From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f78.google.com (mail-io1-f78.google.com [209.85.166.78]) (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 6FE692DCF58 for ; Wed, 20 Aug 2025 12:41:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755693691; cv=none; b=MrFR0COwkwh90Uv0pGHnox2hN8O90buioBvbv5+Q+koKkygmxp03HLdlFX4icBd3hyw/fDzURpo7nSGx1RUypqmKxLOMSZSbMfQlaSgc0x2fcMfc25ez3PkDXdhGf80qT4vtWHDDeIy3vvhniqJ1N1+JqCynyFnjMwF1wp19hdY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755693691; c=relaxed/simple; bh=x78F7lRawwe1Z0wXQDL/XNv/NO5uAviym5okoWYCCG4=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=bkxMSEYZDLm0NKTdRwEAvUDot4oCREYvgg7ApL4J4IzUDZ+pphXECiaHg4zSSresQKfS0RItyV+J+0K3Yf+tldBu+gb3W7G88zA8XDm/VXWmfWa61grkZHgVSeT+5GzYNnwzOsSoueuGmeuPpBiRbTYzJWfrKHyyQuDcS8z5exo= 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=209.85.166.78 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-f78.google.com with SMTP id ca18e2360f4ac-884454c97dbso428120639f.1 for ; Wed, 20 Aug 2025 05:41:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1755693688; x=1756298488; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=79PojQnQKnnfTCReFZXRMGbZgUX1Dqbfz+VlKTtOi18=; b=kJnnvh3F33HSAULpaBy5SZDVpwGmOA9NnsjV8Br8Z74WGhm7NZDrGKovt5pD2xkEyG roUZ84Xg0YjkUaDOpUqfphcy0lWItAOq/U4n7h1sYeyymO3bBuHGqum/+Htkpfz0ut3D S3JyqxUKAVe2l0MeoTNYYSgqpNVeGo9d/lxUsdI1iYs8etihuQDG4R9FdznLmRsQfpxE uDgOGEvPIwwxywRmvwjyDwDAbthJfF+vdTfn/MzVDS6fnjI/aYWMdL5HzyA3S8pCzYz0 tQQBQ5aQyXREy8jA/HQSci8GSAEXPkbD3l6HjHx2naQn5ImiTKF7wT5cVQpTda3xuGxB HDgg== X-Forwarded-Encrypted: i=1; AJvYcCXTb6XGuAh78gKNiEPObWcy+2WNCzwet1T0f6XFC4aMdv1Ldg7fU9e0r/xTLWN0mcI/prAngLbmxz8Y00A=@vger.kernel.org X-Gm-Message-State: AOJu0YyqsQAncwIS8Hik/mEDihWikUbz6aI1S1XPrhS7FYWqiKsNXRfc vVmDhgerI1ghrolAT+6fM1KYuUOJ/+WN2AANrA7eT7Vu7EWaY049kfPyN3D704ilVlG+v4PBivc 7qIw4SQ7EF8VNsmoxj/umoHcXOH17tJM3DvWj1r6oU8rOKpv7fm2A2YRvF4I= X-Google-Smtp-Source: AGHT+IFbfTZVAfWArENtiYam9/cfnU1Ih1mBxJ8G64Cy9UG+vCbIq/2GwOYnouO9KA9ie9GdDmE6X0qZekWRu8sDNSc09b/nGd6w Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:388b:b0:87c:1d65:3aeb with SMTP id ca18e2360f4ac-884717e502bmr595120439f.2.1755693688491; Wed, 20 Aug 2025 05:41:28 -0700 (PDT) Date: Wed, 20 Aug 2025 05:41:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68a5c278.050a0220.3d78fd.0000.GAE@google.com> Subject: [syzbot] [mptcp?] WARNING in subflow_data_ready (4) From: syzbot To: davem@davemloft.net, edumazet@google.com, geliang@kernel.org, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, martineau@kernel.org, matttbe@kernel.org, mptcp@lists.linux.dev, 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: b19a97d57c15 Merge tag 'pull-fixes' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=174817a2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b7511150b112b9c3 dashboard link: https://syzkaller.appspot.com/bug?extid=0ff6b771b4f7a5bce83b compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 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-b19a97d5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d6e98c49ae62/vmlinux-b19a97d5.xz kernel image: https://storage.googleapis.com/syzbot-assets/c90ded1d8e17/bzImage-b19a97d5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0ff6b771b4f7a5bce83b@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 3 PID: 33 at net/mptcp/subflow.c:1515 subflow_data_ready+0x40b/0x7c0 net/mptcp/subflow.c:1515 Modules linked in: CPU: 3 UID: 0 PID: 33 Comm: ksoftirqd/3 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 RIP: 0010:subflow_data_ready+0x40b/0x7c0 net/mptcp/subflow.c:1515 Code: 89 ee e8 78 61 3c f6 40 84 ed 75 21 e8 8e 66 3c f6 44 89 fe bf 07 00 00 00 e8 c1 61 3c f6 41 83 ff 07 74 09 e8 76 66 3c f6 90 <0f> 0b 90 e8 6d 66 3c f6 48 89 df e8 e5 ad ff ff 31 ff 89 c5 89 c6 RSP: 0018:ffffc900006cf338 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888031acd100 RCX: ffffffff8b7f2abf RDX: ffff88801e6ea440 RSI: ffffffff8b7f2aca RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000007 R10: 0000000000000004 R11: 0000000000002c10 R12: ffff88802ba69900 R13: 1ffff920000d9e67 R14: ffff888046f81800 R15: 0000000000000004 FS: 0000000000000000(0000) GS:ffff8880d69bc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000560fc0ca1670 CR3: 0000000032c3a000 CR4: 0000000000352ef0 Call Trace: tcp_data_queue+0x13b0/0x4f90 net/ipv4/tcp_input.c:5197 tcp_rcv_state_process+0xfdf/0x4ec0 net/ipv4/tcp_input.c:6922 tcp_v6_do_rcv+0x492/0x1740 net/ipv6/tcp_ipv6.c:1672 tcp_v6_rcv+0x2976/0x41e0 net/ipv6/tcp_ipv6.c:1918 ip6_protocol_deliver_rcu+0x188/0x1520 net/ipv6/ip6_input.c:438 ip6_input_finish+0x1e4/0x4b0 net/ipv6/ip6_input.c:489 NF_HOOK include/linux/netfilter.h:318 [inline] NF_HOOK include/linux/netfilter.h:312 [inline] ip6_input+0x105/0x2f0 net/ipv6/ip6_input.c:500 dst_input include/net/dst.h:471 [inline] ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline] NF_HOOK include/linux/netfilter.h:318 [inline] NF_HOOK include/linux/netfilter.h:312 [inline] ipv6_rcv+0x264/0x650 net/ipv6/ip6_input.c:311 __netif_receive_skb_one_core+0x12d/0x1e0 net/core/dev.c:5979 __netif_receive_skb+0x1d/0x160 net/core/dev.c:6092 process_backlog+0x442/0x15e0 net/core/dev.c:6444 __napi_poll.constprop.0+0xba/0x550 net/core/dev.c:7494 napi_poll net/core/dev.c:7557 [inline] net_rx_action+0xa9f/0xfe0 net/core/dev.c:7684 handle_softirqs+0x216/0x8e0 kernel/softirq.c:579 run_ksoftirqd kernel/softirq.c:968 [inline] run_ksoftirqd+0x3a/0x60 kernel/softirq.c:960 smpboot_thread_fn+0x3f7/0xae0 kernel/smpboot.c:160 kthread+0x3c2/0x780 kernel/kthread.c:463 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- 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