From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f80.google.com (mail-oo1-f80.google.com [209.85.161.80]) (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 9C4044746DD for ; Fri, 11 Sep 2026 11:45:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.80 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789127126; cv=none; b=oE9CFba3dM19pR0FcT2F+3cvQFV4aN7AgizrQ98EHxsjPrYmPiYA3Ycp5BCD104MrBVsXatrMkYSA9F+kR3tHfkksA+DgU72tyeLJ+/4hUQP16NMdKHqrW8D8dBhfIUbGHxhueC7l0Y36/PAE9ZvbSJq0yn/sHeeS/9JEA1tdeA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789127126; c=relaxed/simple; bh=XhJtIOc3u2hLLNzWnkH5OWfmH7YYPxIQ2OCmKVrFqrM=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=OoONCXMDtVqC4CfpC7K3Jd+KqnX2JUe18OuA98kEVRuj8+slHbTpeQo2Nfnv8RcuwtG6qWU/+3EQjiRheYR1SJaC0i2n2pPqmBAQS1K1I1B8dCHnbpOWd8XaubMNN7LeysQocY8hQuTJIm2ImBSBvHoEEqArVteuYZCtQXyVPeE= 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=209.85.161.80 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-f80.google.com with SMTP id 006d021491bc7-6beffd68e4bso1898623eaf.0 for ; Fri, 11 Sep 2026 04:45:24 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1789127123; x=1789731923; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=DixrXJooAk+5iJDF/dnwtd5cfPxBUrdvO4OX36Wx9tA=; b=lwqAZ08HS29fuxUbCKEreDClWiXOotPPPykdw4j0G+Dd9+b+yi16uQ60fuGAeQ8vRS LID1jZhuVV2T1OmHXSw1Oi9Sr97Kjuy8T23QvszFBhXw/JJdFCQCzBPDMPwgxdiiQOHV 3lPYwpjwRJmN/IH5EibtJL5bCVo3jbBcc1G3pO67nfz1DzpHUewLQJK3nowIhQCDnK8Y 5EZB4WgssZpJlKASNh0GUWT9kzCRqW1o6ZoiBzKxTc8VCAIFPtuCFKVyxJJBrFAMey+c //aQoNMRc1Hdp33TIHvIa82rPe8IW1rAYuwvoK54IMzas371aLK5jCRwPilgRQzPy667 nmCg== X-Forwarded-Encrypted: i=1; AKwUvBwlakZbbztV1dmER/1ugJJSZnBP7/ibYZjZYyCQxfnlKU49c3+vrn5HqtBArBfo8uOaBkFxGTuKYsFT69A=@vger.kernel.org X-Gm-Message-State: AFuF++nLzyeuP3KEgCxHkva5knS5lXHbO5PP6IqwHD89h2csGI2uWO8l lbgAgCJ/0rVYIpYabOuR5M59nOhxGfR2aa9lusLvaEXDxYxUTAj7mlAxpWMh5jh5D27tbmvnjrk AhruwNQv4UsaVghQaAl+2SikXBUdZsffCcYSGk7HGIJHMa8EdfFG6a1+UiJc= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1889:b0:6b5:ec2f:356f with SMTP id 006d021491bc7-6bf46bb2c16mr4634956eaf.32.1789127123419; Fri, 11 Sep 2026 04:45:23 -0700 (PDT) Date: Fri, 11 Sep 2026 04:45:23 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aa3e9d3.f2639fcc.29487d.0028.GAE@google.com> Subject: [syzbot] [net?] kernel BUG in net_dm_packet_work (2) From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, nhorman@tuxdriver.com, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 08df884136f1 Merge tag 'thermal-7.3-rc3' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14cd4925580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8c5c3949d762a91f dashboard link: https://syzkaller.appspot.com/bug?extid=586af68eb819833c2d91 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-08df8841.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/21cf9eeaddab/vmlinux-08df8841.xz kernel image: https://storage.googleapis.com/syzbot-assets/a041f1e01a69/bzImage-08df8841.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+586af68eb819833c2d91@syzkaller.appspotmail.com skb frag: 00000100: 44 d2 0a a2 e2 47 a7 df 6f 97 84 d1 f7 fb c3 2a skb frag: 00000110: 21 54 9f 61 2b aa b4 19 63 72 89 80 f0 62 f3 61 skb frag: 00000120: 9f 89 a0 49 03 f5 e7 66 b6 4b 34 44 cd b9 03 b5 ------------[ cut here ]------------ kernel BUG at ./include/linux/skbuff.h:2847! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 1 UID: 0 PID: 5877 Comm: kworker/1:7 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: events net_dm_packet_work RIP: 0010:__skb_pull include/linux/skbuff.h:2847 [inline] RIP: 0010:skb_pull_inline include/linux/skbuff.h:2854 [inline] RIP: 0010:skb_pull.cold+0x29/0x2b net/core/skbuff.c:2677 Code: 0b e8 6b b3 9c 00 44 89 65 70 89 de 48 c7 c7 60 cc 38 8d e8 b9 e6 b2 ff 31 d2 48 89 ee 48 c7 c7 a0 cc 38 8d e8 e8 30 26 08 90 <0f> 0b e8 40 b3 9c 00 4c 89 e2 be 01 00 00 00 48 c7 c7 00 ff ca 90 RSP: 0018:ffffc900044df9f0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 00000000000000ea RCX: 0000000000000000 RDX: ffff88802461a580 RSI: ffffffff816f5ede RDI: ffff88802461a580 RBP: ffff88802c76ca00 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000001b38 R13: 0000000000001a4e R14: 0000000000001b38 R15: ffff88802c76ca00 FS: 0000000000000000(0000) GS:ffff8880d5c5c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa64e227dac CR3: 00000000647d3000 CR4: 0000000000352ef0 Call Trace: net_dm_packet_report net/core/drop_monitor.c:700 [inline] net_dm_packet_work+0xafd/0x1290 net/core/drop_monitor.c:739 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396 process_scheduled_works kernel/workqueue.c:3479 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__skb_pull include/linux/skbuff.h:2847 [inline] RIP: 0010:skb_pull_inline include/linux/skbuff.h:2854 [inline] RIP: 0010:skb_pull.cold+0x29/0x2b net/core/skbuff.c:2677 Code: 0b e8 6b b3 9c 00 44 89 65 70 89 de 48 c7 c7 60 cc 38 8d e8 b9 e6 b2 ff 31 d2 48 89 ee 48 c7 c7 a0 cc 38 8d e8 e8 30 26 08 90 <0f> 0b e8 40 b3 9c 00 4c 89 e2 be 01 00 00 00 48 c7 c7 00 ff ca 90 RSP: 0018:ffffc900044df9f0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 00000000000000ea RCX: 0000000000000000 RDX: ffff88802461a580 RSI: ffffffff816f5ede RDI: ffff88802461a580 RBP: ffff88802c76ca00 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000001b38 R13: 0000000000001a4e R14: 0000000000001b38 R15: ffff88802c76ca00 FS: 0000000000000000(0000) GS:ffff8880d5c5c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa64e227dac CR3: 000000000eb96000 CR4: 0000000000352ef0 --- 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