INFO: task hung in fib6_rules_net_exit_batch (5)

Status: auto-obsoleted due to no activity on 2026/04/03 06:17
Subsystems: net
[Documentation on labels]
First crash: 363d, last: 233d
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: task hung in fib6_rules_net_exit_batch 1 2 812d 819d 0/3 auto-obsoleted due to no activity on 2024/09/12 02:11
upstream INFO: task hung in fib6_rules_net_exit_batch (4) net 1 1 472d 472d 0/29 auto-obsoleted due to no activity on 2025/08/07 06:49
upstream INFO: task hung in fib6_rules_net_exit_batch (2) net 1 10 798d 822d 0/29 auto-obsoleted due to no activity on 2024/08/06 23:39
upstream INFO: task hung in fib6_rules_net_exit_batch net 1 1 1172d 1172d 0/29 closed as invalid on 2023/09/07 14:58
upstream INFO: task hung in fib6_rules_net_exit_batch (3) net 1 8 566d 702d 0/29 auto-obsoleted due to no activity on 2025/05/05 09:06

Sample crash report:
INFO: task syz-executor:17776 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:25176 pid:17776 tgid:17776 ppid:1      task_flags:0x400140 flags:0x00080003
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1190/0x5de0 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:7026
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083
 __mutex_lock_common kernel/locking/mutex.c:676 [inline]
 __mutex_lock+0x818/0x1060 kernel/locking/mutex.c:760
 fib6_rules_net_exit_batch+0x15/0xe0 net/ipv6/fib6_rules.c:641
 ops_exit_list net/core/net_namespace.c:205 [inline]
 ops_undo_list+0x363/0xab0 net/core/net_namespace.c:252
 setup_net+0x1e2/0x390 net/core/net_namespace.c:461
 copy_net_ns+0x2f8/0x690 net/core/net_namespace.c:580
 create_new_namespaces+0x3ea/0xa90 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:218
 ksys_unshare+0x45b/0xa40 kernel/fork.c:3129

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/11/23 21:20 upstream d13f3ac64efb 4fb8ef37 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in fib6_rules_net_exit_batch
2025/08/30 13:08 upstream fb679c832b64 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in fib6_rules_net_exit_batch
2025/08/26 05:55 upstream b6add54ba618 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in fib6_rules_net_exit_batch
2026/01/03 06:12 net-next dbf8fe85a16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in fib6_rules_net_exit_batch
* Struck through repros no longer work on HEAD.