From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f78.google.com (mail-oa1-f78.google.com [209.85.160.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BAC29331218 for ; Sun, 11 Jan 2026 11:35:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768131335; cv=none; b=l1x7/DySzzn5kT9Q2Dl/ydbz6aa2bZtDAgooTFaey+D41kQIPfVBlUQuVtgOg58zZLAXoIPmy5LjkGFG4S3CO0eKtR8ZsD0fd9PvlnYUpqBD4PwaqrSe1gHPnqLWfwxcQvEdM18IYpm0zTsDnC7Gf/5wslyNE+ueeDgYGbzbMxM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768131335; c=relaxed/simple; bh=57BcdOaqkoFKPalZF4kb0yJgHs3b9diZQObKah5jSlc=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=A0qhIIgut92I9w01DqlmMuPmd7kdZ+qdbslsqKLwGStMbiNjob+GZlNjd6RKrx3SaswmqM/mMMLaP6InIWqpDLS4/5YhVk8tRePLKMNKK+L/hrohUFzBLiLKK+sVBn186U2bYJYmt8dARXrsAD7OSZPvzVlitvOkbX6v+t6UjuI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.160.78 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oa1-f78.google.com with SMTP id 586e51a60fabf-3fda5f60035so9498267fac.0 for ; Sun, 11 Jan 2026 03:35:33 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1768131332; x=1768736132; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=e6/jbbz9zla6XH3ASE7oZUGg6+DGatjynlVS29Ut1C4=; b=RrXFSbP3LEQLund7CjxPnyiuNvlmbFt95j+cMybp4QbwfLMzt9v4zRgVpvxtHCCMq0 Ly3osQz7lyXv5JN1AkhmVjhCcZ30Kk5wjJeQ1OEUUk7F64pnbytFy5yXWup5B0i4ImqU qOR5ob2H0HXVrJrMCxZWvbsMD2161LP2+pJ3wQ+KSGtju7qOZqbPJjUt9eLTIyMF8L6y iTS7gckVwo72hsNSGyrE+zfwhL8yYJB1gKWSqZSjWsn1JJv7sWPukk2JdU39EBUhM8fQ zEK3pyHNsgicKGxe2CUjCGQLxJs3A+m1rdmcq9waS0pl4qouxtoTeBphWUW1QtrdTYdu zM/g== X-Forwarded-Encrypted: i=1; AJvYcCUtkbKu/lySpQNSRSai0shiQMzKQxeV1bqZwGgZFe/Z2icVfcyAg5EfNCfyOkWwdxOOrSsgcUA=@vger.kernel.org X-Gm-Message-State: AOJu0YwsfUeIzRKNF5lWU/Yi4yxSLCzB9QG71BMbyVAd2/XaVMFywDqX mwLPrgAxoQ69lykUOHUbGM+dQNSBZ2PusK2jg9ee/utwusO1XrzF0iA0WwLXu3MRWMBMTP6YUjh ZSm54TDxB2SoGUnE9i7u8/eBlctExSUHwI38gpHPbzIom+nreT6u24K1WE7o= X-Google-Smtp-Source: AGHT+IF5i7Jc2Pa1QYeaKVHMr6CPYtn8COJ+T1hzZC+wx4RdujTrnmDfLa5f3mA+Im/hXS8NEru2miJEsnZGT4S9Wm9P0AxBkoiA Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:780e:b0:659:9a49:8e66 with SMTP id 006d021491bc7-65f54f5abefmr5235655eaf.54.1768131332560; Sun, 11 Jan 2026 03:35:32 -0800 (PST) Date: Sun, 11 Jan 2026 03:35:32 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69638b04.050a0220.eaf7.0063.GAE@google.com> Subject: [syzbot] [bridge?] [netfilter?] WARNING in br_nf_local_in (2) From: syzbot To: bridge@lists.linux.dev, coreteam@netfilter.org, davem@davemloft.net, edumazet@google.com, fw@strlen.de, horms@kernel.org, idosch@nvidia.com, kadlec@netfilter.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, pabeni@redhat.com, pablo@netfilter.org, phil@nwl.cc, razor@blackwall.