kernel panic: hung_task: blocked tasks

kernel panic: hung_task: blocked tasks

Status: closed as invalid on 2018/04/01 11:45
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+bca5bf3f416a9b06754d@syzkaller.appspotmail.com
First crash: 2232d, last: 2229d

▶ ▼ Similar bugs (1)

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	kernel panic: hung_task: blocked tasks (2) kernel	C	done		21	2d22h	291d	0/26	upstream: reported C repro on 2023/07/21 20:48

Sample crash report:

unregister_netdevice: waiting for lo to become free. Usage count = 3
unregister_netdevice: waiting for lo to become free. Usage count = 3
unregister_netdevice: waiting for lo to become free. Usage count = 3
unregister_netdevice: waiting for lo to become free. Usage count = 3
Kernel panic - not syncing: hung_task: blocked tasks
CPU: 0 PID: 877 Comm: khungtaskd Not tainted 4.16.0-rc7+ #9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 check_hung_task kernel/hung_task.c:133 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline]
 watchdog+0x91d/0xd60 kernel/hung_task.c:249
 kthread+0x33c/0x400 kernel/kthread.c:238
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (4):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Manager
2018/04/01 02:38	upstream	10b84daddbec	0174c6c8	.config	console log	report	ci-upstream-kasan-gce-root
2018/03/29 18:59	upstream	0b412605ef5f	d47f0ed6	.config	console log	report	ci-upstream-kasan-gce-root
2018/03/29 14:09	upstream	0b412605ef5f	d47f0ed6	.config	console log	report	ci-upstream-kasan-gce-root
2018/03/28 06:26	upstream	3eb2ce825ea1	bf5e585c	.config	console log	report	ci-upstream-kasan-gce-root

* ~~Struck through~~ repros no longer work on HEAD.