INFO: task hung in ip_tunnel_delete_nets (2)

Status: auto-obsoleted due to no activity on 2024/11/01 23:50
Reported-by: syzbot+d85b0d73fa0f6cb46918@syzkaller.appspotmail.com
First crash: 805d, last: 742d
▶ ▼ Similar bugs (12)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: task hung in ip_tunnel_delete_nets 1 1 1190d 1190d 0/3 auto-obsoleted due to no activity on 2023/08/23 09:02
upstream INFO: task hung in ip_tunnel_delete_nets (3) net 1 1 2158d 2158d 0/29 auto-closed as invalid on 2020/12/07 06:22
linux-6.6 INFO: task hung in ip_tunnel_delete_nets 1 1 59d 59d 0/2 upstream: reported on 2026/06/07 20:57
linux-4.19 INFO: task hung in ip_tunnel_delete_nets 1 1 1710d 1710d 0/1 auto-closed as invalid on 2022/03/29 13:03
upstream INFO: task hung in ip_tunnel_delete_nets (2) net 1 2 2270d 2282d 0/29 auto-closed as invalid on 2020/08/16 16:51
upstream INFO: task hung in ip_tunnel_delete_nets net 1 2 2486d 2490d 0/29 closed as invalid on 2019/10/23 07:54
upstream INFO: task hung in ip_tunnel_delete_nets (6) net 1 2 898d 939d 0/29 auto-obsoleted due to no activity on 2024/05/19 21:58
upstream INFO: task hung in ip_tunnel_delete_nets (4) net 1 2 1499d 1499d 0/29 auto-closed as invalid on 2022/09/26 14:02
linux-4.19 INFO: task hung in ip_tunnel_delete_nets (2) 1 1 1325d 1325d 0/1 auto-obsoleted due to no activity on 2023/04/18 11:45
linux-6.1 INFO: task hung in ip_tunnel_delete_nets (3) 1 1 224d 224d 0/3 auto-obsoleted due to no activity on 2026/04/04 00:00
linux-6.1 INFO: task hung in ip_tunnel_delete_nets (4) 1 1 70d 70d 0/3 upstream: reported on 2026/05/27 21:28
upstream INFO: task hung in ip_tunnel_delete_nets (5) net 1 15 1063d 1369d 0/29 auto-obsoleted due to no activity on 2023/12/06 23:00

Sample crash report:
INFO: task syz-executor:4039 blocked for more than 146 seconds.
      Not tainted 6.1.100-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:25000 pid:4039  ppid:1      flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6561
 schedule+0xbf/0x180 kernel/sched/core.c:6637
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6696
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
 ip_tunnel_delete_nets+0xc9/0x330 net/ipv4/ip_tunnel.c:1148
 ops_exit_list net/core/net_namespace.c:177 [inline]
 setup_net+0x939/0xb90 net/core/net_namespace.c:358
 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+0x580/0xb20 kernel/fork.c:3203
 __do_sys_unshare kernel/fork.c:3274 [inline]
 __se_sys_unshare kernel/fork.c:3272 [inline]
 __x64_sys_unshare+0x34/0x40 kernel/fork.c:3272

Crashes (9):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/07/24 23:49 linux-6.1.y 9b3f9a5b12dc d1a1b0ca .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in ip_tunnel_delete_nets
2024/06/20 16:34 linux-6.1.y eb44d83053d6 dac2aa43 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in ip_tunnel_delete_nets
2024/06/15 16:18 linux-6.1.y ae9f2a70d69e f429ab00 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in ip_tunnel_delete_nets
2024/06/15 07:09 linux-6.1.y ae9f2a70d69e f429ab00 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in ip_tunnel_delete_nets
2024/06/05 01:24 linux-6.1.y 88690811da69 e1e2c66e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in ip_tunnel_delete_nets
2024/06/04 14:10 linux-6.1.y 88690811da69 11f2afa5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in ip_tunnel_delete_nets
2024/06/01 05:14 linux-6.1.y 88690811da69 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in ip_tunnel_delete_nets
2024/05/25 00:16 linux-6.1.y 4078fa637fcd a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in ip_tunnel_delete_nets
2024/05/22 13:35 linux-6.1.y 4078fa637fcd 4d098039 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in ip_tunnel_delete_nets
* Struck through repros no longer work on HEAD.