syzbot


INFO: task hung in ppp_exit_net

Status: upstream: reported on 2024/05/27 17:46
Reported-by: syzbot+25c310f6fa67cd864323@syzkaller.appspotmail.com
First crash: 23d, last: 23d
Similar bugs (5)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in ppp_exit_net (2) ppp 1 471d 471d 0/27 auto-obsoleted due to no activity on 2023/06/04 05:29
upstream INFO: task hung in ppp_exit_net (3) ppp 1 308d 308d 0/27 auto-obsoleted due to no activity on 2023/11/13 21:08
upstream INFO: task hung in ppp_exit_net (4) ppp 63 4h09m 6d10h 0/27 upstream: reported on 2024/06/13 09:12
upstream INFO: task hung in ppp_exit_net ppp 1 721d 721d 0/27 auto-closed as invalid on 2022/09/27 15:01
linux-6.1 INFO: task hung in ppp_exit_net 1 28d 28d 0/3 upstream: reported on 2024/05/22 06:26

Sample crash report:
INFO: task kworker/u4:1:144 blocked for more than 143 seconds.
      Not tainted 5.15.160-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:1    state:D stack:23224 pid:  144 ppid:     2 flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1f0 kernel/sched/core.c:6459
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6518
 __mutex_lock_common+0xe34/0x25a0 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 ppp_exit_net+0xe0/0x3b0 drivers/net/ppp/ppp_generic.c:1128

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/27 17:45 linux-5.15.y c61bd26ae81a 761766e6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in ppp_exit_net
* Struck through repros no longer work on HEAD.