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 EDF1A33F366 for ; Thu, 20 Nov 2025 20:58:30 +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=1763672314; cv=none; b=rDvh95sAVoIHfzL+Cbojdw3h+J/Am+DV95a7w9Wd1TlhfCoEvBv6RQtr6lGfedbyWYJ0XOOH2D1CbJNPzB5JUJbmDCRhVESDxP6xT9b+dhxmELjAKx2xjJHFQxa28m+FY3/yEVGY3xXPRFg3E3gF+3lYlK0TuTcKFgaixLJ18zw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763672314; c=relaxed/simple; bh=U1JaPEvAFIFM5GBCerQtXTCxm6A+HV551Vy1xWavn0k=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=n5fX0vwyBLoHsd1yPuSH2/aqKTn6NqVjAtf8hLRQrIA2etW8c/2iB4UhaDyYV/LPQCrDv8DUiGifTyfUM4jU3Rc3mwVtAyU7wSRPpvFHOuwuWs+EL4CP81nsFWzKNnvQ42oTWwC7MfHK8NCBBxN7D03bwG7nWWxjbTTvExpy4ok= 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-4337e3aca0cso15713445ab.1 for ; Thu, 20 Nov 2025 12:58:30 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1763672309; x=1764277109; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=JatGuBdz8ZGZO1wKcI2oQG5Aywx+T8e7anUEr9P78xU=; b=qmZymrPoD2dLrvV5zx0Aqij8yCpL7b56QOuiQC/J+s9mvaV1jDE5aYMiJVS+5VX+7C nTs54gtiqAvqxIL2DFSNs8AjpYAUvI7h4wG/hTNleWwhQluOfMZEiap/XJjvOFMpmEzQ wIdjqf6OoXHnCG0ZoJHzbDSW2HGyHhgQGk9ni0U805/btvfc9zM+uwy61kCvo+Scv9+R PZ6s0U0rH4FUlpDUMvALqp5lryu2vkVyfNCqvYKIUKIakjwgL4j1RFHMOBe6xxNURv86 EE6VvY2fUfs22997S48uYpm4MozJXA/Vs5KHzYDJZlLDnAMC1oOcYahnX37rs/b9nM3H RaAQ== X-Forwarded-Encrypted: i=1; AJvYcCUtPbJ9XZfLV3A338NLcR6HEw7KJfTjP1BDfRqje3x2YP8FvHx1AC+cLkhaE/KFhfalL3SrlNnaCFJ6OMY=@vger.kernel.org X-Gm-Message-State: AOJu0YwXip/CErsCjtbXL916b0YXhyB5xbnpnYhKoIU0Wnwf1MxMkOye PGWjXabbFRR2taaOBqoz7PBlRo0yUdkiU9vNL8xtmBMwkLe/fvw1NFli+3BOlNnKhB29kjmKV7N /xabvIkZtmtL832aQklq6ym+96jH3UxER+eLU8JCTdWi/lBKreHdAGHaaPpc= X-Google-Smtp-Source: AGHT+IGYAvS2Z0gKNmabp2o3OeNbFYDd3Y5OgjHJ1mJxa32vG5Vaj/kFbBiY2n//s2+U8qQQLrQDSK3tsD2UqMZlARM9XD73lXM4 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:18ce:b0:435:a148:cbe with SMTP id e9e14a558f8ab-435b8e9da74mr783315ab.41.1763672308949; Thu, 20 Nov 2025 12:58:28 -0800 (PST) Date: Thu, 20 Nov 2025 12:58:28 -0800 In-Reply-To: <68a5c278.050a0220.3d78fd.0000.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <691f80f4.a70a0220.2ea503.003a.GAE@google.com> Subject: Re: [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" syzbot has found a reproducer for the following issue on: HEAD commit: 8e621c9a3375 Merge tag 'net-6.18-rc7' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12887a12580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1cd7f786c0f5182f dashboard link: https://syzkaller.appspot.com/bug?extid=0ff6b771b4f7a5bce83b compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=133c9a12580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=117a2a12580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/6be75789d60e/disk-8e621c9a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/62e7a40cfe48/vmlinux-8e621c9a.xz kernel image: https://storage.googleapis.com/syzbot-assets/3e523caa536d/bzImage-8e621c9a.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: 0 PID: 15 at net/mptcp/subflow.c:1519 subflow_data_ready+0x40b/0x7c0 net/mptcp/subflow.c:1519 Modules linked in: CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:subflow_data_ready+0x40b/0x7c0 net/mptcp/subflow.c:1519 Code: 89 ee e8 88 f8 72 f6 40 84 ed 75 21 e8 9e fd 72 f6 44 89 fe bf 07 00 00 00 e8 d1 f8 72 f6 41 83 ff 07 74 09 e8 86 fd 72 f6 90 <0f> 0b 90 e8 7d fd 72 f6 48 89 df e8 e5 ad ff ff 31 ff 89 c5 89 c6 RSP: 0018:ffffc90000147380 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888030aa72c0 RCX: ffffffff8b4959ef RDX: ffff88801d2cbc80 RSI: ffffffff8b4959fa RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000007 R10: 0000000000000004 R11: 00000d230000000c R12: ffff888033463c00 R13: 1ffff92000028e70 R14: ffff88802f9bbc00 R15: 0000000000000004 FS: 0000000000000000(0000) GS:ffff888124a0d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f841c04df98 CR3: 0000000078b7e000 CR4: 00000000003526f0 Call Trace: tcp_data_ready+0x110/0x550 net/ipv4/tcp_input.c:5355 tcp_data_queue+0x1aa6/0x5000 net/ipv4/tcp_input.c:5445 tcp_rcv_state_process+0xfb6/0x6490 net/ipv4/tcp_input.c:7159 tcp_v4_do_rcv+0x68e/0x10a0 net/ipv4/tcp_ipv4.c:1954 tcp_v4_rcv+0x3077/0x4db0 net/ipv4/tcp_ipv4.c:2374 ip_protocol_deliver_rcu+0xba/0x4c0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x3f2/0x720 net/ipv4/ip_input.c:239 NF_HOOK include/linux/netfilter.h:318 [inline] NF_HOOK include/linux/netfilter.h:312 [inline] ip_local_deliver+0x18e/0x1f0 net/ipv4/ip_input.c:260 dst_input include/net/dst.h:474 [inline] ip_rcv_finish net/ipv4/ip_input.c:453 [inline] NF_HOOK include/linux/netfilter.h:318 [inline] NF_HOOK include/linux/netfilter.h:312 [inline] ip_rcv+0x2e0/0x600 net/ipv4/ip_input.c:573 __netif_receive_skb_one_core+0x197/0x1e0 net/core/dev.c:6079 __netif_receive_skb+0x1d/0x160 net/core/dev.c:6192 process_backlog+0x439/0x15e0 net/core/dev.c:6544 __napi_poll.constprop.0+0xba/0x550 net/core/dev.c:7594 napi_poll net/core/dev.c:7657 [inline] net_rx_action+0x97f/0xef0 net/core/dev.c:7784 handle_softirqs+0x219/0x8e0 kernel/softirq.c:622 run_ksoftirqd kernel/softirq.c:1063 [inline] run_ksoftirqd+0x3a/0x60 kernel/softirq.c:1055 smpboot_thread_fn+0x3f7/0xae0 kernel/smpboot.c:160 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- 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.