[syzbot] [input?] possible deadlock in input_repeat_key
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syzbot
Feb 23, 2026, 5:46:24 PM (18 hours ago) Feb 23
to amir...@gmail.com, ja...@suse.cz, linux-...@vger.kernel.org, linux...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: a95f71ad3e2e Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17db0152580000
kernel config: https://syzkaller.appspot.com/x/.config?x=665cbf0979cda6c5
dashboard link: https://syzkaller.appspot.com/bug?extid=422e601066bf071a9f8e
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3abe9dfc8715/disk-a95f71ad.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0a4dab480d10/vmlinux-a95f71ad.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d2eecb72d9bd/bzImage-a95f71ad.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+422e60...@syzkaller.appspotmail.com
=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
syzkaller #0 Tainted: G L
-----------------------------------------------------
syz.0.6889/23959 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffff88805533cf30 (&new->fa_lock){....}-{3:3}, at: kill_fasync_rcu fs/fcntl.c:1135 [inline]
ffff88805533cf30 (&new->fa_lock){....}-{3:3}, at: kill_fasync+0x199/0x4d0 fs/fcntl.c:1159
and this task is already holding:
ffff88802bb32230 (&dev->event_lock#2){..-.}-{3:3}, at: class_spinlock_irqsave_constructor include/linux/spinlock.h:618 [inline]
ffff88802bb32230 (&dev->event_lock#2){..-.}-{3:3}, at: input_inject_event+0xa5/0x340 drivers/input/input.c:419
which would create a new lock dependency:
(&dev->event_lock#2){..-.}-{3:3} -> (&new->fa_lock){....}-{3:3}
but this new dependency connects a SOFTIRQ-irq-safe lock:
(&dev->event_lock#2){..-.}-{3:3}
... which became SOFTIRQ-irq-safe at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162
class_spinlock_irqsave_constructor include/linux/spinlock.h:618 [inline]
input_repeat_key+0x33/0x680 drivers/input/input.c:2220
call_timer_fn+0x192/0x640 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1799 [inline]
__run_timers kernel/time/timer.c:2373 [inline]
__run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385
run_timer_base kernel/time/timer.c:2394 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404
handle_softirqs+0x22a/0x870 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
rcu_is_watching+0x70/0xb0 kernel/rcu/tree.c:754
rcu_read_lock_held_common kernel/rcu/update.c:109 [inline]
rcu_read_lock_held+0x15/0x50 kernel/rcu/update.c:349
mas_root lib/maple_tree.c:780 [inline]
mas_start+0x1e9/0x560 lib/maple_tree.c:1200
mas_state_walk lib/maple_tree.c:3291 [inline]
mas_walk+0x8b/0x2e0 lib/maple_tree.c:4599
lock_vma_under_rcu+0x1bd/0x500 mm/mmap_lock.c:304
do_user_addr_fault+0x2d8/0x1340 arch/x86/mm/fault.c:1325
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
to a SOFTIRQ-irq-unsafe lock:
(tasklist_lock){.+.+}-{3:3}
... which became SOFTIRQ-irq-unsafe at:
...
