INFO: task hung in ip_tunnel_init_net (2)

Status: auto-obsoleted due to no activity on 2025/03/15 13:31
Reported-by: syzbot+5e3915d42e84afc822b5@syzkaller.appspotmail.com
First crash: 606d, last: 606d
▶ ▼ Similar bugs (9)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 INFO: task hung in ip_tunnel_init_net 1 1 626d 626d 0/3 auto-obsoleted due to no activity on 2025/02/23 13:12
upstream INFO: task hung in ip_tunnel_init_net (3) netfilter 1 41 630d 662d 28/29 fixed on 2024/11/12 23:31
linux-6.1 INFO: task hung in ip_tunnel_init_net 1 2 755d 790d 0/3 auto-obsoleted due to no activity on 2024/10/18 03:42
linux-4.19 INFO: task hung in ip_tunnel_init_net 1 18 1657d 1696d 0/1 auto-closed as invalid on 2022/05/20 09:22
upstream INFO: task hung in ip_tunnel_init_net net 1 2 2096d 2158d 0/29 auto-closed as invalid on 2021/02/05 10:58
linux-4.19 INFO: task hung in ip_tunnel_init_net (2) 1 1 1276d 1276d 0/1 upstream: reported on 2023/02/05 00:06
upstream INFO: task hung in ip_tunnel_init_net (4) net 1 9 490d 622d 0/29 auto-obsoleted due to no activity on 2025/06/30 02:27
upstream INFO: task hung in ip_tunnel_init_net (2) net 1 3 1202d 1326d 0/29 auto-obsoleted due to no activity on 2023/07/18 20:51
upstream INFO: task can't die in ip_tunnel_init_net net 1 11 1749d 1750d 0/29 auto-closed as invalid on 2022/02/16 13:24

Sample crash report:
INFO: task syz-executor:7519 blocked for more than 143 seconds.
      Not tainted 6.1.119-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:22760 pid:7519  ppid:1      flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
 ip_tunnel_init_net+0x20f/0x700 net/ipv4/ip_tunnel.c:1099
 ops_init+0x35d/0x610 net/core/net_namespace.c:138
 setup_net+0x4b5/0xb90 net/core/net_namespace.c:335
 copy_net_ns+0x392/0x5d0 net/core/net_namespace.c:481
 create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x11e/0x170 kernel/nsproxy.c:226
 ksys_unshare+0x531/0xa40 kernel/fork.c:3201
 __do_sys_unshare kernel/fork.c:3272 [inline]
 __se_sys_unshare kernel/fork.c:3270 [inline]
 __x64_sys_unshare+0x34/0x40 kernel/fork.c:3270
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/12/05 13:30 linux-6.1.y e4d90d63d385 29f61fce .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: task hung in ip_tunnel_init_net
* Struck through repros no longer work on HEAD.