------------[ cut here ]------------
conntrack cleanup blocked for 60s
WARNING: net/netfilter/nf_conntrack_core.c:2504 at nf_conntrack_cleanup_net_list+0x4f7/0x6e0 net/netfilter/nf_conntrack_core.c:2504, CPU#0: kworker/u8:2/19802
Modules linked in:
CPU: 0 UID: 0 PID: 19802 Comm: kworker/u8:2 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
Workqueue: netns cleanup_net
RIP: 0010:nf_conntrack_cleanup_net_list+0x4f7/0x6e0 net/netfilter/nf_conntrack_core.c:2504
Code: 29 c3 48 89 de e8 19 52 4a f8 48 85 db 78 0f e8 6f 57 4a f8 e8 3a e4 de 01 e9 0e fc ff ff e8 60 57 4a f8 48 8d 3d b9 a0 4b 07 <67> 48 0f b9 3a eb de 4c 8b 6c 24 40 e8 48 57 4a f8 48 b8 00 00 00
RSP: 0018:ffffc900077c7970 EFLAGS: 00010293
RAX: 0000000000000000 RBX: fffffffffffffffe RCX: ffffffff89bf28a7
RDX: ffff8880295eca80 RSI: ffffffff89bf28c0 RDI: ffffffff910ac980
RBP: 0000000000000001 R08: 0000000000000007 R09: 0000000000000000
R10: fffffffffffffffe R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000001 R14: ffffc900077c7b28 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8881240e0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555813dea48 CR3: 000000007ff26000 CR4: 00000000003526f0
Call Trace:
<TASK>
ops_exit_list net/core/net_namespace.c:205 [inline]
ops_undo_list+0x363/0xab0 net/core/net_namespace.c:252
cleanup_net+0x499/0x920 net/core/net_namespace.c:702
process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
process_scheduled_works kernel/workqueue.c:3405 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
----------------
Code disassembly (best guess):
0: 29 c3 sub %eax,%ebx
2: 48 89 de mov %rbx,%rsi
5: e8 19 52 4a f8 call 0xf84a5223
a: 48 85 db test %rbx,%rbx
d: 78 0f js 0x1e
f: e8 6f 57 4a f8 call 0xf84a5783
14: e8 3a e4 de 01 call 0x1dee453
19: e9 0e fc ff ff jmp 0xfffffc2c
1e: e8 60 57 4a f8 call 0xf84a5783
23: 48 8d 3d b9 a0 4b 07 lea 0x74ba0b9(%rip),%rdi # 0x74ba0e3
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: eb de jmp 0xf
31: 4c 8b 6c 24 40 mov 0x40(%rsp),%r13
36: e8 48 57 4a f8 call 0xf84a5783
3b: 48 rex.W
3c: b8 .byte 0xb8
3d: 00 00 add %al,(%rax)