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INFO: task hung in ip_tunnel_init_net

Status: upstream: reported on 2024/06/04 20:15
Reported-by: syzbot+ef59f57fbce5684d83b0@syzkaller.appspotmail.com
First crash: 13d, last: 13d
▶ ▼ Similar bugs (5)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in ip_tunnel_init_net 18 880d 919d 0/1 auto-closed as invalid on 2022/05/20 09:22
upstream INFO: task hung in ip_tunnel_init_net net 2 1319d 1381d 0/27 auto-closed as invalid on 2021/02/05 10:58
linux-4.19 INFO: task hung in ip_tunnel_init_net (2) 1 499d 499d 0/1 upstream: reported on 2023/02/05 00:06
upstream INFO: task hung in ip_tunnel_init_net (2) net 3 425d 549d 0/27 auto-obsoleted due to no activity on 2023/07/18 20:51
upstream INFO: task can't die in ip_tunnel_init_net net 11 972d 973d 0/27 auto-closed as invalid on 2022/02/16 13:24

Sample crash report:
INFO: task syz-executor.4:15381 blocked for more than 143 seconds.
      Not tainted 6.1.92-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:26072 pid:15381 ppid:11031  flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x142d/0x4550 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+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
 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
RIP: 0033:0x7f9cef67cee9
RSP: 002b:00007f9cf049e0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f9cef7b3f80 RCX: 00007f9cef67cee9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000068060200
RBP: 00007f9cef6da6fe R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f9cef7b3f80 R15: 00007ffe2a475418
 </TASK>
INFO: task syz-executor.3:15388 blocked for more than 143 seconds.
      Not tainted 6.1.92-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:27240 pid:15388 ppid:10508  flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x142d/0x4550 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

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/04 20:14 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_init_net
* Struck through repros no longer work on HEAD.