From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f205.google.com (mail-il1-f205.google.com [209.85.166.205]) (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 D205D28A1D5 for ; Mon, 20 Oct 2025 16:32:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.205 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760977947; cv=none; b=R6XJj2IGMZPMzjCQiKUaWqXu07K3GwbFWl6sFwkkebQSWu4ePK0JwPaIQiPK7xPpo3dG/rh1gNoZaMQBlr+JCzpQIkYtsxxsWs5olhUzRJ3Ukv+VuWF1p17OyCAd7cL6QIn1cWj41hjWYTJWj7yguB6taL1ByV/ihstAU043Sv4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760977947; c=relaxed/simple; bh=600z495s1evJI1EY+NvxTALOA87tlhM1kkoyIBG7QkE=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=i0ubRAu00Wwg7vZzdwcklpPIOjsANa11oS/KpvL+jHi/LHkpXeXMBM2tafl5vGiVBaJnm0QKb1W+rB0OGCjyrOcKFlFTLSbgNS4GAe0vRKrxUtlyG5nGm2+xC/qIHUAiPGWTtVl+K38pT9eJ3RjinDMgaKoaNpHBr5CWK7X5xyA= 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=209.85.166.205 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-il1-f205.google.com with SMTP id e9e14a558f8ab-430da49fb0aso38837515ab.0 for ; Mon, 20 Oct 2025 09:32:25 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1760977945; x=1761582745; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=Rd8P69Nzz5SWptPrMJydUZ06mU/1xOSEFcFBQAWHEU0=; b=ekweKwKjFLaBKJUCe57v8r+HC2ID8/emsooaermP5jygjXCalJAMJg3BPJ6aux1ZVm xVryCOUpKStAJaG1yoE0M6LePPLQd9yg/ZieldiUUvX3DpBfIujFW2ZzjPt2+n+j2/FE XjZpqYEoECLiZHFz/L5/6Zh+/HBsZBUDBOAAVTS14Xk6XmIBCy7KbN8YRouRaNZ1RoBk qIarq4e8CWRFM5bW7KYjc9J7CKxt2sGeS+hGdyh8ecgwzH5s6dmWSlCUMSfwnQkmHbNG tBZkCaSFlzWKl/Sc1/XBHp2omU6KNlFSDFd8BQJthIjSOwhWjVXkVIt/1em+xpgS0GqO YL7w== X-Forwarded-Encrypted: i=1; AJvYcCXdCJEWtGLE2wwHhqHK1+ci5qGkYxeXh5bl5p1z42R5tI2SXNpApKF1nGKX9w+YCbpCkjuySvD/Js54EqM=@vger.kernel.org X-Gm-Message-State: AOJu0YyecNL8L0pBMmX99uVcMOus5uQqTK3A8jipS/ZRf4UVuADaM9F8 NK1R+on5kWmSFOEuaz4Js9AGCT9/nXZhiW8aIzs2R543lPaSbZ8ZwxMUIXvh8Z3D+LHz8h//GAD catDG9KZ57P4TURaHmeWxGf5jtSfU0SraQGSdwJi9TxYJ1AmOSSOIxHjrCPI= X-Google-Smtp-Source: AGHT+IH9e773xcK/yfQuSVUm4VHLKMYJTqheKgYug7CM7N/z7rmd26+pLNXizdzEx/RMXH+hrFyUziwbbvN4s5Cl8r1RO4ONjlrz Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a92:c24f:0:b0:427:6e7f:89f8 with SMTP id e9e14a558f8ab-430c5263cfdmr218212525ab.10.1760977944839; Mon, 20 Oct 2025 09:32:24 -0700 (PDT) Date: Mon, 20 Oct 2025 09:32:24 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68f66418.050a0220.91a22.044d.GAE@google.com> Subject: [syzbot] [net?] kernel BUG in ipgre_header (3) From: syzbot To: davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 561c80369df0 Merge tag 'tty-6.16-rc1-2' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=114649a2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e143c1cd9dadd720 dashboard link: https://syzkaller.appspot.com/bug?extid=a2a3b519de727b0f7903 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1215b1a2580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=106c01a2580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-561c8036.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0e51e7b3acac/vmlinux-561c8036.xz kernel image: https://storage.googleapis.com/syzbot-assets/431bb38ff9e1/bzImage-561c8036.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a2a3b519de727b0f7903@syzkaller.appspotmail.com skbuff: skb_under_panic: text:ffffffff8a12f557 len:1304825492 put:1304825396 head:ffff888044b36000 data:ffff887ff6ed528c tail:0x120 end:0x6c0 dev:team0 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:211! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted 6.16.0-syzkaller-12256-g561c80369df0 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: mld mld_ifc_work RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:211 Code: c7 40 f9 93 8c 48 8b 74 24 08 48 8b 54 24 10 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 55 41 57 41 56 e8 5e 0d f5 ff 48 83 c4 20 90 <0f> 0b cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900001b7418 EFLAGS: 00010286 RAX: 0000000000000097 RBX: dffffc0000000000 RCX: b46b6e5b0ea16b00 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: 00000000000006c0 R08: ffffc900001b7127 R09: 1ffff92000036e24 R10: dffffc0000000000 R11: fffff52000036e25 R12: ffff888043e08a10 R13: ffff888044b36000 R14: ffff887ff6ed528c R15: 0000000000000120 FS: 0000000000000000(0000) GS:ffff88808d211000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c004aec000 CR3: 0000000059814000 CR4: 0000000000352ef0 Call Trace: skb_under_panic net/core/skbuff.c:221 [inline] skb_push+0xc3/0xe0 net/core/skbuff.c:2601 ipgre_header+0x67/0x290 net/ipv4/ip_gre.c:895 dev_hard_header include/linux/netdevice.h:3412 [inline] neigh_connected_output+0x286/0x460 net/core/neighbour.c:1619 neigh_output include/net/neighbour.h:547 [inline] ip6_finish_output2+0x11fb/0x16a0 net/ipv6/ip6_output.c:141 __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline] ip6_finish_output+0x234/0x7d0 net/ipv6/ip6_output.c:226 NF_HOOK+0x9e/0x380 include/linux/netfilter.h:318 mld_sendpack+0x800/0xd80 net/ipv6/mcast.c:1860 mld_send_cr net/ipv6/mcast.c:2159 [inline] mld_ifc_work+0x83e/0xd60 net/ipv6/mcast.c:2698 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:211 Code: c7 40 f9 93 8c 48 8b 74 24 08 48 8b 54 24 10 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 55 41 57 41 56 e8 5e 0d f5 ff 48 83 c4 20 90 <0f> 0b cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900001b7418 EFLAGS: 00010286 RAX: 0000000000000097 RBX: dffffc0000000000 RCX: b46b6e5b0ea16b00 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: 00000000000006c0 R08: ffffc900001b7127 R09: 1ffff92000036e24 R10: dffffc0000000000 R11: fffff52000036e25 R12: ffff888043e08a10 R13: ffff888044b36000 R14: ffff887ff6ed528c R15: 0000000000000120 FS: 0000000000000000(0000) GS:ffff88808d211000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c004af0000 CR3: 0000000000e16000 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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