syzbot

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conntrack cleanup blocked for 60s
WARNING: net/netfilter/nf_conntrack_core.c:2512 at nf_conntrack_cleanup_net_list+0x234/0x340 net/netfilter/nf_conntrack_core.c:2511, CPU#1: kworker/u8:5/18462
Modules linked in:
CPU: 1 UID: 0 PID: 18462 Comm: kworker/u8:5 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Workqueue: netns cleanup_net
RIP: 0010:nf_conntrack_cleanup_net_list+0x234/0x340 net/netfilter/nf_conntrack_core.c:2511
Code: 08 48 89 df e8 6d 27 f7 f8 4c 8b 3b 49 39 df 74 69 e8 80 c0 92 f8 45 31 e4 e9 8e fe ff ff e8 73 c0 92 f8 48 8d 3d 8c 50 25 06 <67> 48 0f b9 3a eb c0 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c cd fe ff
RSP: 0018:ffffc90004117870 EFLAGS: 00010293
RAX: ffffffff893073fd RBX: ffffc90004117a00 RCX: ffff88802c238000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8f55c490
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1006b31601 R12: 0000000000000001
R13: dffffc0000000000 R14: 0000000100029b5f R15: 0000000100029b60
FS:  0000000000000000(0000) GS:ffff8881266c9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9593724286 CR3: 000000000d9b4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ops_exit_list net/core/net_namespace.c:205 [inline]
 ops_undo_list+0x52b/0x940 net/core/net_namespace.c:252
 cleanup_net+0x4e5/0x7b0 net/core/net_namespace.c:696
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340
 worker_thread+0xda6/0x1360 kernel/workqueue.c:3421
 kthread+0x726/0x8b0 kernel/kthread.c:463
 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	48 89 df             	mov    %rbx,%rdi
   3:	e8 6d 27 f7 f8       	call   0xf8f72775
   8:	4c 8b 3b             	mov    (%rbx),%r15
   b:	49 39 df             	cmp    %rbx,%r15
   e:	74 69                	je     0x79
  10:	e8 80 c0 92 f8       	call   0xf892c095
  15:	45 31 e4             	xor    %r12d,%r12d
  18:	e9 8e fe ff ff       	jmp    0xfffffeab
  1d:	e8 73 c0 92 f8       	call   0xf892c095
  22:	48 8d 3d 8c 50 25 06 	lea    0x625508c(%rip),%rdi        # 0x62550b5
* 29:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2e:	eb c0                	jmp    0xfffffff0
  30:	89 e9                	mov    %ebp,%ecx
  32:	80 e1 07             	and    $0x7,%cl
  35:	80 c1 03             	add    $0x3,%cl
  38:	38 c1                	cmp    %al,%cl
  3a:	0f                   	.byte 0xf
  3b:	8c cd                	mov    %cs,%ebp
  3d:	fe                   	(bad)
  3e:	ff                   	.byte 0xff