[   43.808354][    T9] ------------[ cut here ]------------
[   43.815596][    T9] hook not found, pf 3 num 0
[   43.815708][    T9] WARNING: CPU: 1 PID: 9 at net/netfilter/core.c:480 __nf_unregister_net_hook+0x17a/0x560
[   43.831894][    T9] Modules linked in:
[   43.835817][    T9] CPU: 1 PID: 9 Comm: kworker/u4:0 Not tainted 5.12.0-rc7-syzkaller #0
[   43.847441][ T8379] syz-executor.0 (8379) used greatest stack depth: 22488 bytes left
[   43.849144][    T9] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   43.866660][    T9] Workqueue: netns cleanup_net
[   43.871866][    T9] RIP: 0010:__nf_unregister_net_hook+0x17a/0x560
[   43.878464][    T9] 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 fe 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
[   43.900250][    T9] RSP: 0018:ffffc90000ce7bf0 EFLAGS: 00010282
[   43.906741][    T9] RAX: 0000000000000000 RBX: ffff888021d17500 RCX: 0000000000000000
[   43.914854][    T9] RDX: 0000000000000001 RSI: 0000000000000004 RDI: fffff5200019cf70
[   43.923730][    T9] RBP: 0000000000000001 R08: 0000000000000001 R09: ffff8880ba11fa1b
[   43.933433][    T9] R10: ffffed1017423f43 R11: 0000000000000001 R12: 0000000000000003
[   43.941955][    T9] R13: ffff88802d790000 R14: ffff888021d1751c R15: ffff88802d790f60
[   43.950057][    T9] FS:  0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
[   43.959462][    T9] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   43.966379][    T9] CR2: 00007f351c4a56c0 CR3: 000000001ce92000 CR4: 00000000001506f0
[   43.974934][    T9] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   43.983323][    T9] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   43.991425][    T9] Call Trace:
[   43.994711][    T9]  nf_unregister_net_hooks+0xb1/0xf0
[   44.000087][    T9]  cleanup_net+0x3a4/0x990
[   44.004590][    T9]  ? ops_free_list.part.0+0x2d0/0x2d0
[   44.010144][    T9]  process_one_work+0x84c/0x13b0
[   44.015451][    T9]  ? lock_release+0x720/0x720
[   44.020252][    T9]  ? pwq_dec_nr_in_flight+0x2b0/0x2b0
[   44.026229][    T9]  ? rwlock_bug.part.0+0x90/0x90
[   44.032136][    T9]  ? _raw_spin_lock_irq+0x41/0x50
[   44.037511][    T9]  worker_thread+0x598/0xf80
[   44.042363][    T9]  ? process_one_work+0x13b0/0x13b0
[   44.047685][    T9]  kthread+0x36f/0x450
[   44.051830][    T9]  ? _raw_spin_unlock_irq+0x1f/0x40
[   44.057037][    T9]  ? __kthread_bind_mask+0x90/0x90
[   44.062233][    T9]  ret_from_fork+0x1f/0x30
[   44.066744][    T9] Kernel panic - not syncing: panic_on_warn set ...
[   44.073670][    T9] CPU: 0 PID: 9 Comm: kworker/u4:0 Not tainted 5.12.0-rc7-syzkaller #0
[   44.081900][    T9] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   44.092207][    T9] Workqueue: netns cleanup_net
[   44.097075][    T9] Call Trace:
[   44.100436][    T9]  dump_stack+0xa5/0xe6
[   44.104894][    T9]  panic+0x256/0x4eb
[   44.108896][    T9]  ? __warn_printk+0xee/0xee
[   44.113470][    T9]  ? __nf_unregister_net_hook+0x17a/0x560
[   44.119184][    T9]  __warn.cold+0x2b/0x35
[   44.123515][    T9]  ? __nf_unregister_net_hook+0x17a/0x560
[   44.129225][    T9]  report_bug+0x15a/0x1b0
[   44.133555][    T9]  handle_bug+0x3c/0x60
[   44.137690][    T9]  exc_invalid_op+0x14/0x40
[   44.142334][    T9]  asm_exc_invalid_op+0x12/0x20
[   44.147340][    T9] RIP: 0010:__nf_unregister_net_hook+0x17a/0x560
[   44.154513][    T9] 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 fe 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
[   44.174305][    T9] RSP: 0018:ffffc90000ce7bf0 EFLAGS: 00010282
[   44.180673][    T9] RAX: 0000000000000000 RBX: ffff888021d17500 RCX: 0000000000000000
[   44.188983][    T9] RDX: 0000000000000001 RSI: 0000000000000004 RDI: fffff5200019cf70
[   44.197139][    T9] RBP: 0000000000000001 R08: 0000000000000001 R09: ffff8880ba11fa1b
[   44.205122][    T9] R10: ffffed1017423f43 R11: 0000000000000001 R12: 0000000000000003
[   44.213085][    T9] R13: ffff88802d790000 R14: ffff888021d1751c R15: ffff88802d790f60
[   44.221200][    T9]  nf_unregister_net_hooks+0xb1/0xf0
[   44.226760][    T9]  cleanup_net+0x3a4/0x990
[   44.231156][    T9]  ? ops_free_list.part.0+0x2d0/0x2d0
[   44.236597][    T9]  process_one_work+0x84c/0x13b0
[   44.241817][    T9]  ? lock_release+0x720/0x720
[   44.246490][    T9]  ? pwq_dec_nr_in_flight+0x2b0/0x2b0
[   44.251839][    T9]  ? rwlock_bug.part.0+0x90/0x90
[   44.256853][    T9]  ? _raw_spin_lock_irq+0x41/0x50
[   44.261943][    T9]  worker_thread+0x598/0xf80
[   44.266539][    T9]  ? process_one_work+0x13b0/0x13b0
[   44.271715][    T9]  kthread+0x36f/0x450
[   44.275760][    T9]  ? _raw_spin_unlock_irq+0x1f/0x40
[   44.281048][    T9]  ? __kthread_bind_mask+0x90/0x90
[   44.286143][    T9]  ret_from_fork+0x1f/0x30
[   44.292461][    T9] Kernel Offset: disabled
[   44.296926][    T9] Rebooting in 86400 seconds..