INFO: task syz.1.18:508 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.18 state:D stack:0 pid:508 tgid:508 ppid:491 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:6071 [inline]
__schedule+0x16fe/0x23d0 kernel/sched/core.c:7891
__schedule_loop kernel/sched/core.c:7966 [inline]
schedule+0xc1/0x170 kernel/sched/core.c:7981
schedule_timeout+0xc7/0x3b0 kernel/time/timer.c:2596
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common+0x368/0x650 kernel/sched/completion.c:127
wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
__flush_work+0x6a8/0xaa0 kernel/workqueue.c:4290
__cancel_work_sync kernel/workqueue.c:4411 [inline]
cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4448
uhid_dev_destroy drivers/hid/uhid.c:584 [inline]
uhid_char_release+0xa7/0x600 drivers/hid/uhid.c:662
__fput+0x20b/0xa30 fs/file_table.c:447
____fput+0x20/0x30 fs/file_table.c:475
task_work_run+0x1e8/0x260 kernel/task_work.c:246
resume_user_mode_work+0x35/0x50 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+0x63/0xb0 kernel/entry/common.c:218
do_syscall_64+0x63/0xf0 arch/x86/entry/common.c:84
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f9da8b9a379
RSP: 002b:00007fff1bb8e978 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fff1bb8ea60 RCX: 00007f9da8b9a379
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000000afab R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b32920000 R11: 0000000000000246 R12: 00007fff1bb8eaa0
R13: 00007f9da8de5fac R14: 000000000000afe5 R15: 00007f9da8de5fa0
INFO: task syz.2.22:513 blocked for more than 124 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.22 state:D stack:0 pid:513 tgid:513 ppid:492 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:6071 [inline]
__schedule+0x16fe/0x23d0 kernel/sched/core.c:7891
__schedule_loop kernel/sched/core.c:7966 [inline]
schedule+0xc1/0x170 kernel/sched/core.c:7981
schedule_timeout+0xc7/0x3b0 kernel/time/timer.c:2596
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common+0x368/0x650 kernel/sched/completion.c:127
wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
__flush_work+0x6a8/0xaa0 kernel/workqueue.c:4290
__cancel_work_sync kernel/workqueue.c:4411 [inline]
cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4448
uhid_dev_destroy drivers/hid/uhid.c:584 [inline]
uhid_char_release+0xa7/0x600 drivers/hid/uhid.c:662
__fput+0x20b/0xa30 fs/file_table.c:447
____fput+0x20/0x30 fs/file_table.c:475
task_work_run+0x1e8/0x260 kernel/task_work.c:246
resume_user_mode_work+0x35/0x50 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+0x63/0xb0 kernel/entry/common.c:218
do_syscall_64+0x63/0xf0 arch/x86/entry/common.c:84
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f6c1bf9a379
RSP: 002b:00007fff644c2848 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fff644c2930 RCX: 00007f6c1bf9a379
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000000aff7 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b32a20000 R11: 0000000000000246 R12: 00007fff644c2970
R13: 00007f6c1c1e5fac R14: 000000000000b036 R15: 00007f6c1c1e5fa0
INFO: task syz.5.17:514 blocked for more than 125 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.17 state:D stack:0 pid:514 tgid:514 ppid:488 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:6071 [inline]
__schedule+0x16fe/0x23d0 kernel/sched/core.c:7891
__schedule_loop kernel/sched/core.c:7966 [inline]
schedule+0xc1/0x170 kernel/sched/core.c:7981
schedule_timeout+0xc7/0x3b0 kernel/time/timer.c:2596
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common+0x368/0x650 kernel/sched/completion.c:127
wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
__flush_work+0x6a8/0xaa0 kernel/workqueue.c:4290
__cancel_work_sync kernel/workqueue.c:4411 [inline]
cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4448
uhid_dev_destroy drivers/hid/uhid.c:584 [inline]
uhid_char_release+0xa7/0x600 drivers/hid/uhid.c:662
__fput+0x20b/0xa30 fs/file_table.c:447
____fput+0x20/0x30 fs/file_table.c:475
task_work_run+0x1e8/0x260 kernel/task_work.c:246
resume_user_mode_work+0x35/0x50 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+0x63/0xb0 kernel/entry/common.c:218
do_syscall_64+0x63/0xf0 arch/x86/entry/common.c:84
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fd582b9a379
RSP: 002b:00007fff5a010f48 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fff5a011030 RCX: 00007fd582b9a379
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000000afef R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b32720000 R11: 0000000000000246 R12: 00007fff5a011070
R13: 00007fd582de5fac R14: 000000000000b036 R15: 00007fd582de5fa0
INFO: task syz.3.23:519 blocked for more than 125 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.23 state:D stack:0 pid:519 tgid:519 ppid:494 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:6071 [inline]