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
__do_wait+0xde/0x740 kernel/exit.c:1672
do_wait+0x1e7/0x540 kernel/exit.c:1716
kernel_wait+0xd6/0x1c0 kernel/exit.c:1892
call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
call_usermodehelper_exec_work+0xbe/0x230 kernel/umh.c:163
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
other info that might help us debug this:
Chain exists of:
&dev->event_lock#2 --> &new->fa_lock --> tasklist_lock
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(tasklist_lock);
local_irq_disable();
lock(&dev->event_lock#2);
lock(&new->fa_lock);
<Interrupt>
lock(&dev->event_lock#2);
*** DEADLOCK ***
6 locks held by syz.0.6889/23959:
#0: ffff88802bc7c118 (&evdev->mutex){+.+.}-{4:4}, at: evdev_write+0x1ae/0x4c0 drivers/input/evdev.c:511
#1: ffff88802bb32230 (&dev->event_lock#2){..-.}-{3:3}, at: class_spinlock_irqsave_constructor include/linux/spinlock.h:618 [inline]
#1: ffff88802bb32230 (&dev->event_lock#2){..-.}-{3:3}, at: input_inject_event+0xa5/0x340 drivers/input/input.c:419
#2: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#2: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#2: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
#2: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: input_inject_event+0xb6/0x340 drivers/input/input.c:420
#3: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#3: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#3: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
#3: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: input_pass_values+0x8d/0x890 drivers/input/input.c:119
#4: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#4: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#4: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: mousedev_notify_readers+0x2c/0xc00 drivers/input/mousedev.c:269
#5: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#5: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#5: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: kill_fasync+0x53/0x4d0 fs/fcntl.c:1158
the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
-> (&dev->event_lock#2){..-.}-{3:3} {
IN-SOFTIRQ-W at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162
class_spinlock_irqsave_constructor include/linux/spinlock.h:618 [inline]
input_repeat_key+0x33/0x680 drivers/input/input.c:2220
call_timer_fn+0x192/0x640 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1799 [inline]
__run_timers kernel/time/timer.c:2373 [inline]
__run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385
run_timer_base kernel/time/timer.c:2394 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404
handle_softirqs+0x22a/0x870 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
rcu_is_watching+0x70/0xb0 kernel/rcu/tree.c:754
rcu_read_lock_held_common kernel/rcu/update.c:109 [inline]
rcu_read_lock_held+0x15/0x50 kernel/rcu/update.c:349
mas_root lib/maple_tree.c:780 [inline]
mas_start+0x1e9/0x560 lib/maple_tree.c:1200
mas_state_walk lib/maple_tree.c:3291 [inline]
mas_walk+0x8b/0x2e0 lib/maple_tree.c:4599
lock_vma_under_rcu+0x1bd/0x500 mm/mmap_lock.c:304
do_user_addr_fault+0x2d8/0x1340 arch/x86/mm/fault.c:1325
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
INITIAL USE at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162
class_spinlock_irqsave_constructor include/linux/spinlock.h:618 [inline]
input_inject_event+0xa5/0x340 drivers/input/input.c:419
kbd_led_trigger_activate+0xbc/0x100 drivers/tty/vt/keyboard.c:1021
led_trigger_set+0x535/0x960 drivers/leds/led-triggers.c:220
led_match_default_trigger drivers/leds/led-triggers.c:277 [inline]
led_trigger_set_default+0x260/0x2a0 drivers/leds/led-triggers.c:300
led_classdev_register_ext+0x787/0x9c0 drivers/leds/led-class.c:578
led_classdev_register include/linux/leds.h:274 [inline]
input_leds_connect+0x517/0x790 drivers/input/input-leds.c:145
input_attach_handler drivers/input/input.c:994 [inline]
input_register_device+0xd00/0x1160 drivers/input/input.c:2378
atkbd_connect+0x731/0xa50 drivers/input/keyboard/atkbd.c:1340
serio_connect_driver drivers/input/serio/serio.c:44 [inline]
serio_driver_probe+0x82/0xd0 drivers/input/serio/serio.c:748
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x267/0xaf0 drivers/base/dd.c:661
