syzbot


INFO: task hung in cangw_pernet_exit_batch (5)

Status: upstream: reported syz repro on 2025/12/18 20:12
Subsystems: can
[Documentation on labels]
Reported-by: syzbot+6461a4c663b104fd1169@syzkaller.appspotmail.com
First crash: 24d, last: 17d
Cause bisection: failed (error log, bisect log)
  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [can?] INFO: task hung in cangw_pernet_exit_batch (5) 1 (2) 2025/12/20 08:51
Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in cangw_pernet_exit_batch (2) can 1 16 895d 1153d 0/29 auto-obsoleted due to no activity on 2023/10/19 02:51
upstream INFO: task hung in cangw_pernet_exit_batch (3) can 1 33 541d 556d 26/29 fixed on 2024/07/09 19:14
upstream INFO: task hung in cangw_pernet_exit_batch (4) can 1 24 368d 503d 0/29 auto-obsoleted due to no activity on 2025/03/20 17:55
upstream INFO: task hung in cangw_pernet_exit_batch can 1 11 1270d 1283d 0/29 auto-obsoleted due to no activity on 2022/10/09 07:17
linux-6.1 INFO: task hung in cangw_pernet_exit_batch (2) 1 18 562d 589d 0/3 auto-obsoleted due to no activity on 2024/08/27 12:37
linux-6.1 INFO: task hung in cangw_pernet_exit_batch 1 2 940d 960d 0/3 auto-obsoleted due to no activity on 2023/09/13 14:11
Last patch testing requests (2)
Created Duration User Patch Repo Result
2025/12/28 20:06 2h18m retest repro net-next error
2025/12/28 20:37 1h39m retest repro net-next OK log

Sample crash report:
INFO: task syz.0.17:6104 blocked for more than 148 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.17        state:D stack:25440 pid:6104  tgid:6104  ppid:5956   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x14bc/0x5000 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6960
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7017
 __mutex_lock_common kernel/locking/mutex.c:692 [inline]
 __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:776
 cangw_pernet_exit_batch+0x20/0x90 net/can/gw.c:1288
 ops_exit_list net/core/net_namespace.c:205 [inline]
 ops_undo_list+0x525/0x990 net/core/net_namespace.c:252

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/14 19:59 net-next 8f7aa3d3c732 d6526ea3 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in cangw_pernet_exit_batch
2025/12/07 17:24 net-next 8f7aa3d3c732 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in cangw_pernet_exit_batch
* Struck through repros no longer work on HEAD.