__schedule+0x16fe/0x23d0 kernel/sched/core.c:7891
__schedule_loop kernel/sched/core.c:7966 [inline]
schedule+0xc1/0x170 kernel/sched/core.c:7981
schedule_timeout+0xc7/0x3b0 kernel/time/timer.c:2596
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common+0x368/0x650 kernel/sched/completion.c:127
wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
__flush_work+0x6a8/0xaa0 kernel/workqueue.c:4290
__cancel_work_sync kernel/workqueue.c:4411 [inline]
cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4448
uhid_dev_destroy drivers/hid/uhid.c:584 [inline]
uhid_char_release+0xa7/0x600 drivers/hid/uhid.c:662
__fput+0x20b/0xa30 fs/file_table.c:447
____fput+0x20/0x30 fs/file_table.c:475
task_work_run+0x1e8/0x260 kernel/task_work.c:246
resume_user_mode_work+0x35/0x50 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+0x63/0xb0 kernel/entry/common.c:218
do_syscall_64+0x63/0xf0 arch/x86/entry/common.c:84
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7ff54339a379
RSP: 002b:00007ffdb5433028 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffdb5433110 RCX: 00007ff54339a379
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000000b03a R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b32d20000 R11: 0000000000000246 R12: 00007ffdb5433150
R13: 00007ff5435e5fac R14: 000000000000b075 R15: 00007ff5435e5fa0
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 bed7b650dccb992afefc0278d1715c62bc19d4f4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_cpu_backtrace+0x2ba/0x2d0 lib/nmi_backtrace.c:114
nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:63
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
cpumask_backtrace+0x1f/0x30 lib/nmi_backtrace.c:127
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
watchdog+0xe45/0xf90 kernel/hung_task.c:423
kthread+0x2c7/0x360 kernel/kthread.c:389
ret_from_fork+0x64/0xa0 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: 543 Comm: kworker/1:5 Not tainted syzkaller #0 bed7b650dccb992afefc0278d1715c62bc19d4f4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Workqueue: events uhid_device_add_worker
RIP: 0010:format_decode+0x864/0x1610 lib/vsprintf.c:2613
Code: 0f 85 df 03 00 00 e8 7b 51 e2 fb e9 44 02 00 00 41 83 fc 72 7e 5d 41 83 fc 73 0f 84 df 01 00 00 41 83 fc 78 0f 84 46 02 00 00 <41> 83 fc 75 0f 85 b1 03 00 00 e8 4d 51 e2 fb 48 ba 00 00 00 00 00
RSP: 0018:ffffc900012f6a28 EFLAGS: 00000293
RAX: 000000000000000a RBX: ffff000000000500 RCX: 0000000000000001
RDX: ffffffff85a70586 RSI: ffffffff8864ad20 RDI: 0000000000000075
RBP: ffffc900012f6a98 R08: ffff888104f13b40 R09: 000000000000000a
R10: 0000000000000078 R11: 0000000000000000 R12: 0000000000000075
R13: ffff000000000500 R14: ffffffff85e957a4 R15: 1ffffffff0bd2af4
FS: 0000000000000000(0000) GS:ffff8881f6d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff5a326f60 CR3: 0000000115fc4000 CR4: 00000000003526b0
Call Trace:
vsnprintf+0xe6/0x1ad0 lib/vsprintf.c:2755
sprintf+0xe8/0x140 lib/vsprintf.c:3007
print_time kernel/printk/printk.c:1387 [inline]
info_print_prefix+0x183/0x4a0 kernel/printk/printk.c:1416
record_print_text+0x182/0x4b0 kernel/printk/printk.c:1465
printk_get_next_message+0x2ab/0x9e0 kernel/printk/printk.c:3037
console_emit_next_record kernel/printk/printk.c:3108 [inline]
console_flush_all+0x3d0/0xc10 kernel/printk/printk.c:3242
__console_flush_and_unlock kernel/printk/printk.c:3301 [inline]
console_unlock+0xf8/0x2c0 kernel/printk/printk.c:3341
vprintk_emit+0x282/0x650 kernel/printk/printk.c:2462
dev_vprintk_emit+0x33c/0x400 drivers/base/core.c:4962
dev_printk_emit+0xef/0x150 drivers/base/core.c:4973
__dev_printk+0x17f/0x1b0 drivers/base/core.c:4985
_dev_warn+0x11f/0x180 drivers/base/core.c:5029
hid_parser_main+0x84d/0xde0 drivers/hid/hid-core.c:667
hid_open_report+0x87f/0x1120 drivers/hid/hid-core.c:1313
hid_parse include/linux/hid.h:1139 [inline]
hid_generic_probe+0x42/0x90 drivers/hid/hid-generic.c:66
__hid_device_probe drivers/hid/hid-core.c:2760 [inline]
hid_device_probe+0x2c5/0x690 drivers/hid/hid-core.c:2799
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2e1/0x8b0 drivers/base/dd.c:657
__driver_probe_device+0x193/0x280 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+0x264/0x300 drivers/base/bus.c:459
__device_attach+0x2c4/0x3c0 drivers/base/dd.c:1029
device_initial_probe+0x1e/0x30 drivers/base/dd.c:1078
bus_probe_device+0x18b/0x270 drivers/base/bus.c:541
device_add+0x7fd/0xbf0 drivers/base/core.c:3692
hid_add_device+0x3c4/0x5a0 drivers/hid/hid-core.c:2945
uhid_device_add_worker+0x49/0xf0 drivers/hid/uhid.c:73
process_one_work kernel/workqueue.c:3273 [inline]
process_scheduled_works+0x7f7/0x1060 kernel/workqueue.c:3354
worker_thread+0xc99/0x13f0 kernel/workqueue.c:3435
kthread+0x2c7/0x360 kernel/kthread.c:389
ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244