__driver_probe_device+0x18c/0x320 drivers/base/dd.c:803
driver_probe_device+0x4f/0x240 drivers/base/dd.c:833
__driver_attach+0x3e7/0x710 drivers/base/dd.c:1227
bus_for_each_dev+0x23b/0x2c0 drivers/base/bus.c:383
serio_attach_driver drivers/input/serio/serio.c:777 [inline]
serio_handle_event+0x20a/0xdd0 drivers/input/serio/serio.c:214
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
}
... key at: [<ffffffff9a6053c0>] input_allocate_device.__key.7+0x0/0x20
the dependencies between the lock to be acquired
and SOFTIRQ-irq-unsafe lock:
-> (tasklist_lock){.+.+}-{3:3} {
HARDIRQ-ON-R at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
__do_wait+0xde/0x740 kernel/exit.c:1672
do_wait+0x1e7/0x540 kernel/exit.c:1716
kernel_wait+0xd6/0x1c0 kernel/exit.c:1892
call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
call_usermodehelper_exec_work+0xbe/0x230 kernel/umh.c:163
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
SOFTIRQ-ON-R at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
__do_wait+0xde/0x740 kernel/exit.c:1672
do_wait+0x1e7/0x540 kernel/exit.c:1716
kernel_wait+0xd6/0x1c0 kernel/exit.c:1892
call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
call_usermodehelper_exec_work+0xbe/0x230 kernel/umh.c:163
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INITIAL USE at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_write_lock_irq include/linux/rwlock_api_smp.h:211 [inline]
_raw_write_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:326
copy_process+0x247a/0x3cf0 kernel/fork.c:2369
kernel_clone+0x248/0x8e0 kernel/fork.c:2654
user_mode_thread+0x110/0x180 kernel/fork.c:2730
rest_init+0x23/0x300 init/main.c:725
start_kernel+0x385/0x3d0 init/main.c:1210
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x147
INITIAL READ USE at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
__do_wait+0xde/0x740 kernel/exit.c:1672
do_wait+0x1e7/0x540 kernel/exit.c:1716
kernel_wait+0xd6/0x1c0 kernel/exit.c:1892
call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
call_usermodehelper_exec_work+0xbe/0x230 kernel/umh.c:163
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
}
... key at: [<ffffffff8e40c058>] tasklist_lock+0x18/0x40
... acquired at:
__raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
send_sigio+0x101/0x370 fs/fcntl.c:932
kill_fasync_rcu fs/fcntl.c:1144 [inline]
kill_fasync+0x24d/0x4d0 fs/fcntl.c:1159
sock_wake_async+0x137/0x160 net/socket.c:-1
sk_wake_async_rcu include/net/sock.h:2579 [inline]
sock_def_readable+0x3c1/0x580 net/core/sock.c:3613
unix_stream_sendmsg+0x8a3/0xe80 net/unix/af_unix.c:2480
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
____sys_sendmsg+0xa68/0xad0 net/socket.c:2592
___sys_sendmsg+0x2a5/0x360 net/socket.c:2646
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2683 [inline]
__se_sys_sendmsg net/socket.c:2681 [inline]
__x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> (&f_owner->lock){....}-{3:3} {
INITIAL USE at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_write_lock_irq include/linux/rwlock_api_smp.h:211 [inline]
_raw_write_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:326
__f_setown+0x67/0x370 fs/fcntl.c:136
fcntl_dirnotify+0x3f9/0x6a0 fs/notify/dnotify/dnotify.c:369
do_fcntl+0x77e/0x1a20 fs/fcntl.c:538
__do_sys_fcntl fs/fcntl.c:602 [inline]
__se_sys_fcntl+0xc8/0x150 fs/fcntl.c:587
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
INITIAL READ USE at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:172 [inline]
_raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:236
send_sigio+0x38/0x370 fs/fcntl.c:918
kill_fasync_rcu fs/fcntl.c:1144 [inline]
kill_fasync+0x24d/0x4d0 fs/fcntl.c:1159
sock_wake_async+0x137/0x160 net/socket.c:-1
sk_wake_async_rcu include/net/sock.h:2579 [inline]
sock_def_readable+0x3c1/0x580 net/core/sock.c:3613
unix_stream_sendmsg+0x8a3/0xe80 net/unix/af_unix.c:2480
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
____sys_sendmsg+0xa68/0xad0 net/socket.c:2592
___sys_sendmsg+0x2a5/0x360 net/socket.c:2646
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2683 [inline]
__se_sys_sendmsg net/socket.c:2681 [inline]
__x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
}
... key at: [<ffffffff9a2e6160>] file_f_owner_allocate.__key+0x0/0x20
