INFO: task hung in register_nexthop_notifier (6)

Status: auto-obsoleted due to no activity on 2025/08/31 07:52
Subsystems: net
[Documentation on labels]
First crash: 424d, last: 424d
▶ ▼ Similar bugs (8)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 INFO: task hung in register_nexthop_notifier 1 4 777d 801d 0/3 auto-obsoleted due to no activity on 2024/09/21 15:59
upstream INFO: task hung in register_nexthop_notifier net 1 1 2043d 2043d 0/29 auto-closed as invalid on 2021/03/26 11:18
upstream INFO: task hung in register_nexthop_notifier (2) net 1 1 1747d 1747d 0/29 auto-closed as invalid on 2022/01/16 12:31
upstream INFO: task hung in register_nexthop_notifier (5) netfilter 1 5 521d 617d 0/29 auto-obsoleted due to no activity on 2025/05/26 10:08
upstream INFO: task hung in register_nexthop_notifier (7) net 1 1 307d 307d 0/29 auto-obsoleted due to no activity on 2025/12/26 02:26
upstream INFO: task hung in register_nexthop_notifier (3) net 1 44 755d 865d 26/29 fixed on 2024/07/09 19:14
linux-6.1 INFO: task hung in register_nexthop_notifier 1 3 774d 801d 0/3 auto-obsoleted due to no activity on 2024/09/25 01:20
linux-6.6 INFO: task hung in register_nexthop_notifier 1 1 239d 239d 0/2 auto-obsoleted due to no activity on 2026/03/14 08:44

Sample crash report:
INFO: task syz-executor:9880 blocked for more than 143 seconds.
      Not tainted 6.15.0-syzkaller-07774-g90b83efa6701 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:24008 pid:9880  tgid:9880  ppid:1      task_flags:0x400140 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5392 [inline]
 __schedule+0x16f5/0x4d00 kernel/sched/core.c:6781
 __schedule_loop kernel/sched/core.c:6859 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6874
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6931
 __mutex_lock_common kernel/locking/mutex.c:678 [inline]
 __mutex_lock+0x724/0xe80 kernel/locking/mutex.c:746
 register_nexthop_notifier+0x80/0x210 net/ipv4/nexthop.c:3929
 ops_init+0x35c/0x5c0 net/core/net_namespace.c:138
 setup_net+0x219/0x4b0 net/core/net_namespace.c:442
 copy_net_ns+0x32e/0x590 net/core/net_namespace.c:574
 create_new_namespaces+0x3f3/0x720 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x11c/0x170 kernel/nsproxy.c:218
 ksys_unshare+0x4c8/0x8c0 kernel/fork.c:3390
 __do_sys_unshare kernel/fork.c:3461 [inline]
 __se_sys_unshare kernel/fork.c:3459 [inline]
 __x64_sys_unshare+0x38/0x50 kernel/fork.c:3459
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f66add90167
RSP: 002b:00007ffe5a929af8 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f66adfb5f40 RCX: 00007f66add90167
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/06/02 07:47 net-next 90b83efa6701 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in register_nexthop_notifier
* Struck through repros no longer work on HEAD.