syzbot


INFO: task hung in kernfs_remove

Status: auto-closed as invalid on 2019/08/31 16:46
Reported-by: syzbot+256bac544b3ac63102a1@syzkaller.appspotmail.com
First crash: 1933d, last: 1933d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in kernfs_remove 1 1677d 1677d 0/1 auto-closed as invalid on 2020/03/15 06:19

Sample crash report:
[14478]     0 14478    19190    17126      43       3        0         -1000 blkid
[14479]     0 14479    16958    14901      40       3        0         -1000 blkid
[14480]     0 14480    19058    17002      44       3        0         -1000 blkid
[14481]     0 14481     5518      293      16       3        0         -1000 udevd
[14482]     0 14482     5518      293      16       3        0         -1000 udevd
INFO: task kworker/u4:7:2151 blocked for more than 140 seconds.
      Not tainted 4.14.104+ #22
[14483]     0 14483     5518      293      16       3        0         -1000 udevd
[14484]     0 14484     5518      294      16       3        0         -1000 udevd
[14485]     0 14485    18924    16871      44       3        0         -1000 blkid
[14486]     0 14486    17908    15823      41       3        0         -1000 blkid
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:7    D26536  2151      2 0x80000000
Workqueue: netns cleanup_net
[14487]     0 14487    17716    15625      41       4        0         -1000 blkid
Call Trace:
[14488]     0 14488     5518      294      16       3        0         -1000 udevd
[14489]     0 14489    17438    15363      41       3        0         -1000 blkid
[14490]     0 14490    18180    16089      56       4        0         -1000 blkid
[14491]     0 14491    18294    16210      43       3        0         -1000 blkid
 schedule+0x92/0x1c0 kernel/sched/core.c:3492
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3550
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
[14492]     0 14492    18142    16081      41       3        0         -1000 blkid
[14493]     0 14493     5518      294      16       3        0         -1000 udevd
[14494]     0 14494     5518      295      16       3        0         -1000 udevd
[14495]     0 14495     5518      294      16       3        0         -1000 udevd
[14496]     0 14496     5518      294      16       3        0         -1000 udevd
[14497]     0 14497     5518      294      16       3        0         -1000 udevd
 kernfs_remove+0x17/0x30 fs/kernfs/dir.c:1329
 sysfs_remove_dir+0xb1/0xf0 fs/sysfs/dir.c:97
[14498]     0 14498     5518      294      16       3        0         -1000 udevd
[14499]     0 14499    17538    15495      41       3        0         -1000 blkid
 kobject_del.part.0+0x35/0xe0 lib/kobject.c:575
 kobject_del lib/kobject.c:571 [inline]
 kobject_cleanup lib/kobject.c:640 [inline]
 kobject_release lib/kobject.c:675 [inline]
 kref_put include/linux/kref.h:70 [inline]
 kobject_put+0x103/0x200 lib/kobject.c:692
[14503]     0 14503    17122    15085      40       3        0         -1000 blkid
[14504]     0 14504    17106    15033      41       3        0         -1000 blkid
[14505]     0 14505     5518      295      16       3        0         -1000 udevd
[14506]     0 14506    16118    14041      37       3        0         -1000 blkid
[14507]     0 14507    16856    14770      39       3        0         -1000 blkid
[14508]     0 14508    17752    15692      42       3        0         -1000 blkid
[14509]     0 14509     5518      295      16       3        0         -1000 udevd
[14510]     0 14510     5518      295      16       3        0         -1000 udevd
[14511]     0 14511    17412    15363      42       3        0         -1000 blkid
[14512]     0 14512     5518      295      16       3        0         -1000 udevd
[14513]     0 14513     5518      295      16       3        0         -1000 udevd
[14514]     0 14514     5518      295      16       3        0         -1000 udevd
[14515]     0 14515     5518      296      16       3        0         -1000 udevd
INFO: task kworker/0:4:15753 blocked for more than 140 seconds.
[14518]     0 14518    16664    14629      39       4        0         -1000 blkid
      Not tainted 4.14.104+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[14519]     0 14519     5518      295      16       3        0         -1000 udevd
kworker/0:4     D27312 15753      2 0x80000000
[14520]     0 14520     5518      295      16       3        0         -1000 udevd
Workqueue: ipv6_addrconf addrconf_verify_work
[14522]     0 14522    15570    13515      38       3        0         -1000 blkid
[14523]     0 14523    16620    14571      39       3        0         -1000 blkid
Call Trace:
[14524]     0 14524    15994    13911      38       3        0         -1000 blkid
[14526]     0 14526     5518      295      16       3        0         -1000 udevd
[14528]     0 14528     5518      295      16       3        0         -1000 udevd
 schedule+0x92/0x1c0 kernel/sched/core.c:3492
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3550
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
[14529]     0 14529     5518      295      16       3        0         -1000 udevd
[14530]     0 14530    15790    13712      38       3        0         -1000 blkid
[14531]     0 14531    15480    13443      38       3        0         -1000 blkid
[14532]     0 14532    17362    15297      40       3        0         -1000 blkid
 addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4431
 process_one_work+0x7c6/0x14e0 kernel/workqueue.c:2114
 worker_thread+0x5d7/0x1080 kernel/workqueue.c:2248
[14533]     0 14533    16438    14371      39       3        0         -1000 blkid
[14534]     0 14534    15428    13384      37       3        0         -1000 blkid
[14535]     0 14535     5518      295      16       3        0         -1000 udevd
 kthread+0x310/0x420 kernel/kthread.c:232
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402
INFO: task udevd:14803 blocked for more than 140 seconds.
[14536]     0 14536     5518      295      16       3        0         -1000 udevd
[14537]     0 14537    15082    12986      37       3        0         -1000 blkid

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/03/04 16:45 android-4.14 934272e9380b 7c693b52 .config console log report ci-android-414-kasan-gce-root
* Struck through repros no longer work on HEAD.