... acquired at:
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:172 [inline]
_raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:236
send_sigio+0x38/0x370 fs/fcntl.c:918
kill_fasync_rcu fs/fcntl.c:1144 [inline]
kill_fasync+0x24d/0x4d0 fs/fcntl.c:1159
sock_wake_async+0x137/0x160 net/socket.c:-1
sk_wake_async_rcu include/net/sock.h:2579 [inline]
sock_def_readable+0x3c1/0x580 net/core/sock.c:3613
unix_stream_sendmsg+0x8a3/0xe80 net/unix/af_unix.c:2480
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
____sys_sendmsg+0xa68/0xad0 net/socket.c:2592
___sys_sendmsg+0x2a5/0x360 net/socket.c:2646
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2683 [inline]
__se_sys_sendmsg net/socket.c:2681 [inline]
__x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> (&new->fa_lock){....}-{3:3} {
INITIAL USE at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_write_lock_irq include/linux/rwlock_api_smp.h:211 [inline]
_raw_write_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:326
fasync_remove_entry+0xf1/0x1c0 fs/fcntl.c:1012
sock_fasync+0x85/0xf0 net/socket.c:1480
__fput+0x8a5/0xa70 fs/file_table.c:466
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
INITIAL READ USE at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:172 [inline]
_raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:1135 [inline]
kill_fasync+0x199/0x4d0 fs/fcntl.c:1159
sock_wake_async+0x137/0x160 net/socket.c:-1
sk_wake_async_rcu include/net/sock.h:2579 [inline]
sock_def_readable+0x3c1/0x580 net/core/sock.c:3613
unix_stream_sendmsg+0x8a3/0xe80 net/unix/af_unix.c:2480
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
____sys_sendmsg+0xa68/0xad0 net/socket.c:2592
___sys_sendmsg+0x2a5/0x360 net/socket.c:2646
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2683 [inline]
__se_sys_sendmsg net/socket.c:2681 [inline]
__x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
}
... key at: [<ffffffff9a2e6180>] fasync_insert_entry.__key+0x0/0x20
... acquired at:
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:172 [inline]
_raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:1135 [inline]
kill_fasync+0x199/0x4d0 fs/fcntl.c:1159
mousedev_notify_readers+0x6f1/0xc00 drivers/input/mousedev.c:309
mousedev_event+0x602/0x1320 drivers/input/mousedev.c:394
input_handle_events_default+0xd4/0x1a0 drivers/input/input.c:2541
input_pass_values+0x288/0x890 drivers/input/input.c:128
input_event_dispose+0x330/0x6b0 drivers/input/input.c:342
input_inject_event+0x1dd/0x340 drivers/input/input.c:424
evdev_write+0x325/0x4c0 drivers/input/evdev.c:528
vfs_write+0x29a/0xb90 fs/read_write.c:686
ksys_write+0x150/0x270 fs/read_write.c:740
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
stack backtrace:
CPU: 1 UID: 0 PID: 23959 Comm: syz.0.6889 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_bad_irq_dependency kernel/locking/lockdep.c:2616 [inline]
check_irq_usage kernel/locking/lockdep.c:2857 [inline]
check_prev_add kernel/locking/lockdep.c:3169 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x2a94/0x2cf0 kernel/locking/lockdep.c:5237
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:172 [inline]
_raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:1135 [inline]
kill_fasync+0x199/0x4d0 fs/fcntl.c:1159
mousedev_notify_readers+0x6f1/0xc00 drivers/input/mousedev.c:309
mousedev_event+0x602/0x1320 drivers/input/mousedev.c:394
input_handle_events_default+0xd4/0x1a0 drivers/input/input.c:2541
input_pass_values+0x288/0x890 drivers/input/input.c:128
input_event_dispose+0x330/0x6b0 drivers/input/input.c:342
input_inject_event+0x1dd/0x340 drivers/input/input.c:424
evdev_write+0x325/0x4c0 drivers/input/evdev.c:528
vfs_write+0x29a/0xb90 fs/read_write.c:686
ksys_write+0x150/0x270 fs/read_write.c:740
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1f91b9c629
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:00007f1f92b1f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f1f91e15fa0 RCX: 00007f1f91b9c629
RDX: 0000000000000918 RSI: 0000200000000040 RDI: 0000000000000004
RBP: 00007f1f91c32b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1f91e16038 R14: 00007f1f91e15fa0 R15: 00007f1f91f3fa48
</TASK>
---
This report is generated by a bot. It may contain errors.
