INFO: task hung in uhid_char

Date	Name	Commit	Repro	Result
2025/09/13	linux-6.6.y (ToT)	60a9e718726f	syz	[report] INFO: task hung in uhid_char_release
2025/09/13	upstream (ToT)	22f20375f5b7	syz	Didn't crash

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: task hung in uhid_char_release input	1	C	done	done	479	53d	838d	0/29	upstream: reported C repro on 2023/06/24 03:16
android-6-12	INFO: task hung in uhid_char_release origin:upstream	1	C			10	10d	111d	0/1	premoderation: reported C repro on 2025/06/19 10:50

Kernel

Title

Rank 🛈

upstream

INFO: task hung in uhid_char_release input

done

479

53d

838d

0/29

upstream: reported C repro on 2023/06/24 03:16

android-6-12

INFO: task hung in uhid_char_release origin:upstream

10d

111d

0/1

premoderation: reported C repro on 2025/06/19 10:50

INFO: task syz.1.18:6035 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.18 state:D stack:26664 pid:6035 ppid:5924 flags:0x00004004 Call Trace: <TASK> context_switch kernel/sched/core.c:5380 [inline] __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699 schedule+0xbd/0x170 kernel/sched/core.c:6773 schedule_timeout+0x9b/0x280 kernel/time/timer.c:2143 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion+0x2bd/0x590 kernel/sched/completion.c:148 __flush_work+0x895/0x9f0 kernel/workqueue.c:3430 __cancel_work_timer+0x3b0/0x520 kernel/workqueue.c:3517 uhid_dev_destroy drivers/hid/uhid.c:585 [inline] uhid_char_release+0xaf/0x600 drivers/hid/uhid.c:663 __fput+0x234/0x970 fs/file_table.c:384 task_work_run+0x1ce/0x250 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f3168b8eba9 RSP: 002b:00007ffface5ff28 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 000000000002eb0f RCX: 00007f3168b8eba9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000001 R09: 00000002ace6021f R10: 0000001b2e020000 R11: 0000000000000246 R12: 00007f3168dd5fac R13: 00007f3168dd5fa0 R14: ffffffffffffffff R15: 0000000000000003 </TASK> INFO: task syz.2.19:6037 blocked for more than 145 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.19 state:D stack:26664 pid:6037 ppid:5927 flags:0x00004004 Call Trace: <TASK> context_switch kernel/sched/core.c:5380 [inline] __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699 schedule+0xbd/0x170 kernel/sched/core.c:6773 schedule_timeout+0x9b/0x280 kernel/time/timer.c:2143 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion+0x2bd/0x590 kernel/sched/completion.c:148 __flush_work+0x895/0x9f0 kernel/workqueue.c:3430 __cancel_work_timer+0x3b0/0x520 kernel/workqueue.c:3517 uhid_dev_destroy drivers/hid/uhid.c:585 [inline] uhid_char_release+0xaf/0x600 drivers/hid/uhid.c:663 __fput+0x234/0x970 fs/file_table.c:384 task_work_run+0x1ce/0x250 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f7a5418eba9 RSP: 002b:00007fff59b5bd98 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 000000000002f361 RCX: 00007f7a5418eba9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000259b5c08f R10: 0000001b2e220000 R11: 0000000000000246 R12: 00007f7a543d5fac R13: 00007f7a543d5fa0 R14: ffffffffffffffff R15: 0000000000000003 </TASK> INFO: task syz.4.25:6084 blocked for more than 147 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.25 state:D stack:27592 pid:6084 ppid:6039 flags:0x00004004 Call Trace: <TASK> context_switch kernel/sched/core.c:5380 [inline] __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699 schedule+0xbd/0x170 kernel/sched/core.c:6773 schedule_timeout+0x9b/0x280 kernel/time/timer.c:2143 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion+0x2bd/0x590 kernel/sched/completion.c:148 __flush_work+0x895/0x9f0 kernel/workqueue.c:3430 __cancel_work_timer+0x3b0/0x520 kernel/workqueue.c:3517

Crashes (3):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	Assets (help?)	Manager	Title
2025/09/11 14:29	linux-6.6.y	fe9731e10004	fdeaa69b	.config	console log	report	syz / log	[disk image] [vmlinux] [kernel image]	ci2-linux-6-6-kasan	INFO: task hung in uhid_char_release
2025/09/11 12:58	linux-6.6.y	fe9731e10004	fdeaa69b	.config	console log	report	syz / log	[disk image] [vmlinux] [kernel image]	ci2-linux-6-6-kasan	INFO: task hung in uhid_char_release
2025/09/09 09:35	linux-6.6.y	355bd0b51d2f	d291dd2d	.config	console log	report	syz / log	[disk image] [vmlinux] [kernel image]	ci2-linux-6-6-kasan	INFO: task hung in uhid_char_release

Crashes (3):

Assets (help?)