INFO: task udevd:112 blocked for more than 122 seconds.
Not tainted 6.12.23-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:0 pid:112 tgid:112 ppid:1 flags:0x00004000
Call Trace:
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:6859
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1040
mutex_lock+0xd9/0xf0 kernel/locking/mutex.c:286
device_lock include/linux/device.h:1014 [inline]
uevent_show+0x1d6/0x3a0 drivers/base/core.c:2730
sysfs_kf_seq_show+0x286/0x3a0 fs/sysfs/file.c:59
seq_read_iter+0x55c/0xf10 fs/seq_file.c:230
new_sync_read fs/read_write.c:488 [inline]
vfs_read+0x53d/0xb60 fs/read_write.c:569
x64_sys_call+0x2638/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:1
RIP: 0033:0x7ff3aa8a7407
RSP: 002b:00007fffec068ac0 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007ff3aaf74880 RCX: 00007ff3aa8a7407
RDX: 0000000000001000 RSI: 000055ec8cba3700 RDI: 000000000000000c
RBP: 00007ff3aa9efff0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000a
R13: 00007ff3aa9efea0 R14: 0000000000000000 R15: 000055ec8cc1c940
INFO: task syz.0.16:475 blocked for more than 122 seconds.
Not tainted 6.12.23-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.16 state:D stack:0 pid:475 tgid:475 ppid:456 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5332 [inline]
__schedule+0xda5/0x1780 kernel/sched/core.c:6710
schedule_timeout+0xb2/0x300 kernel/time/timer.c:2592
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common+0x359/0x630 kernel/sched/completion.c:127
wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
__flush_work+0x56f/0x6e0 kernel/workqueue.c:4221
__cancel_work_sync kernel/workqueue.c:4341 [inline]
cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4378
__fput+0x1fb/0xa00 fs/file_table.c:431
____fput+0x20/0x30 fs/file_table.c:459
resume_user_mode_work+0x36/0x50 include/linux/resume_user_mode.h:50
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x64/0xb0 kernel/entry/common.c:218
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RSP: 002b:00007ffc13a49438 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 000000000000db28 RCX: 00007ffb2838e929
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007ffb285b7ba0 R08: 0000000000000001 R09: 0000000213a4972f
R10: 00007ffb28200000 R11: 0000000000000246 R12: 00007ffb285b5fac
R13: 00007ffb285b5fa0 R14: ffffffffffffffff R15: 00007ffc13a49550
INFO: task syz.2.22:486 blocked for more than 122 seconds.
Not tainted 6.12.23-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.22 state:D stack:0 pid:486 tgid:486 ppid:461 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5332 [inline]
__schedule+0xda5/0x1780 kernel/sched/core.c:6710
__schedule_loop kernel/sched/core.c:6787 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:6802
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common+0x359/0x630 kernel/sched/completion.c:127
__flush_work+0x56f/0x6e0 kernel/workqueue.c:4221
__cancel_work_sync kernel/workqueue.c:4341 [inline]
cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4378
uhid_dev_destroy drivers/hid/uhid.c:584 [inline]
uhid_char_release+0xa7/0x600 drivers/hid/uhid.c:662
__fput+0x1fb/0xa00 fs/file_table.c:431
____fput+0x20/0x30 fs/file_table.c:459
task_work_run+0x1e0/0x250 kernel/task_work.c:239
resume_user_mode_work+0x36/0x50 include/linux/resume_user_mode.h:50
do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fec7058e929
RAX: 0000000000000000 RBX: 000000000000dba9 RCX: 00007fec7058e929
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fec707b7ba0 R08: 0000000000000001 R09: 00000002779f60bf
R10: 00007fec70400000 R11: 0000000000000246 R12: 00007fec707b5fac
R13: 00007fec707b5fa0 R14: ffffffffffffffff R15: 00007ffd779f5ee0
INFO: task syz.5.24:492 blocked for more than 122 seconds.
Not tainted 6.12.23-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.24 state:D stack:0 pid:492 tgid:492 ppid:462 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5332 [inline]
__schedule+0xda5/0x1780 kernel/sched/core.c:6710
schedule_timeout+0xb2/0x300 kernel/time/timer.c:2592
wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
__cancel_work_sync kernel/workqueue.c:4341 [inline]
cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4378
uhid_dev_destroy drivers/hid/uhid.c:584 [inline]
uhid_char_release+0xa7/0x600 drivers/hid/uhid.c:662
__fput+0x1fb/0xa00 fs/file_table.c:431
____fput+0x20/0x30 fs/file_table.c:459
resume_user_mode_work+0x36/0x50 include/linux/resume_user_mode.h:50
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x64/0xb0 kernel/entry/common.c:218
do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
RIP: 0033:0x7f59aab8e929
RSP: 002b:00007ffcefa22a58 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 000000000000dbbe RCX: 00007f59aab8e929
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f59aadb7ba0 R08: 0000000000000001 R09: 00000002efa22d4f
R10: 00007f59aaa00000 R11: 0000000000000246 R12: 00007f59aadb5fac
R13: 00007f59aadb5fa0 R14: ffffffffffffffff R15: 00007ffcefa22b70
INFO: task syz.1.25:495 blocked for more than 122 seconds.
Not tainted 6.12.23-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.25 state:D stack:0 pid:495 tgid:495 ppid:458 flags:0x00000004
__schedule_loop kernel/sched/core.c:6787 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:6802
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common+0x359/0x630 kernel/sched/completion.c:127
wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
__cancel_work_sync kernel/workqueue.c:4341 [inline]
cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4378
uhid_dev_destroy drivers/hid/uhid.c:584 [inline]
uhid_char_release+0xa7/0x600 drivers/hid/uhid.c:662
__fput+0x1fb/0xa00 fs/file_table.c:431
____fput+0x20/0x30 fs/file_table.c:459
task_work_run+0x1e0/0x250 kernel/task_work.c:239
resume_user_mode_work+0x36/0x50 include/linux/resume_user_mode.h:50
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x64/0xb0 kernel/entry/common.c:218
do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f42a378e929
RSP: 002b:00007ffcef1b5b88 EFLAGS: 00000246
ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 000000000000dbd3 RCX: 00007f42a378e929
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f42a39b7ba0 R08: 0000000000000001 R09: 00000002ef1b5e7f
R10: 00007f42a3600000 R11: 0000000000000246 R12: 00007f42a39b5fac
R13: 00007f42a39b5fa0 R14: ffffffffffffffff R15: 00007ffcef1b5ca0
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.12.23-syzkaller #0 0a002ada1306be195dacc31943af3fa5ee933748
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
kthread+0x2c7/0x370 kernel/kthread.c:389
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244