------------[ cut here ]------------
conntrack cleanup blocked for 60s
WARNING: net/netfilter/nf_conntrack_core.c:2511 at nf_conntrack_cleanup_net_list+0x154/0x1a0 net/netfilter/nf_conntrack_core.c:2511, CPU#1: kworker/u8:19/5191
Modules linked in:
CPU: 1 UID: 0 PID: 5191 Comm: kworker/u8:19 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: linux,dummy-virt (DT)
Workqueue: netns cleanup_net
pstate: 61402009 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
pc : nf_conntrack_cleanup_net_list+0x154/0x1a0 net/netfilter/nf_conntrack_core.c:2511
lr : nf_conntrack_cleanup_net_list+0x154/0x1a0 net/netfilter/nf_conntrack_core.c:2511
sp : ffff800088c2bbe0
x29: ffff800088c2bbe0 x28: f8f000000b1f8f00 x27: f8f000000b1f8f00
x26: 0000000100012f0a x25: ffff8000829f8000 x24: ffff8000817fe360
x23: 0000000000000001 x22: ffff800088c2bd78 x21: ffff800082a0aaf8
x20: 0000000000000001 x19: ffff800088c2bd50 x18: 00000000ffffffff
x17: 0000000000000000 x16: 0000000000000000 x15: ffff8000831eba00
x14: 0000000000000180 x13: 0000000000000000 x12: ffff800082a010d0
x11: 00000000000000c0 x10: 52fa17b0473f72f8 x9 : d80a09c57160ac67
x8 : f7f000000b307318 x7 : 0000000000000004 x6 : ffff800082a2d530
x5 : 0000000000000002 x4 : fbffff3fffffffff x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000000000000 x0 : f7f000000b306300
Call trace:
 nf_conntrack_cleanup_net_list+0x154/0x1a0 net/netfilter/nf_conntrack_core.c:2511 (P)
 nf_conntrack_pernet_exit+0x90/0xa0 net/netfilter/nf_conntrack_standalone.c:1132
 ops_exit_list net/core/net_namespace.c:205 [inline]
 ops_undo_list+0x10c/0x23c net/core/net_namespace.c:252
 cleanup_net+0x204/0x3f4 net/core/net_namespace.c:696
 process_one_work+0x178/0x2cc kernel/workqueue.c:3257
 process_scheduled_works kernel/workqueue.c:3340 [inline]
 worker_thread+0x24c/0x354 kernel/workqueue.c:3421
 kthread+0x130/0x1fc kernel/kthread.c:463
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860
---[ end trace 0000000000000000 ]---