------------[ cut here ]------------
conntrack cleanup blocked for 60s
WARNING: net/netfilter/nf_conntrack_core.c:2512 at nf_conntrack_cleanup_net_list+0x234/0x340, CPU#0: kworker/u8:4/28236
Modules linked in:
CPU: 0 UID: 0 PID: 28236 Comm: kworker/u8:4 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: netns cleanup_net
RIP: 0010:nf_conntrack_cleanup_net_list+0x234/0x340
Code: 08 48 89 df e8 ed 9d 66 f8 4c 8b 3b 49 39 df 74 69 e8 80 7a fc f7 45 31 e4 e9 8e fe ff ff e8 73 7a fc f7 48 8d 3d 6c 8d 57 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:ffffc900099978d0 EFLAGS: 00010293
RAX: ffffffff89c9121d RBX: ffffc90009997a70 RCX: ffff888171015700
RDX: 0000000000000000 RSI: fffffffffffffffe RDI: ffffffff90209f90
RBP: 0000000000000001 R08: ffff88811e494c03 R09: 1ffff11023c92980
R10: dffffc0000000000 R11: ffffed1023c92981 R12: 0000000000000001
R13: dffffc0000000000 R14: 0000000100049e74 R15: 0000000100049e76
FS:  0000000000000000(0000) GS:ffff88818de66000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f265514da08 CR3: 0000000114760000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 ops_undo_list+0x52b/0x940
 cleanup_net+0x56b/0x800
 process_scheduled_works+0xb02/0x1830
 worker_thread+0xa50/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