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: f417b7ffcbef Add linux-next specific files for 20260109 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=12f625fa580000 kernel config: https://syzkaller.appspot.com/x/.config?x=63a1fc1b4011ac76 dashboard link: https://syzkaller.appspot.com/bug?extid=9c5dd93a81a3f39325c2 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/1f048080a918/disk-f417b7ff.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/dfd5ea190c96/vmlinux-f417b7ff.xz kernel image: https://storage.googleapis.com/syzbot-assets/db24c176e0df/bzImage-f417b7ff.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9c5dd93a81a3f39325c2@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: net/bridge/br_netfilter_hooks.c:602 at br_nf_local_in+0x40e/0x470 net/bridge/br_netfilter_hooks.c:602, CPU#1: ksoftirqd/1/23 Modules linked in: CPU: 1 UID: 0 PID: 23 Comm: ksoftirqd/1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:br_nf_local_in+0x40e/0x470 net/bridge/br_netfilter_hooks.c:602 Code: 38 69 eb f7 e9 4b fc ff ff 44 89 e1 80 e1 07 38 c1 0f 8c a8 fc ff ff 4c 89 e7 e8 1d 69 eb f7 e9 9b fc ff ff e8 d3 98 84 f7 90 <0f> 0b 90 48 89 df e8 b7 2b 00 00 e9 5b fd ff ff e8 bd 98 84 f7 90 RSP: 0000:ffffc900001d6f38 EFLAGS: 00010246 RAX: ffffffff8a3c21ed RBX: ffff8880792ba140 RCX: ffff88801d6ddac0 RDX: 0000000000000100 RSI: 0000000000000002 RDI: 0000000000000001 RBP: 0000000000000002 R08: ffff88807903e183 R09: 1ffff1100f207c30 R10: dffffc0000000000 R11: ffffed100f207c31 R12: 0000000000000000 R13: ffff8880792ba1a8 R14: 1ffff1100f257435 R15: ffff88807903e180 FS: 0000000000000000(0000) GS:ffff888125d07000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa503fb1000 CR3: 0000000078d26000 CR4: 00000000003526f0 Call Trace: nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_slow+0xc5/0x220 net/netfilter/core.c:623 nf_hook include/linux/netfilter.h:273 [inline] NF_HOOK+0x251/0x390 include/linux/netfilter.h:316 br_handle_frame_finish+0x15c6/0x1c90 net/bridge/br_input.c:235 br_nf_hook_thresh net/bridge/br_netfilter_hooks.c:-1 [inline] br_nf_pre_routing_finish+0x1364/0x1af0 net/bridge/br_netfilter_hooks.c:425 NF_HOOK+0x61b/0x6b0 include/linux/netfilter.h:318 br_nf_pre_routing+0xeb7/0x1470 net/bridge/br_netfilter_hooks.c:534 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_bridge_pre net/bridge/br_input.c:291 [inline] br_handle_frame+0x96e/0x14f0 net/bridge/br_input.c:442 __netif_receive_skb_core+0x95f/0x2f90 net/core/dev.c:6026 __netif_receive_skb_one_core net/core/dev.c:6137 [inline] __netif_receive_skb+0x72/0x380 net/core/dev.c:6252 process_backlog+0x54f/0x1340 net/core/dev.c:6604 __napi_poll+0xae/0x320 net/core/dev.c:7668 napi_poll net/core/dev.c:7731 [inline] net_rx_action+0x64a/0xe00 net/core/dev.c:7883 handle_softirqs+0x22b/0x7c0 kernel/softirq.c:626 run_ksoftirqd+0x36/0x60 kernel/softirq.c:1067 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160 kthread+0x389/0x480 kernel/kthread.c:467 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup