INFO: task syz.4.20:513 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.20 state:D
stack:0 pid:513 tgid:513 ppid:503 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
schedule_timeout+0xb2/0x3a0 kernel/time/timer.c:2595
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+0x6d2/0xac0 kernel/workqueue.c:4233
__cancel_work_sync kernel/workqueue.c:4354 [inline]
cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4391
uhid_dev_destroy drivers/hid/uhid.c:584 [inline]
uhid_char_release+0xa7/0x600 drivers/hid/uhid.c:662
__fput+0x1fe/0xa00 fs/file_table.c:429
____fput+0x20/0x30 fs/file_table.c:457
task_work_run+0x1e0/0x250 kernel/task_work.c:240
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: 0033:0x7fdab0b8e929
RSP: 002b:00007fff2971f2d8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 0000000000015151 RCX: 00007fdab0b8e929
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fdab0db7ba0 R08: 0000000000000001 R09: 000000032971f5cf
R10: 00007fdab0a00000 R11: 0000000000000246 R12: 00007fdab0db5fac
R13: 00007fdab0db5fa0 R14: ffffffffffffffff R15: 00007fff2971f3f0
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 6107e467a997fac531622576564f0bb035945bcf
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x10c/0x190 lib/dump_stack.c:120
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_cpu_backtrace+0x2bf/0x2d0 lib/nmi_backtrace.c:113
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
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
watchdog+0xd8f/0xed0 kernel/hung_task.c:423
kthread+0x2ca/0x370 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 549 Comm: kworker/1:5 Not tainted syzkaller #0 6107e467a997fac531622576564f0bb035945bcf
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: events uhid_device_add_worker
RIP: 0010:__sanitizer_cov_trace_pc+0x5/0x70 kernel/kcov.c:210
Code: e8 a0 42 52 00 5b 5d e9 99 6d 09 04 cc cc cc cc cc cc cc cc cc b8 20 24 e0 bf 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <48> 89 e5 48 8b 45 08 65 48 8b 0c 25 00 eb 04 00 65 8b 15 0c ed 7e
RSP: 0018:ffffc900013d68c0 EFLAGS: 00000293
RAX: ffffffff85896103 RBX: 000000000000000a RCX: ffff888120093900
RDX: 0000000000000000 RSI: 000000000000000a RDI: 0000000005f5e0ff
RBP: ffffc900013d68f0 R08: ffffc900013d6997 R09: 0000000000000000
R10: ffffc900013d6980 R11: fffff5200027ad33 R12: 0000000000ffff0a
R13: 000000000000000a R14: ffffc900013d6980 R15: 000000000000000a
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557d2a84a8 CR3: 000000010b750000 CR4: 00000000003526b0
Call Trace:
number+0x30a/0xf80 lib/vsprintf.c:511
vsnprintf+0x1380/0x1aa0 lib/vsprintf.c:2869
snprintf+0xdb/0x130 lib/vsprintf.c:2938
print_caller kernel/printk/printk.c:1399 [inline]
info_print_prefix+0x22e/0x480 kernel/printk/printk.c:1418
record_print_text+0x155/0x430 kernel/printk/printk.c:1465
printk_get_next_message+0x273/0x930 kernel/printk/printk.c:3038
console_emit_next_record kernel/printk/printk.c:3106 [inline]
console_flush_all+0x3a4/0xaa0 kernel/printk/printk.c:3240
__console_flush_and_unlock kernel/printk/printk.c:3299 [inline]
console_unlock+0xe9/0x270 kernel/printk/printk.c:3339
vprintk_emit+0x27c/0x640 kernel/printk/printk.c:2463
dev_vprintk_emit+0x33b/0x400 drivers/base/core.c:4962
dev_printk_emit+0xe1/0x130 drivers/base/core.c:4973
__dev_printk+0x17f/0x1b0 drivers/base/core.c:4985
_dev_warn+0x10b/0x160 drivers/base/core.c:5029
hid_parser_main+0x84b/0xdc0 drivers/hid/hid-core.c:632
hid_open_report+0x868/0x1110 drivers/hid/hid-core.c:1278
hid_parse include/linux/hid.h:1138 [inline]
hid_generic_probe+0x42/0x90 drivers/hid/hid-generic.c:66
__hid_device_probe drivers/hid/hid-core.c:2711 [inline]
hid_device_probe+0x2c1/0x5d0 drivers/hid/hid-core.c:2748
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2d6/0x890 drivers/base/dd.c:657
__driver_probe_device+0x198/0x280 drivers/base/dd.c:799
driver_probe_device+0x54/0x3f0 drivers/base/dd.c:829
__device_attach_driver+0x2f1/0x4b0 drivers/base/dd.c:957
bus_for_each_drv+0x260/0x2f0 drivers/base/bus.c:459
__device_attach+0x2bd/0x3a0 drivers/base/dd.c:1029
device_initial_probe+0x1e/0x30 drivers/base/dd.c:1078
bus_probe_device+0x18b/0x270 drivers/base/bus.c:534
device_add+0x80c/0xc00 drivers/base/core.c:3692
hid_add_device+0x39b/0x560 drivers/hid/hid-core.c:2894
uhid_device_add_worker+0x49/0xf0 drivers/hid/uhid.c:73
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0x7d2/0x1020 kernel/workqueue.c:3319
worker_thread+0xc58/0x1250 kernel/workqueue.c:3400
kthread+0x2ca/0x370 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244