[syzbot] [netfilter?] WARNING in nf_hook_entry_head (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: b69053dd3ffb wifi: mt76: Remove blank line after mt792x fi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=134dca9a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a94030c847137a18
dashboard link: https://syzkaller.appspot.com/bug?extid=6f6a1d20567a8d6b2a58
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/18036fd3b399/disk-b69053dd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/bcf4c5ec9d8e/vmlinux-b69053dd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b4101a9d1eed/bzImage-b69053dd.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6f6a1d...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: net/netfilter/core.c:329 at nf_hook_entry_head+0x23e/0x2c0 net/netfilter/core.c:329, CPU#0: kworker/u8:13/4537
Modules linked in:
CPU: 0 UID: 0 PID: 4537 Comm: kworker/u8:13 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: netns cleanup_net
RIP: 0010:nf_hook_entry_head+0x23e/0x2c0 net/netfilter/core.c:329
Code: 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 ff e8 5d 76 a7 f8 4d 39 37 74 36 e8 23 56 41 f8 90 <0f> 0b 90 31 db 48 89 d8 5b 41 5e 41 5f 5d e9 5a 9f 90 f7 cc e8 09
RSP: 0018:ffffc9000d997788 EFLAGS: 00010293
RAX: ffffffff897fa15b RBX: ffff888024f18000 RCX: ffff888033515b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff888033515b80 R09: 0000000000000006
R10: 000000000000000a R11: 0000000000000000 R12: ffff8880555f8000
R13: 0000000000000005 R14: ffff8880555f8000 R15: ffff888024f18108
FS: 0000000000000000(0000) GS:ffff888125e1f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fa18ff8 CR3: 00000000ac7e4000 CR4: 0000000000350ef0
Call Trace:
<TASK>
__nf_unregister_net_hook+0x74/0x6f0 net/netfilter/core.c:491
nft_unregister_flowtable_ops net/netfilter/nf_tables_api.c:9038 [inline]
__nft_unregister_flowtable_net_hooks net/netfilter/nf_tables_api.c:9053 [inline]
__nft_release_hook+0x180/0x350 net/netfilter/nf_tables_api.c:12035
__nft_release_hooks net/netfilter/nf_tables_api.c:12049 [inline]
nf_tables_pre_exit_net+0xa7/0x110 net/netfilter/nf_tables_api.c:12200
ops_pre_exit_list net/core/net_namespace.c:161 [inline]
ops_undo_list+0x187/0x990 net/core/net_namespace.c:234
cleanup_net+0x4d8/0x7a0 net/core/net_namespace.c:696
process_one_work kernel/workqueue.c:3257 [inline]
process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
</TASK>


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