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#syz undup
syzbot found the following issue on:
HEAD commit: a95f71ad3e2e Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17db0152580000
kernel config: https://syzkaller.appspot.com/x/.config?x=665cbf0979cda6c5
dashboard link: https://syzkaller.appspot.com/bug?extid=422e601066bf071a9f8e
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3abe9dfc8715/disk-a95f71ad.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0a4dab480d10/vmlinux-a95f71ad.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d2eecb72d9bd/bzImage-a95f71ad.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+422e60...@syzkaller.appspotmail.com
=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
syzkaller #0 Tainted: G L
-----------------------------------------------------
syz.0.6889/23959 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffff88805533cf30 (&new->fa_lock){....}-{3:3}, at: kill_fasync_rcu fs/fcntl.c:1135 [inline]
ffff88805533cf30 (&new->fa_lock){....}-{3:3}, at: kill_fasync+0x199/0x4d0 fs/fcntl.c:1159
and this task is already holding:
ffff88802bb32230 (&dev->event_lock#2){..-.}-{3:3}, at: class_spinlock_irqsave_constructor include/linux/spinlock.h:618 [inline]
ffff88802bb32230 (&dev->event_lock#2){..-.}-{3:3}, at: input_inject_event+0xa5/0x340 drivers/input/input.c:419
which would create a new lock dependency:
(&dev->event_lock#2){..-.}-{3:3} -> (&new->fa_lock){....}-{3:3}
but this new dependency connects a SOFTIRQ-irq-safe lock:
(&dev->event_lock#2){..-.}-{3:3}
... which became SOFTIRQ-irq-safe at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162
class_spinlock_irqsave_constructor include/linux/spinlock.h:618 [inline]
input_repeat_key+0x33/0x680 drivers/input/input.c:2220
call_timer_fn+0x192/0x640 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1799 [inline]
__run_timers kernel/time/timer.c:2373 [inline]
__run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385
run_timer_base kernel/time/timer.c:2394 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404
handle_softirqs+0x22a/0x870 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
rcu_is_watching+0x70/0xb0 kernel/rcu/tree.c:754
rcu_read_lock_held_common kernel/rcu/update.c:109 [inline]
rcu_read_lock_held+0x15/0x50 kernel/rcu/update.c:349
mas_root lib/maple_tree.c:780 [inline]
mas_start+0x1e9/0x560 lib/maple_tree.c:1200
mas_state_walk lib/maple_tree.c:3291 [inline]
mas_walk+0x8b/0x2e0 lib/maple_tree.c:4599
lock_vma_under_rcu+0x1bd/0x500 mm/mmap_lock.c:304
do_user_addr_fault+0x2d8/0x1340 arch/x86/mm/fault.c:1325
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
to a SOFTIRQ-irq-unsafe lock:
(tasklist_lock){.+.+}-{3:3}
... which became SOFTIRQ-irq-unsafe at:
...
