From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f71.google.com (mail-oo1-f71.google.com [209.85.161.71]) (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 91D6528D850 for ; Tue, 10 Feb 2026 03:36:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.71 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770694589; cv=none; b=PRWp9VhGMuI5Zewb+r6ETf3tB+IWvIpTHbyyZZLwt+MYoe/OU1wTfvoUf+5K/79WU5X7jtiqyI0lmcsCg3Rk6+Z5ASraWfoUj+sbifv0RKjTcvJRwrF20UCtWpaOyBJhrcN5AUgasLvQ2ybmX1qkaDSWMJp+f2xPDUWEjswHFI4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770694589; c=relaxed/simple; bh=n4Ix1TM0ZNgNrlgLXeHzo9bC/QstomgUPsY+9oTMg4w=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=gHzZyTjHq5FggRIUH1RvKovTLi0XZdsGztezYUCSr/N/6LoOSbWI8qxcmiDFBSiRAB5vssUzDSkF5ooUpt4cb5u6EOFDbapf0+wLd2F7CLnvlWZisfecwub/pQxZb0vDr2ak7xQ4DLDAOG7rxZESPu2UDVesrVTcBDOo6upGgbc= 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=209.85.161.71 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-oo1-f71.google.com with SMTP id 006d021491bc7-66b47c7a795so13534744eaf.2 for ; Mon, 09 Feb 2026 19:36:28 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770694587; x=1771299387; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=Kv6zYoNwOXJgrs/PCSsWLPPE13Dl39IaBgyYn8cysGs=; b=c3xZhmeM94nl5W5Z27cbom/KUYB4tbl0X9v7HeAV0O9RaxJBCkfYaFt3G3mlh24QNG HQQCzBveKUqGF884RTvZjhGn5AWe7M+k+xIySTA2/OkPNnJAbGG+8fiWET7TnWFr0mLS Cgdbw5vlcHlotSfxtATOB80pqQeNc+F1ARCpq2GH0Fs+Sif52WkBqR1on152JejiL0JI o9oLxp35udgHbbZdAiGDVeWbOksPuoVcDEeiF3pxA9LRDeSz0w9aancaxmzjME9V3XhX tVxLHfocbDKIjEfne4REVfDHjYftqDA0yRWrnFdot3jllyk00rxMcbcxt+iG2p7yDs2/ brjQ== X-Forwarded-Encrypted: i=1; AJvYcCWChGB+vHUiPxpofjNNgX/iGY96XjLP1EdHZKHfJp/mExrYknwpeFyxPsiCGMCIvTUbcwpbaKY=@vger.kernel.org X-Gm-Message-State: AOJu0Yy89rlnhHVyxdy+3pzJpaJ9WLM/O4XfO7rTyud1xvkMoTQaz6Be OqXDGmtQoN466HdfkzfcN/pr6pM3XjlDIcsfqlRCi/5OL5nlIDehP5OcjQGHtOUZIG+zSTW8Hja +gXvl1MjnoIuOimkp5gUJS45m6BIQtRKp6gDVcpY+5f0rEhkSoNlX9JDlvS0= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1612:b0:672:605f:db65 with SMTP id 006d021491bc7-672ff74369bmr319269eaf.81.1770694587659; Mon, 09 Feb 2026 19:36:27 -0800 (PST) Date: Mon, 09 Feb 2026 19:36:27 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <698aa7bb.050a0220.3b3015.0086.GAE@google.com> Subject: [syzbot] [bridge?] WARNING in br_multicast_del_pg From: syzbot To: bridge@lists.linux.dev, davem@davemloft.net, edumazet@google.com, horms@kernel.org, idosch@nvidia.com, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, razor@blackwall.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: c89477ad7944 inet: RAW sockets using IPPROTO_RAW MUST drop.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=15f73a5a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e3161cabe5a361ff dashboard link: https://syzkaller.appspot.com/bug?extid=d5d1b7343531d17bd3c5 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/277c818ebac6/disk-c89477ad.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d4e6f0388a87/vmlinux-c89477ad.xz kernel image: https://storage.googleapis.com/syzbot-assets/14eabb9cbd91/bzImage-c89477ad.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d5d1b7343531d17bd3c5@syzkaller.appspotmail.com ------------[ cut here ]------------ n == 0 WARNING: net/bridge/br_multicast.c:718 at br_multicast_port_ngroups_dec_one net/bridge/br_multicast.c:718 [inline], CPU#0: syz.4.4607/22043 WARNING: net/bridge/br_multicast.c:718 at br_multicast_port_ngroups_dec net/bridge/br_multicast.c:771 [inline], CPU#0: syz.4.4607/22043 WARNING: net/bridge/br_multicast.c:718 at br_multicast_del_pg+0x1bbe/0x1e20 net/bridge/br_multicast.c:825, CPU#0: syz.4.4607/22043 Modules linked in: CPU: 0 UID: 0 PID: 22043 Comm: syz.4.4607 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:br_multicast_port_ngroups_dec_one net/bridge/br_multicast.c:718 [inline] RIP: 0010:br_multicast_port_ngroups_dec net/bridge/br_multicast.c:771 [inline] RIP: 0010:br_multicast_del_pg+0x1bbe/0x1e20 net/bridge/br_multicast.c:825 Code: 41 5f 5d e9 04 7a 48 f7 e8 3f 73 5c f7 90 0f 0b 90 e9 cf fd ff ff e8 31 73 5c f7 90 0f 0b 90 e9 16 fd ff ff e8 23 73 5c f7 90 <0f> 0b 90 e9 60 fd ff ff e8 15 73 5c f7 eb 05 e8 0e 73 5c f7 48 8b RSP: 0018:ffffc9000c207220 EFLAGS: 00010293 RAX: ffffffff8a68042d RBX: ffff88807c6f1800 RCX: ffff888066e90000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff888066e90000 R09: 000000000000000c R10: 000000000000000c R11: 0000000000000000 R12: ffff8880303ef800 R13: dffffc0000000000 R14: ffff888050eb11c4 R15: 1ffff1100a1d6238 FS: 00007fa45921b6c0(0000) GS:ffff8881256f5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa4591f9ff8 CR3: 0000000081df2000 CR4: 00000000003526f0 Call Trace: br_mdb_flush_pgs net/bridge/br_mdb.c:1525 [inline] br_mdb_flush net/bridge/br_mdb.c:1544 [inline] br_mdb_del_bulk+0x5e2/0xb20 net/bridge/br_mdb.c:1561 rtnl_mdb_del+0x48a/0x640 net/core/rtnetlink.c:-1 rtnetlink_rcv_msg+0x77e/0xbe0 net/core/rtnetlink.c:6967 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xa68/0xad0 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa45839aeb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa45921b028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fa458615fa0 RCX: 00007fa45839aeb9 RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000000000000004 RBP: 00007fa458408c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa458616038 R14: 00007fa458615fa0 R15: 00007fff0b59fae8 --- 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