| Date | Name | Commit | Repro | Result |
|---|---|---|---|---|
| 2025/06/20 | lts (merge base) | 83b4161a63b8 | C | [report] INFO: task hung in uevent_show |
| 2025/06/20 | upstream (ToT) | 75f5f23f8787 | C | [report] INFO: task hung in uhid_char_release |
syzbot |
sign-in | mailing list | source | docs |
| Date | Name | Commit | Repro | Result |
|---|---|---|---|---|
| 2025/06/20 | lts (merge base) | 83b4161a63b8 | C | [report] INFO: task hung in uevent_show |
| 2025/06/20 | upstream (ToT) | 75f5f23f8787 | C | [report] INFO: task hung in uhid_char_release |
| Kernel | Title | Rank 🛈 | Repro | Cause bisect | Fix bisect | Count | Last | Reported | Patched | Status |
|---|---|---|---|---|---|---|---|---|---|---|
| linux-6.6 | INFO: task hung in uhid_char_release origin:lts-only | 1 | C | error | 12 | 3d14h | 239d | 0/2 | upstream: reported C repro on 2025/09/09 09:36 | |
| upstream | INFO: task hung in uhid_char_release input | 1 | C | done | done | 479 | 263d | 1048d | 0/29 | upstream: reported C repro on 2023/06/24 03:16 |
| Created | Duration | User | Patch | Repo | Result |
|---|---|---|---|---|---|
| 2026/04/10 05:05 | 22m | retest repro | android16-6.12 | report log | |
| 2026/03/20 12:00 | 10m | retest repro | android16-6.12 | report log | |
| 2026/03/20 12:00 | 10m | retest repro | android16-6.12 | report log | |
| 2026/03/20 12:00 | 12m | retest repro | android16-6.12 | report log | |
| 2026/03/20 12:00 | 12m | retest repro | android16-6.12 | report log | |
| 2026/03/20 12:00 | 35m | retest repro | android16-6.12 | report log | |
| 2025/12/29 07:57 | 4m | retest repro | android16-6.12 | error | |
| 2025/12/08 07:54 | 7m | retest repro | android16-6.12 | error | |
| 2025/12/08 07:54 | 3m | retest repro | android16-6.12 | error | |
| 2025/12/08 07:54 | 3m | retest repro | android16-6.12 | error |
INFO: task syz.2.19:400 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.19 state:D
stack:0 pid:400 tgid:400 ppid:382 flags:0x00000004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:6026 [inline]
__schedule+0x1399/0x1fa0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7961 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7976
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+0x369/0x650 kernel/sched/completion.c:127
wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
__flush_work+0x712/0xb10 kernel/workqueue.c:4278
__cancel_work_sync kernel/workqueue.c:4399 [inline]
cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4436
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+0x1e5/0x260 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: 0033:0x7fb8bdf9cdd9
RSP: 002b:00007ffccf598c18 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffccf598d00 RCX: 00007fb8bdf9cdd9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000001e7f6 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b33d20000 R11: 0000000000000246 R12: 00007ffccf598d40
R13: 00007fb8be215fac R14: 000000000001e83f R15: 00007fb8be215fa0
</TASK>
INFO: task syz.5.21:404 blocked for more than 124 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.21 state:D
stack:0 pid:404 tgid:404 ppid:379 flags:0x00000004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:6026 [inline]
__schedule+0x1399/0x1fa0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7961 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7976
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+0x369/0x650 kernel/sched/completion.c:127
wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
__flush_work+0x712/0xb10 kernel/workqueue.c:4278
__cancel_work_sync kernel/workqueue.c:4399 [inline]
cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4436
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+0x1e5/0x260 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: 0033:0x7fdc3d59cdd9
RSP: 002b:00007ffd2e42f978 EFLAGS: 00000246
ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffd2e42fa60 RCX: 00007fdc3d59cdd9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000001e839 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b33920000 R11: 0000000000000246 R12: 00007ffd2e42faa0
R13: 00007fdc3d815fac R14: 000000000001e871 R15: 00007fdc3d815fa0
