syzbot


INFO: task hung in register_nexthop_notifier

Status: upstream: reported on 2024/05/20 16:42
Reported-by: syzbot+bf22523828b6bd956955@syzkaller.appspotmail.com
First crash: 30d, last: 6d03h
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in register_nexthop_notifier net 1 1271d 1271d 0/27 auto-closed as invalid on 2021/03/26 11:18
upstream INFO: task hung in register_nexthop_notifier (2) net 1 975d 975d 0/27 auto-closed as invalid on 2022/01/16 12:31
upstream INFO: task hung in register_nexthop_notifier (3) net 34 17h58m 93d 0/27 upstream: reported on 2024/03/18 11:26
linux-6.1 INFO: task hung in register_nexthop_notifier 3 2d17h 29d 0/3 upstream: reported on 2024/05/21 10:48

Sample crash report:
INFO: task syz-executor.3:3803 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:syz-executor.3  state:D stack:25120 pid: 3803 ppid:  3527 flags:0x00004006
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
 register_nexthop_notifier+0x80/0x270 net/ipv4/nexthop.c:3606
 ops_init+0x35d/0x610 net/core/net_namespace.c:138
 setup_net+0x358/0x9e0 net/core/net_namespace.c:332
 copy_net_ns+0x392/0x5d0 net/core/net_namespace.c:476
 create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x11e/0x170 kernel/nsproxy.c:226
 ksys_unshare+0x580/0xb20 kernel/fork.c:3101

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/13 15:59 linux-5.15.y c61bd26ae81a a9616ff5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in register_nexthop_notifier
2024/06/08 15:13 linux-5.15.y c61bd26ae81a 82c05ab8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in register_nexthop_notifier
2024/05/28 12:25 linux-5.15.y c61bd26ae81a f550015e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in register_nexthop_notifier
2024/05/20 16:41 linux-5.15.y 83655231580b c0f1611a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in register_nexthop_notifier
* Struck through repros no longer work on HEAD.