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
__do_wait+0xde/0x740 kernel/exit.c:1672
do_wait+0x1e7/0x540 kernel/exit.c:1716
kernel_wait+0xd6/0x1c0 kernel/exit.c:1892
call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
call_usermodehelper_exec_work+0xbe/0x230 kernel/umh.c:163
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
other info that might help us debug this:
Chain exists of:
&dev->event_lock#2 --> &new->fa_lock --> tasklist_lock
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(tasklist_lock);
local_irq_disable();
lock(&dev->event_lock#2);
lock(&new->fa_lock);
<Interrupt>
lock(&dev->event_lock#2);
*** DEADLOCK ***
6 locks held by syz.0.6889/23959:
#0: ffff88802bc7c118 (&evdev->mutex){+.+.}-{4:4}, at: evdev_write+0x1ae/0x4c0 drivers/input/evdev.c:511
#1: ffff88802bb32230 (&dev->event_lock#2){..-.}-{3:3}, at: class_spinlock_irqsave_constructor include/linux/spinlock.h:618 [inline]
#1: ffff88802bb32230 (&dev->event_lock#2){..-.}-{3:3}, at: input_inject_event+0xa5/0x340 drivers/input/input.c:419
#2: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#2: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#2: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
#2: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: input_inject_event+0xb6/0x340 drivers/input/input.c:420
#3: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#3: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#3: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
#3: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: input_pass_values+0x8d/0x890 drivers/input/input.c:119
#4: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#4: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#4: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: mousedev_notify_readers+0x2c/0xc00 drivers/input/mousedev.c:269
#5: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#5: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#5: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: kill_fasync+0x53/0x4d0 fs/fcntl.c:1158
the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
-> (&dev->event_lock#2){..-.}-{3:3} {
IN-SOFTIRQ-W at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162
class_spinlock_irqsave_constructor include/linux/spinlock.h:618 [inline]
input_repeat_key+0x33/0x680 drivers/input/input.c:2220
call_timer_fn+0x192/0x640 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1799 [inline]
__run_timers kernel/time/timer.c:2373 [inline]
__run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385
run_timer_base kernel/time/timer.c:2394 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404
handle_softirqs+0x22a/0x870 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
rcu_is_watching+0x70/0xb0 kernel/rcu/tree.c:754
rcu_read_lock_held_common kernel/rcu/update.c:109 [inline]
rcu_read_lock_held+0x15/0x50 kernel/rcu/update.c:349
mas_root lib/maple_tree.c:780 [inline]
mas_start+0x1e9/0x560 lib/maple_tree.c:1200
mas_state_walk lib/maple_tree.c:3291 [inline]
mas_walk+0x8b/0x2e0 lib/maple_tree.c:4599
lock_vma_under_rcu+0x1bd/0x500 mm/mmap_lock.c:304
do_user_addr_fault+0x2d8/0x1340 arch/x86/mm/fault.c:1325
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
INITIAL USE at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162
class_spinlock_irqsave_constructor include/linux/spinlock.h:618 [inline]
input_inject_event+0xa5/0x340 drivers/input/input.c:419
kbd_led_trigger_activate+0xbc/0x100 drivers/tty/vt/keyboard.c:1021
led_trigger_set+0x535/0x960 drivers/leds/led-triggers.c:220
led_match_default_trigger drivers/leds/led-triggers.c:277 [inline]
led_trigger_set_default+0x260/0x2a0 drivers/leds/led-triggers.c:300
led_classdev_register_ext+0x787/0x9c0 drivers/leds/led-class.c:578
led_classdev_register include/linux/leds.h:274 [inline]
input_leds_connect+0x517/0x790 drivers/input/input-leds.c:145
input_attach_handler drivers/input/input.c:994 [inline]
input_register_device+0xd00/0x1160 drivers/input/input.c:2378
atkbd_connect+0x731/0xa50 drivers/input/keyboard/atkbd.c:1340
serio_connect_driver drivers/input/serio/serio.c:44 [inline]
serio_driver_probe+0x82/0xd0 drivers/input/serio/serio.c:748
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x267/0xaf0 drivers/base/dd.c:661
