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Fri, 31 Oct 2025 04:31:02 -0700 (PDT) Date: Fri, 31 Oct 2025 04:31:02 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69049df6.050a0220.e9cb8.000c.GAE@google.com> Subject: Re: [syzbot] [netfilter?] WARNING in __nf_unregister_net_hook (9) From: syzbot To: linux-kernel@vger.kernel.org, phil@nwl.cc, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING in nf_hook_entry_head ------------[ cut here ]------------ WARNING: CPU: 0 PID: 36 at net/netfilter/core.c:329 nf_hook_entry_head+0x23e/0x2c0 net/netfilter/core.c:329 Modules linked in: CPU: 0 UID: 0 PID: 36 Comm: kworker/u8:2 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 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 7d b9 b6 f8 4d 39 37 74 36 e8 53 04 51 f8 90 <0f> 0b 90 31 db 48 89 d8 5b 41 5e 41 5f 5d c3 cc cc cc cc cc e8 39 RSP: 0018:ffffc90000ac7768 EFLAGS: 00010293 RAX: ffffffff896eff5b RBX: ffff888030a98000 RCX: ffff8881416b9e40 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff8881416b9e40 R09: 0000000000000006 R10: 000000000000000a R11: 0000000000000000 R12: ffff888020ec8000 R13: 0000000000000005 R14: ffff888020ec8000 R15: ffff888030a98108 FS: 0000000000000000(0000) GS:ffff88812613e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2e4b7156c0 CR3: 000000000dd38000 CR4: 00000000003526f0 Call Trace: __nf_unregister_net_hook+0x74/0x700 net/netfilter/core.c:491 nft_unregister_flowtable_ops net/netfilter/nf_tables_api.c:8977 [inline] __nft_unregister_flowtable_net_hooks net/netfilter/nf_tables_api.c:8992 [inline] __nft_release_hook+0x180/0x350 net/netfilter/nf_tables_api.c:11985 __nft_release_hooks net/netfilter/nf_tables_api.c:11999 [inline] nf_tables_pre_exit_net+0xa7/0x110 net/netfilter/nf_tables_api.c:12150 ops_pre_exit_list net/core/net_namespace.c:161 [inline] ops_undo_list+0x187/0x990 net/core/net_namespace.c:234 cleanup_net+0x4d8/0x820 net/core/net_namespace.c:696 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Tested on: commit: 0d0eb186 cxgb4: flower: add support for fragmentation git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=162a7fe2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=5683686a5f7ee53f dashboard link: https://syzkaller.appspot.com/bug?extid=78ac1e46d2966eb70fda compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Note: no patches were applied.