0x12f0 drivers/input/input.c:161
input_event_dispose+0x346/0x6c0 drivers/input/input.c:378
input_inject_event+0x1f9/0x320 drivers/input/input.c:465
evdev_write+0x35f/0x490 drivers/input/evdev.c:530
vfs_write+0x296/0x990 fs/read_write.c:582
ksys_write+0x150/0x260 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f361819c799
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:00007f3618f6e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f3618415fa0 RCX: 00007f361819c799
RDX: 0000000000000037 RSI: 0000200000000040 RDI: 0000000000000004
RBP: 00007f3618232c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3618416038 R14: 00007f3618415fa0 R15: 00007ffce4a1bd08
</TASK>