</TASK>
INFO: task syz.1.22:410 blocked for more than 125 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.22 state:D
stack:0 pid:410 tgid:410 ppid:380 flags:0x00000004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:6026 [inline]
__schedule+0x1399/0x1fa0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7961 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7976
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+0x369/0x650 kernel/sched/completion.c:127
wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
__flush_work+0x712/0xb10 kernel/workqueue.c:4278
__cancel_work_sync kernel/workqueue.c:4399 [inline]
cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4436
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+0x1e5/0x260 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: 0033:0x7f6ef619cdd9
RSP: 002b:00007ffc7cbf8f98 EFLAGS: 00000246
ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffc7cbf9080 RCX: 00007f6ef619cdd9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000001e851 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b33a20000 R11: 0000000000000246 R12: 00007ffc7cbf90c0
R13: 00007f6ef6415fac R14: 000000000001e885 R15: 00007f6ef6415fa0
</TASK>
INFO: task syz.3.24:414 blocked for more than 126 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.24 state:D
stack:0 pid:414 tgid:414 ppid:384 flags:0x00000004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:6026 [inline]
__schedule+0x1399/0x1fa0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7961 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7976
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+0x369/0x650 kernel/sched/completion.c:127
wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
__flush_work+0x712/0xb10 kernel/workqueue.c:4278
__cancel_work_sync kernel/workqueue.c:4399 [inline]
cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4436
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+0x1e5/0x260 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: 0033:0x7fbfa299cdd9
RSP: 002b:00007fff12bc1168 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fff12bc1250 RCX: 00007fbfa299cdd9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000001e88f R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b33f20000 R11: 0000000000000246 R12: 00007fff12bc1290
R13: 00007fbfa2c15fac R14: 000000000001e8cf R15: 00007fbfa2c15fa0
</TASK>
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 2d55ab0d08d30afb2392ba3a535ea3e888ff1e10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
<TASK>
__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: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+0xdad/0xf00 kernel/hung_task.c:423
kthread+0x2c9/0x370 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
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 559 Comm: kworker/0:8 Not tainted syzkaller #0 2d55ab0d08d30afb2392ba3a535ea3e888ff1e10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: events uhid_device_add_worker
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline]
RIP: 0010:panic_in_progress kernel/printk/printk.c:353 [inline]
RIP: 0010:console_lock_spinning_enable kernel/printk/printk.c:1924 [inline]
RIP: 0010:console_emit_next_record kernel/printk/printk.c:3145 [inline]
RIP: 0010:console_flush_all+0x569/0xac0 kernel/printk/printk.c:3239
Code: 24 38 42 c6 44 20 04 f8 fa e8 13 5e 00 00 48 c7 c7 80 9c 4f 87 be 04 00 00 00 e8 52 08 77 00 49 c7 c7 80 9c 4f 87 49 c1 ef 03 <43> 0f b6 04 27 84 c0 0f 85 e1 03 00 00 8b 1d 24 74 e6 05 bf ff ff
RSP: 0018:ffffc90001586fe0 EFLAGS: 00000806
RAX: ffffffff81698601 RBX: 0000000000000001 RCX: ffffffff8169283e
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff874f9c80
RBP: ffffc90001587110 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0e9f390 R12: dffffc0000000000
R13: ffffffff878f8600 R14: 0000000000000000 R15: 1ffffffff0e9f390
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffddda2ce60 CR3: 0000000136fda000 CR4: 00000000003526b0
Call Trace:
<TASK>
__console_flush_and_unlock kernel/printk/printk.c:3298 [inline]
console_unlock+0xf8/0x2c0 kernel/printk/printk.c:3338
vprintk_emit+0x282/0x650 kernel/printk/printk.c:2462