__driver_probe_device+0x18c/0x320 drivers/base/dd.c:803
driver_probe_device+0x4f/0x240 drivers/base/dd.c:833
__driver_attach+0x3e7/0x710 drivers/base/dd.c:1227
bus_for_each_dev+0x23b/0x2c0 drivers/base/bus.c:383
serio_attach_driver drivers/input/serio/serio.c:777 [inline]
serio_handle_event+0x20a/0xdd0 drivers/input/serio/serio.c:214
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
}
... key at: [<ffffffff9a6053c0>] input_allocate_device.__key.7+0x0/0x20
the dependencies between the lock to be acquired
and SOFTIRQ-irq-unsafe lock:
-> (tasklist_lock){.+.+}-{3:3} {
HARDIRQ-ON-R at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
__do_wait+0xde/0x740 kernel/exit.c:1672
do_wait+0x1e7/0x540 kernel/exit.c:1716
kernel_wait+0xd6/0x1c0 kernel/exit.c:1892
call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
call_usermodehelper_exec_work+0xbe/0x230 kernel/umh.c:163
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
SOFTIRQ-ON-R at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
__do_wait+0xde/0x740 kernel/exit.c:1672
do_wait+0x1e7/0x540 kernel/exit.c:1716
kernel_wait+0xd6/0x1c0 kernel/exit.c:1892
call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
call_usermodehelper_exec_work+0xbe/0x230 kernel/umh.c:163
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INITIAL USE at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_write_lock_irq include/linux/rwlock_api_smp.h:211 [inline]
_raw_write_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:326
copy_process+0x247a/0x3cf0 kernel/fork.c:2369
kernel_clone+0x248/0x8e0 kernel/fork.c:2654
user_mode_thread+0x110/0x180 kernel/fork.c:2730
rest_init+0x23/0x300 init/main.c:725
start_kernel+0x385/0x3d0 init/main.c:1210
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x147
INITIAL READ USE at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
__do_wait+0xde/0x740 kernel/exit.c:1672
do_wait+0x1e7/0x540 kernel/exit.c:1716
kernel_wait+0xd6/0x1c0 kernel/exit.c:1892
call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
call_usermodehelper_exec_work+0xbe/0x230 kernel/umh.c:163
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
}
... key at: [<ffffffff8e40c058>] tasklist_lock+0x18/0x40
... acquired at:
__raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
send_sigio+0x101/0x370 fs/fcntl.c:932
kill_fasync_rcu fs/fcntl.c:1144 [inline]
kill_fasync+0x24d/0x4d0 fs/fcntl.c:1159
sock_wake_async+0x137/0x160 net/socket.c:-1
sk_wake_async_rcu include/net/sock.h:2579 [inline]
sock_def_readable+0x3c1/0x580 net/core/sock.c:3613
unix_stream_sendmsg+0x8a3/0xe80 net/unix/af_unix.c:2480
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
____sys_sendmsg+0xa68/0xad0 net/socket.c:2592
___sys_sendmsg+0x2a5/0x360 net/socket.c:2646
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2683 [inline]
__se_sys_sendmsg net/socket.c:2681 [inline]
__x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> (&f_owner->lock){....}-{3:3} {
INITIAL USE at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_write_lock_irq include/linux/rwlock_api_smp.h:211 [inline]
_raw_write_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:326
__f_setown+0x67/0x370 fs/fcntl.c:136
fcntl_dirnotify+0x3f9/0x6a0 fs/notify/dnotify/dnotify.c:369
do_fcntl+0x77e/0x1a20 fs/fcntl.c:538
__do_sys_fcntl fs/fcntl.c:602 [inline]
__se_sys_fcntl+0xc8/0x150 fs/fcntl.c:587
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
INITIAL READ USE at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:172 [inline]
_raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:236
send_sigio+0x38/0x370 fs/fcntl.c:918
kill_fasync_rcu fs/fcntl.c:1144 [inline]
kill_fasync+0x24d/0x4d0 fs/fcntl.c:1159
sock_wake_async+0x137/0x160 net/socket.c:-1
sk_wake_async_rcu include/net/sock.h:2579 [inline]
sock_def_readable+0x3c1/0x580 net/core/sock.c:3613
unix_stream_sendmsg+0x8a3/0xe80 net/unix/af_unix.c:2480
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
____sys_sendmsg+0xa68/0xad0 net/socket.c:2592
___sys_sendmsg+0x2a5/0x360 net/socket.c:2646
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2683 [inline]
__se_sys_sendmsg net/socket.c:2681 [inline]
__x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
}
... key at: [<ffffffff9a2e6160>] file_f_owner_allocate.__key+0x0/0x20
