------------[ cut here ]------------
conntrack cleanup blocked for 60s
WARNING: net/netfilter/nf_conntrack_core.c:2504 at nf_conntrack_cleanup_net_list+0x234/0x340 net/netfilter/nf_conntrack_core.c:2503, CPU#1: kworker/u8:57/21589
Modules linked in:
CPU: 1 UID: 0 PID: 21589 Comm: kworker/u8:57 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: netns cleanup_net
RIP: 0010:nf_conntrack_cleanup_net_list+0x234/0x340 net/netfilter/nf_conntrack_core.c:2503
Code: 08 48 89 df e8 6d 38 63 f8 4c 8b 3b 49 39 df 74 69 e8 10 e6 f8 f7 45 31 e4 e9 8e fe ff ff e8 03 e6 f8 f7 48 8d 3d 5c 34 54 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:ffffc900048af8b0 EFLAGS: 00010293
RAX: ffffffff89ccc9ed RBX: ffffc900048afa50 RCX: ffff88806db00000
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: ffffffff9020fe50
RBP: 0000000000000001 R08: ffff8880318acc03 R09: 1ffff11006315980
R10: dffffc0000000000 R11: ffffed1006315981 R12: 0000000000000001
R13: dffffc0000000000 R14: 0000000100012dca R15: 0000000100012dcb
FS:  0000000000000000(0000) GS:ffff88812554a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd76f1e9f00 CR3: 00000000b1496000 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+0x56b/0x800 net/core/net_namespace.c:704
 process_one_work kernel/workqueue.c:3276 [inline]
 process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 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:	08 48 89             	or     %cl,-0x77(%rax)
   3:	df e8                	fucomip %st(0),%st
   5:	6d                   	insl   (%dx),%es:(%rdi)
   6:	38 63 f8             	cmp    %ah,-0x8(%rbx)
   9:	4c 8b 3b             	mov    (%rbx),%r15
   c:	49 39 df             	cmp    %rbx,%r15
   f:	74 69                	je     0x7a
  11:	e8 10 e6 f8 f7       	call   0xf7f8e626
  16:	45 31 e4             	xor    %r12d,%r12d
  19:	e9 8e fe ff ff       	jmp    0xfffffeac
  1e:	e8 03 e6 f8 f7       	call   0xf7f8e626
  23:	48 8d 3d 5c 34 54 06 	lea    0x654345c(%rip),%rdi        # 0x6543486
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	eb c0                	jmp    0xfffffff1
  31:	89 e9                	mov    %ebp,%ecx
  33:	80 e1 07             	and    $0x7,%cl
  36:	80 c1 03             	add    $0x3,%cl
  39:	38 c1                	cmp    %al,%cl
  3b:	0f                   	.byte 0xf
  3c:	8c cd                	mov    %cs,%ebp
  3e:	fe                   	(bad)
  3f:	ff                   	.byte 0xff