INFO: task hung in cangw_pernet_exit_batch

Status: upstream: reported on 2026/10/21 11:29
Reported-by: syzbot+fbf154a98b21527ee89d@syzkaller.appspotmail.com
First crash: 10d, last: 10d
▶ ▼ Similar bugs (7)
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 1198d 1456d 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 844d 860d 26/29 fixed on 2024/07/09 19:14
upstream INFO: task hung in cangw_pernet_exit_batch (4) can 1 24 671d 806d 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 1573d 1586d 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 865d 892d 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 1244d 1263d 0/3 auto-obsoleted due to no activity on 2023/09/13 14:11
upstream INFO: task hung in cangw_pernet_exit_batch (5) prio:normal can 1 syz error error 5 207d 316d 0/29 auto-obsoleted due to no activity on 2026/07/15 20:45

Sample crash report:
INFO: task syz-executor:10583 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:25320 pid:10583 ppid:1      flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x15ae/0x4700 kernel/sched/core.c:6722
 schedule+0xbd/0x170 kernel/sched/core.c:6796
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6855
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x673/0xc80 kernel/locking/mutex.c:747
 cangw_pernet_exit_batch+0x20/0x90 net/can/gw.c:1288
 ops_exit_list net/core/net_namespace.c:178 [inline]
 setup_net+0x85a/0xa20 net/core/net_namespace.c:375

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/21 11:29 linux-6.6.y 0aebf2870d53 61c200c7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in cangw_pernet_exit_batch
* Struck through repros no longer work on HEAD.