... acquired at:
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:172 [inline]
_raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:236
send_sigio+0x38/0x370 fs/fcntl.c:918
kill_fasync_rcu fs/fcntl.c:1144 [inline]
kill_fasync+0x24d/0x4d0 fs/fcntl.c:1159
sock_wake_async+0x137/0x160 net/socket.c:-1
sk_wake_async_rcu include/net/sock.h:2579 [inline]
sock_def_readable+0x3c1/0x580 net/core/sock.c:3613
unix_stream_sendmsg+0x8a3/0xe80 net/unix/af_unix.c:2480
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
____sys_sendmsg+0xa68/0xad0 net/socket.c:2592
___sys_sendmsg+0x2a5/0x360 net/socket.c:2646
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2683 [inline]
__se_sys_sendmsg net/socket.c:2681 [inline]
__x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> (&new->fa_lock){....}-{3:3} {
INITIAL USE at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_write_lock_irq include/linux/rwlock_api_smp.h:211 [inline]
_raw_write_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:326
fasync_remove_entry+0xf1/0x1c0 fs/fcntl.c:1012
sock_fasync+0x85/0xf0 net/socket.c:1480
__fput+0x8a5/0xa70 fs/file_table.c:466
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
INITIAL READ USE at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:172 [inline]
_raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:1135 [inline]
kill_fasync+0x199/0x4d0 fs/fcntl.c:1159
sock_wake_async+0x137/0x160 net/socket.c:-1
sk_wake_async_rcu include/net/sock.h:2579 [inline]
sock_def_readable+0x3c1/0x580 net/core/sock.c:3613
unix_stream_sendmsg+0x8a3/0xe80 net/unix/af_unix.c:2480
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
____sys_sendmsg+0xa68/0xad0 net/socket.c:2592
___sys_sendmsg+0x2a5/0x360 net/socket.c:2646
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2683 [inline]
__se_sys_sendmsg net/socket.c:2681 [inline]
__x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
}
... key at: [<ffffffff9a2e6180>] fasync_insert_entry.__key+0x0/0x20
... acquired at:
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:172 [inline]
_raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:1135 [inline]
kill_fasync+0x199/0x4d0 fs/fcntl.c:1159
mousedev_notify_readers+0x6f1/0xc00 drivers/input/mousedev.c:309
mousedev_event+0x602/0x1320 drivers/input/mousedev.c:394
input_handle_events_default+0xd4/0x1a0 drivers/input/input.c:2541
input_pass_values+0x288/0x890 drivers/input/input.c:128
input_event_dispose+0x330/0x6b0 drivers/input/input.c:342
input_inject_event+0x1dd/0x340 drivers/input/input.c:424
evdev_write+0x325/0x4c0 drivers/input/evdev.c:528
vfs_write+0x29a/0xb90 fs/read_write.c:686
ksys_write+0x150/0x270 fs/read_write.c:740
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
stack backtrace:
CPU: 1 UID: 0 PID: 23959 Comm: syz.0.6889 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_bad_irq_dependency kernel/locking/lockdep.c:2616 [inline]
check_irq_usage kernel/locking/lockdep.c:2857 [inline]
check_prev_add kernel/locking/lockdep.c:3169 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x2a94/0x2cf0 kernel/locking/lockdep.c:5237
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:172 [inline]
_raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:1135 [inline]
kill_fasync+0x199/0x4d0 fs/fcntl.c:1159
mousedev_notify_readers+0x6f1/0xc00 drivers/input/mousedev.c:309
mousedev_event+0x602/0x1320 drivers/input/mousedev.c:394
input_handle_events_default+0xd4/0x1a0 drivers/input/input.c:2541
input_pass_values+0x288/0x890 drivers/input/input.c:128
input_event_dispose+0x330/0x6b0 drivers/input/input.c:342
input_inject_event+0x1dd/0x340 drivers/input/input.c:424
evdev_write+0x325/0x4c0 drivers/input/evdev.c:528
vfs_write+0x29a/0xb90 fs/read_write.c:686
ksys_write+0x150/0x270 fs/read_write.c:740
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1f91b9c629
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:00007f1f92b1f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f1f91e15fa0 RCX: 00007f1f91b9c629
RDX: 0000000000000918 RSI: 0000200000000040 RDI: 0000000000000004
RBP: 00007f1f91c32b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1f91e16038 R14: 00007f1f91e15fa0 R15: 00007f1f91f3fa48
</TASK>
---
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