From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f79.google.com (mail-io1-f79.google.com [209.85.166.79]) (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 C9E402165EA for ; Tue, 28 Oct 2025 03:53:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761623606; cv=none; b=qLggzneSCk0fUxwIB902G57YnDfUTA9DhLb3xnRjdP2D/2eltvRw0ISJNLO4VaYFIa+LT3IJxfSJQ5JpKp5j+FWdQvb+2PYSGn14XcvmEakwlGtoZD6Spc7uvi1aCK3m1mQQv/uQBNvxpSEs48wgi+Zub9WB5tYGTDhdt4725sw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761623606; c=relaxed/simple; bh=BGfKneCMUyS4oSUG29yQM/57sQqS2wDe1Jj2Du9unS4=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=acLDkugAqQ7dt0h+wdo6VpfpLkgymet1y+1oUfw4r6l8ptL1Tov4NtL8X9tT/2QFDSBc7x0oxOlOxofVI79fq4pHcG0jM85aeoWEoWZwA5xQscosCpZFl9dDtjlNx8QXdIFfNbSs7jMI0PBLwvqNHIZGzUMaKKCkJhau5YRxSjk= 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=209.85.166.79 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-io1-f79.google.com with SMTP id ca18e2360f4ac-93e4da7a183so505625239f.1 for ; Mon, 27 Oct 2025 20:53:24 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1761623604; x=1762228404; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=yPF9uA0SkPbYWc15E/dLkMTWGNrtspthe0FjK2GIA/U=; b=QWidjLTDKAzEFSkS9QFonutoRkDALZXC0foV1o8y2QzbtcztAK0edwYJ4Sb/raT8LK p6fbGvCg/iU43AAgFL9B713KD7ywMYwmFcFC57IJK6EIpBf2ZL6yRffi8F8EUuhUfL3E pT4v/v+HAXQ76OLmHMBlYY+bH4Xo1s0sODZTKMCPRCpGI0uPuSaEufyxZgF/ndAppgfF b6kM/jqt9LL7JIkhvcO3yx8jt/FRM8KhxvfP0rjUB+tycmyM8uOTPNGXbWv1Nbg+FxYu 2J3gLhSIusmxJBgALdSsGssfEyxY0eU5tiEf4/LZ9ETb9ljlp2IjhE+AEolHJrC4y8xv qqrg== X-Forwarded-Encrypted: i=1; AJvYcCXJcDIfVbCUa3PaIBEq+68O2HmA/K2q0FB+s6Xt5lDDFEpzhbtkxFt94ruiJzSTBjmTK77xY8+kn8oOLQs=@vger.kernel.org X-Gm-Message-State: AOJu0YxpGq3iF2aQK8DFEg2LnM/YIvV5IwIFTzpYGHpYQRTWJr/g7SoX tJ6cZc59HKvoubEt9hqHWJaV9dYSW+wMmhXWB45sMUKFzaD80jYEjrPEdrq0kiwvj7JC99Ov9iS GH9TXf0uITaHa8PxKNFOUlZDCMq3m1lMhVpUogzCh/zRkGPBAPbm0II763c8= X-Google-Smtp-Source: AGHT+IHOfTBfpyh97DuEFlCqdSRzNFAHSF3NNN9UxyM4rTuGy6a9+beHYa6z39G7USXhLbHXE1LgVyp+Zqbv17OvnSzYtTrwxzuJ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:2486:b0:42d:8b1c:5710 with SMTP id e9e14a558f8ab-4320f5fd34emr34927815ab.0.1761623603945; Mon, 27 Oct 2025 20:53:23 -0700 (PDT) Date: Mon, 27 Oct 2025 20:53:23 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69003e33.050a0220.32483.00e8.GAE@google.com> Subject: [syzbot] [net?] WARNING in tcf_classify From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, jhs@mojatatu.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com, xiyou.wangcong@gmail.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: dcb6fa37fd7b Linux 6.18-rc3 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1415a932580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e46b8a1c645465a9 dashboard link: https://syzkaller.appspot.com/bug?extid=87e1289a044fcd0c5f62 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/512513745f50/disk-dcb6fa37.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d3e1641b051d/vmlinux-dcb6fa37.xz kernel image: https://storage.googleapis.com/syzbot-assets/4fc4d570f537/bzImage-dcb6fa37.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+87e1289a044fcd0c5f62@syzkaller.appspotmail.com RBP: 00007f20739f6090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007f20759e6038 R14: 00007f20759e5fa0 R15: 00007f2075b0fa28 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 31392 at net/sched/cls_api.c:1869 tcf_classify+0xfd7/0x1140 net/sched/cls_api.c:1869 Modules linked in: CPU: 0 UID: 0 PID: 31392 Comm: syz.8.7081 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:tcf_classify+0xfd7/0x1140 net/sched/cls_api.c:1869 Code: e8 03 42 0f b6 04 30 84 c0 0f 85 41 01 00 00 66 41 89 1f eb 05 e8 89 26 75 f8 bb ff ff ff ff e9 04 f9 ff ff e8 7a 26 75 f8 90 <0f> 0b 90 49 83 c5 44 4c 89 eb 49 c1 ed 03 43 0f b6 44 35 00 84 c0 RSP: 0018:ffffc9000b7671f0 EFLAGS: 00010293 RAX: ffffffff894addf6 RBX: 0000000000000002 RCX: ffff888025029e40 RDX: 0000000000000000 RSI: ffffffff8bbf05c0 RDI: ffffffff8bbf0580 RBP: 0000000000000000 R08: 00000000ffffffff R09: 1ffffffff1c0bfd6 R10: dffffc0000000000 R11: fffffbfff1c0bfd7 R12: ffff88805a90de5c R13: ffff88805a90ddc0 R14: dffffc0000000000 R15: ffffc9000b7672c0 FS: 00007f20739f66c0(0000) GS:ffff88812613e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2d2a80 CR3: 0000000024e36000 CR4: 00000000003526f0 Call Trace: multiq_classify net/sched/sch_multiq.c:39 [inline] multiq_enqueue+0xfd/0x4c0 net/sched/sch_multiq.c:66 dev_qdisc_enqueue+0x4e/0x260 net/core/dev.c:4118 __dev_xmit_skb net/core/dev.c:4214 [inline] __dev_queue_xmit+0xe83/0x3b50 net/core/dev.c:4729 packet_snd net/packet/af_packet.c:3076 [inline] packet_sendmsg+0x3e33/0x5080 net/packet/af_packet.c:3108 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 ____sys_sendmsg+0x505/0x830 net/socket.c:2630 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2684 __sys_sendmsg net/socket.c:2716 [inline] __do_sys_sendmsg net/socket.c:2721 [inline] __se_sys_sendmsg net/socket.c:2719 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2719 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f207578efc9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f20739f6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f20759e5fa0 RCX: 00007f207578efc9 RDX: 0000000000000004 RSI: 00002000000000c0 RDI: 0000000000000008 RBP: 00007f20739f6090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007f20759e6038 R14: 00007f20759e5fa0 R15: 00007f2075b0fa28 --- 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