dev_vprintk_emit+0x359/0x420 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+0x84b/0xdc0 drivers/hid/hid-core.c:664
hid_open_report+0x876/0x1110 drivers/hid/hid-core.c:1310
hid_parse include/linux/hid.h:1137 [inline]
hid_generic_probe+0x42/0x90 drivers/hid/hid-generic.c:66
__hid_device_probe drivers/hid/hid-core.c:2703 [inline]
hid_device_probe+0x2c1/0x5d0 drivers/hid/hid-core.c:2740
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2d8/0x890 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+0x264/0x300 drivers/base/bus.c:459
__device_attach+0x2c9/0x3c0 drivers/base/dd.c:1029
device_initial_probe+0x1e/0x30 drivers/base/dd.c:1078
bus_probe_device+0x18b/0x270 drivers/base/bus.c:534
device_add+0x80c/0xbf0 drivers/base/core.c:3692
hid_add_device+0x39b/0x560 drivers/hid/hid-core.c:2886
uhid_device_add_worker+0x49/0xf0 drivers/hid/uhid.c:73
process_one_work kernel/workqueue.c:3261 [inline]
process_scheduled_works+0x7d4/0x1020 kernel/workqueue.c:3342
worker_thread+0xc51/0x1370 kernel/workqueue.c:3423
kthread+0x2c9/0x370 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
</TASK>
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026/05/03 20:31 | android16-6.12 | 8ed163f1fc8c | a0d91488 | .config | console log | report | syz / log | C | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release | |
| 2025/09/14 20:26 | android16-6.12 | 0668e45a4339 | e2beed91 | .config | console log | report | syz / log | C | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release | |
| 2025/08/31 17:16 | android16-6.12 | 6879524e1c5a | 807a3b61 | .config | console log | report | syz / log | C | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release | |
| 2025/07/24 18:19 | android16-6.12 | 379b99745e88 | 65d60d73 | .config | strace log | report | syz / log | C | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release | |
| 2025/06/19 10:49 | android16-6.12 | 30b14cdad458 | ed3e87f7 | .config | strace log | report | syz / log | C | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release | |
| 2026/02/08 13:48 | android16-6.12 | 6aeca23b5dee | 4c131dc4 | .config | console log | report | syz / log | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release | ||
| 2025/06/19 13:40 | android16-6.12 | 30b14cdad458 | ed3e87f7 | .config | console log | report | syz / log | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release | ||
| 2026/04/28 01:27 | android16-6.12 | 18d3876842e1 | ce741359 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release | ||
| 2026/04/19 02:45 | android16-6.12 | 6532ca3bb1f7 | 303e2802 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release | ||
| 2026/04/17 12:49 | android16-6.12 | 100d1d1c17f8 | de0a551d | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release | ||
| 2026/03/27 03:22 | android16-6.12 | d73a8ddf419e | 766b6434 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release | ||
| 2026/03/06 01:57 | android16-6.12 | 6a6bc2e596fe | 31e9c887 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release | ||
| 2026/02/28 01:10 | android16-6.12 | 9791d9d4829d | 2cf092b8 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release | ||
| 2026/02/21 05:57 | android16-6.12 | 7712ca595283 | 6e7b5511 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release | ||
| 2025/11/04 07:03 | android16-6.12 | 0d6730ee6542 | 686bf657 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release | ||
| 2025/10/31 11:06 | android16-6.12 | 0d6730ee6542 | 2c50b6a9 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release | ||
| 2025/09/02 21:40 | android16-6.12 | 4ae522d0f966 | 96a211bc | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release | ||
| 2025/07/26 23:18 | android16-6.12 | e9bbc29c066a | fb8f743d | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release | ||
| 2025/07/17 07:57 | android16-6.12 | 3bff0858a069 | 44f8051e | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release | ||
| 2025/07/15 08:50 | android16-6.12 | 2bd1f3631412 | 03fcfc4b | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release | ||
| 2025/07/08 18:13 | android16-6.12 | 15d2fe054444 | 4d9fdfa4 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in uhid_char_release |