[   45.599533][  T177] ------------[ cut here ]------------
[   45.606796][  T177] hook not found, pf 3 num 0
[   45.606908][  T177] WARNING: CPU: 1 PID: 177 at net/netfilter/core.c:480 __nf_unregister_net_hook+0x17a/0x560
[   45.624987][  T177] Modules linked in:
[   45.629001][  T177] CPU: 1 PID: 177 Comm: kworker/u4:4 Not tainted 5.12.0-rc7-syzkaller #0
[   45.638805][  T177] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   45.653762][  T177] Workqueue: netns cleanup_net
[   45.659681][  T177] RIP: 0010:__nf_unregister_net_hook+0x17a/0x560
[   45.667081][  T177] Code: 89 f0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 a7 03 00 00 8b 53 1c 44 89 e6 48 c7 c7 20 bc 9e 89 4c 89 04 24 e8 6e 3a 62 01 <0f> 0b 4c 8b 04 24 e9 ba 00 00 00 48 89 ea 48 c1 e2 04 49 8d 7c 10
[   45.687869][  T177] RSP: 0018:ffffc90000fafbf0 EFLAGS: 00010282
[   45.695300][  T177] RAX: 0000000000000000 RBX: ffff88802242c400 RCX: 0000000000000000
[   45.704120][  T177] RDX: 0000000000000001 RSI: 0000000000000004 RDI: fffff520001f5f70
[   45.712348][  T177] RBP: 0000000000000001 R08: 0000000000000001 R09: ffff8880ba11fa1b
[   45.720800][  T177] R10: ffffed1017423f43 R11: 0000000000000001 R12: 0000000000000003
[   45.729067][  T177] R13: ffff888016278000 R14: ffff88802242c41c R15: ffff888016278f60
[   45.738716][  T177] FS:  0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
[   45.749087][  T177] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   45.756177][  T177] CR2: 00007fb7eacf3000 CR3: 000000000febd000 CR4: 00000000001506e0
[   45.765215][  T177] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   45.775121][  T177] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   45.783787][  T177] Call Trace:
[   45.787551][  T177]  nf_unregister_net_hooks+0xb1/0xf0
[   45.793422][  T177]  cleanup_net+0x3a4/0x990
[   45.797862][  T177]  ? ops_free_list.part.0+0x2d0/0x2d0
[   45.804552][  T177]  process_one_work+0x84c/0x13b0
[   45.809784][  T177]  ? lock_release+0x720/0x720
[   45.814730][  T177]  ? pwq_dec_nr_in_flight+0x2b0/0x2b0
[   45.820606][  T177]  ? rwlock_bug.part.0+0x90/0x90
[   45.825852][  T177]  ? _raw_spin_lock_irq+0x41/0x50
[   45.831953][  T177]  worker_thread+0x598/0xf80
[   45.836567][  T177]  ? process_one_work+0x13b0/0x13b0
[   45.843003][  T177]  kthread+0x36f/0x450
[   45.847437][  T177]  ? _raw_spin_unlock_irq+0x1f/0x40
[   45.855435][  T177]  ? __kthread_bind_mask+0x90/0x90
[   45.862650][  T177]  ret_from_fork+0x1f/0x30
[   45.867099][  T177] Kernel panic - not syncing: panic_on_warn set ...
[   45.873859][  T177] CPU: 1 PID: 177 Comm: kworker/u4:4 Not tainted 5.12.0-rc7-syzkaller #0
[   45.882530][  T177] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   45.893293][  T177] Workqueue: netns cleanup_net
[   45.898437][  T177] Call Trace:
[   45.901976][  T177]  dump_stack+0xa5/0xe6
[   45.906313][  T177]  panic+0x256/0x4eb
[   45.910445][  T177]  ? __warn_printk+0xee/0xee
[   45.915520][  T177]  ? __nf_unregister_net_hook+0x17a/0x560
[   45.921614][  T177]  __warn.cold+0x2b/0x35
[   45.925892][  T177]  ? __nf_unregister_net_hook+0x17a/0x560
[   45.931769][  T177]  report_bug+0x15a/0x1b0
[   45.936116][  T177]  handle_bug+0x3c/0x60
[   45.940800][  T177]  exc_invalid_op+0x14/0x40
[   45.945400][  T177]  asm_exc_invalid_op+0x12/0x20
[   45.950798][  T177] RIP: 0010:__nf_unregister_net_hook+0x17a/0x560
[   45.957290][  T177] Code: 89 f0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 a7 03 00 00 8b 53 1c 44 89 e6 48 c7 c7 20 bc 9e 89 4c 89 04 24 e8 6e 3a 62 01 <0f> 0b 4c 8b 04 24 e9 ba 00 00 00 48 89 ea 48 c1 e2 04 49 8d 7c 10
[   45.981032][  T177] RSP: 0018:ffffc90000fafbf0 EFLAGS: 00010282
[   45.987128][  T177] RAX: 0000000000000000 RBX: ffff88802242c400 RCX: 0000000000000000
[   45.995109][  T177] RDX: 0000000000000001 RSI: 0000000000000004 RDI: fffff520001f5f70
[   46.003227][  T177] RBP: 0000000000000001 R08: 0000000000000001 R09: ffff8880ba11fa1b
[   46.011304][  T177] R10: ffffed1017423f43 R11: 0000000000000001 R12: 0000000000000003
[   46.019663][  T177] R13: ffff888016278000 R14: ffff88802242c41c R15: ffff888016278f60
[   46.028363][  T177]  nf_unregister_net_hooks+0xb1/0xf0
[   46.033901][  T177]  cleanup_net+0x3a4/0x990
[   46.038299][  T177]  ? ops_free_list.part.0+0x2d0/0x2d0
[   46.043673][  T177]  process_one_work+0x84c/0x13b0
[   46.048744][  T177]  ? lock_release+0x720/0x720
[   46.053699][  T177]  ? pwq_dec_nr_in_flight+0x2b0/0x2b0
[   46.059065][  T177]  ? rwlock_bug.part.0+0x90/0x90
[   46.064106][  T177]  ? _raw_spin_lock_irq+0x41/0x50
[   46.069493][  T177]  worker_thread+0x598/0xf80
[   46.074299][  T177]  ? process_one_work+0x13b0/0x13b0
[   46.079672][  T177]  kthread+0x36f/0x450
[   46.084067][  T177]  ? _raw_spin_unlock_irq+0x1f/0x40
[   46.089350][  T177]  ? __kthread_bind_mask+0x90/0x90
[   46.096271][  T177]  ret_from_fork+0x1f/0x30
[   46.100890][  T177] Kernel Offset: disabled
[   46.105424][  T177] Rebooting in 86400 seconds..