From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f77.google.com (mail-ot1-f77.google.com [209.85.210.77]) (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 52F4D244694 for ; Thu, 11 Dec 2025 17:32:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765474351; cv=none; b=AaRiOQR514vO8ILRvx9cGf6ckC+CvT403oD3RgBHxJ6pbEkCe2FCx+WSnyRtQwh4Y0khKRMw4hOi6UeUaKIZiR89KCA2toOvYjE8Nwt2q1D/LFkQ1HNLX9WdJSodfwxMMQRB2owuel9BGBJ8tS7jdk7fjlVrpLA/UD5TKqHiemQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765474351; c=relaxed/simple; bh=Pq2Bw2DWrShWwJl/egUoA7fuK84IsjNOXi32yyWsPzU=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=EVXujt4QTYaxvGN+J8N0bK0yANquElY+3/XRZyOtA4uC2HxwXKXNmLX5QtWo5oCHbrehFxFhiRh3dHoEKkhGFT5esLFOqigH8sc3rujZde5a5yadbr2Q/J3OrTq4CoXbhVTG6KsA2jvVWYq/k5fbMOHs9GcEZo9o8twZe1X08Q8= 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=209.85.210.77 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-ot1-f77.google.com with SMTP id 46e09a7af769-7c76977192eso786618a34.3 for ; Thu, 11 Dec 2025 09:32:29 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1765474348; x=1766079148; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=Rjf4r/ZxuzJlSfdg0JcN02rQUYZIDar/whNi6MdTSy4=; b=j2+gKHOTiK9lF2cGDXJiwFbZGPWMk17o5jyhvBKFtKxbXl3HnIekxEtwpS8Q7+xU3l m5XuTFKLBuRqL5+Vs1Hp8LpnZd58dsm/K5WwxW7nlXUVPYmHcj+hw38jARhv43LqYr9l e7AHhGRMXJNEv0Yu6w5iAG/1qwGaaryF6Qtxxsou1YtTutZ9+3169efWgmn/8Qsa/6jb fzgtV4oxijVcynB18yl59MjykdqaH1oIPJGbPAgWAu8etleuJ2MCY4161qRdLdGECNQa vXzU4JKEnqXsHPy7KxIrT7qTNia4BRqYk9cJbdthZ6QR8B2p42bWmUTbl5FCZolEJMgS ekmw== X-Forwarded-Encrypted: i=1; AJvYcCXJZECnKc98oxOqOD68SV7beL6i6ujm8F87YowWHfCVQSOr6yK6s6Ki2IVxG2OP3syk5ybqQk0=@vger.kernel.org X-Gm-Message-State: AOJu0YxkUYMgkey7AWoADjKeSvFreQQ8ydLNv8kp+3l7nUS+U+xRneP3 nFjzKrFOwH2Hf+/GdUOg+WDm9MqaLgDXu4cSeZ9ciZRSDhhoGSclKQXnU3oskiKNQ2FNlZpOyMG pEkLRT4GcJBjWv4GnQmOYEKbLhupd7IK5xiXIqukhYKaCpkY+Qpag8VW7HC4= X-Google-Smtp-Source: AGHT+IFF/RBlHj0qSF5akM0pBM8P+n68absJ+JwHZ3udSAtc6jvYVyO4KXuQW1F9AZF7kCKFxVQVD1ozXX5rt/fep6S8SZT9nAPn Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2905:b0:659:9a49:8f25 with SMTP id 006d021491bc7-65b2ad474f5mr3676704eaf.54.1765474348184; Thu, 11 Dec 2025 09:32:28 -0800 (PST) Date: Thu, 11 Dec 2025 09:32:28 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <693b002c.a70a0220.33cd7b.0033.GAE@google.com> Subject: [syzbot] [net?] kernel BUG in ip6gre_header (6) 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: 2061f18ad76e Merge tag 'caps-pr-20251204' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10cb0992580000 kernel config: https://syzkaller.appspot.com/x/.config?x=eaa3e2adda258a7 dashboard link: https://syzkaller.appspot.com/bug?extid=43a2ebcf2a64b1102d64 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14e5dc1a580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11fe021a580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-2061f18a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/28ad059bceaa/vmlinux-2061f18a.xz kernel image: https://storage.googleapis.com/syzbot-assets/747fcec76ac7/bzImage-2061f18a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+43a2ebcf2a64b1102d64@syzkaller.appspotmail.com skbuff: skb_under_panic: text:ffffffff8a1d69a8 len:136 put:40 head:ffff888059bc7000 data:ffff888059bc6fe8 tail:0x70 end:0x6c0 dev:team0 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:213! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted syzkaller #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:213 Code: c7 e0 1a 6f 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 8e 94 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:ffffc900001b7280 EFLAGS: 00010282 RAX: 0000000000000087 RBX: dffffc0000000000 RCX: 98444bb9450e1700 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: 00000000000006c0 R08: ffffc900001b6f87 R09: 1ffff92000036df0 R10: dffffc0000000000 R11: fffff52000036df1 R12: ffff88804ce8add0 R13: ffff888059bc7000 R14: ffff888059bc6fe8 R15: 0000000000000070 FS: 0000000000000000(0000) GS:ffff88808d683000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555bb765c8 CR3: 000000001fd7c000 CR4: 0000000000352ef0 Call Trace: skb_under_panic net/core/skbuff.c:223 [inline] skb_push+0xc3/0xe0 net/core/skbuff.c:2641 ip6gre_header+0xc8/0x790 net/ipv6/ip6_gre.c:1371 dev_hard_header include/linux/netdevice.h:3436 [inline] neigh_connected_output+0x286/0x460 net/core/neighbour.c:1618 neigh_output include/net/neighbour.h:556 [inline] ip6_finish_output2+0xfb3/0x1480 net/ipv6/ip6_output.c:136 __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline] ip6_finish_output+0x234/0x7d0 net/ipv6/ip6_output.c:220 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247 NF_HOOK+0x9e/0x380 include/linux/netfilter.h:318 mld_sendpack+0x8d4/0xe60 net/ipv6/mcast.c:1855 mld_send_cr net/ipv6/mcast.c:2154 [inline] mld_ifc_work+0x83e/0xd60 net/ipv6/mcast.c:2693 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:213 Code: c7 e0 1a 6f 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 8e 94 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:ffffc900001b7280 EFLAGS: 00010282 RAX: 0000000000000087 RBX: dffffc0000000000 RCX: 98444bb9450e1700 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: 00000000000006c0 R08: ffffc900001b6f87 R09: 1ffff92000036df0 R10: dffffc0000000000 R11: fffff52000036df1 R12: ffff88804ce8add0 R13: ffff888059bc7000 R14: ffff888059bc6fe8 R15: 0000000000000070 FS: 0000000000000000(0000) GS:ffff88808d683000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc5c02a230 CR3: 000000003b4e8000 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