From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f206.google.com (mail-il1-f206.google.com [209.85.166.206]) (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 247453321D3 for ; Fri, 21 Nov 2025 12:11:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.206 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763727097; cv=none; b=CLPXrq3bD2s6OLj98gHrk0mJhmAz+t4CxLcpGcvhuVGlD6stOPj2vA2dOIlXdQv+l2CYdTMnJ52iLNE725Zzo5+d2/qBSE1K++656cw1mjhL+bTAaPJV2K4BI60YEjctOkgyadwx2tdo4WtCKvrO4g78MNppjbWWCVrrXDst4l8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763727097; c=relaxed/simple; bh=2D5fuZ4CnSOfDrMMePKN/OyKAL0l1ZNmoSbpv5mEe7A=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=dbZB6CGdJEfpoiDHj578LfATBJ44T0ToXGDVBzaLUIQV8r/Ai3lczyxrRzBWW2WMfleyo6rFRfLxYzGO9gkZPWwhc84zrWKRH6iwp0QQvCURe5H4KClzn3j2to2ipK2n1HZaLwKMJjYWNAcxxv19K2b5T93BvS2d712HRs2M+lU= 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=209.85.166.206 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-f206.google.com with SMTP id e9e14a558f8ab-43478824a6fso18848455ab.3 for ; Fri, 21 Nov 2025 04:11:34 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1763727094; x=1764331894; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=zV30rAUHe9nf5njvs4h81en2iC+xQgzdRBM2uW2ZegQ=; b=Ua+GoMSMKYlkUfRhef+R+ZkqLP/1JzsNc8NBMZHBou7PbLYpLvl2xjSLPxYYogQ34C jivN/INojkQVOFJ6SClYG0mZIXp8erCT1Zqe98GDrSYh26MYN5Hp98qAVcdWweeBPNLl A9Gsk7jIcEwh+Z7AWFJcNvM7V3eE8bEX7EG3EPyRqUwDZFr/kdhaE4bUlttV7xeTo3nq +QLaKjC2gmLma/rVoF5Gx//qi6gC3MzsHRifEVa4tyh1CHgw6vw9CZ4ERaey8z7Tozok Vo14cPnZKEWl7ikY0loldp7N1hqa8IX/1XvilL8uObZLTNqjBY+16X5mHSF9aydNhKAU A+8w== X-Forwarded-Encrypted: i=1; AJvYcCWATawCaBKIjOaVnX9h+VLfqbp7cGCxg3YA/7J8FtrG+gfT4s13XDowZCRTYnaMN29SnLYl0w==@lists.linux.dev X-Gm-Message-State: AOJu0Yxz4O4rpQIxgI1MYstuxoxsYD4jOy5PIwOSaazKplwXSQLegaTB EI+5cxTVVd8OxlryHD1lMUAx66oZDiF/ZjLXpl4wm3D0JTmc0wt5lupMuyHa4BtMqSl/Spdt/0B 3NcrqsvrSdCbhQLy1HRS+jKNc43B0aT8+9VR1BaBcM5jJdckhZTdI/qaEvnI= X-Google-Smtp-Source: AGHT+IHbVGWfWIxz44VI+EgtiCO1Fa4flWCMu2SCDaKm0jcgj3g6PkOE0/IZyXHe2m0xdxZ0y/2RSZVHdkSoiFzX3f0038AMJKul Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:2608:b0:433:23ba:2d84 with SMTP id e9e14a558f8ab-435b8c1f639mr17222345ab.17.1763727094346; Fri, 21 Nov 2025 04:11:34 -0800 (PST) Date: Fri, 21 Nov 2025 04:11:34 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <692056f6.a70a0220.2ea503.004e.GAE@google.com> Subject: [syzbot] [mptcp?] WARNING in __mptcp_move_skbs_from_subflow (2) 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: fd95357fd8c6 Merge tag 'sched_ext-for-6.18-rc6-fixes-2' of.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17220e92580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1cd7f786c0f5182f dashboard link: https://syzkaller.appspot.com/bug?extid=9475dcc0b42355ded022 compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 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-fd95357f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9301ea2e80a9/vmlinux-fd95357f.xz kernel image: https://storage.googleapis.com/syzbot-assets/13592a9d2a74/bzImage-fd95357f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9475dcc0b42355ded022@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 2 PID: 1143 at net/mptcp/protocol.c:718 __mptcp_move_skbs_from_subflow+0xeda/0x3360 net/mptcp/protocol.c:718 Modules linked in: CPU: 2 UID: 0 PID: 1143 Comm: kworker/u32:7 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: krdsd rds_shutdown_worker RIP: 0010:__mptcp_move_skbs_from_subflow+0xeda/0x3360 net/mptcp/protocol.c:718 Code: 75 f6 e8 09 a8 75 f6 8b 5c 24 18 8b 6c 24 70 01 5c 24 1c 89 ee 89 df e8 74 a2 75 f6 39 dd 0f 83 d9 f3 ff ff e8 e7 a7 75 f6 90 <0f> 0b 90 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 48 48 c1 ea 03 RSP: 0018:ffffc90000537aa0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000001508 RCX: ffffffff8b46af8c RDX: ffff888021412480 RSI: ffffffff8b46af99 RDI: 0000000000000004 RBP: 00000000000010bc R08: 0000000000000004 R09: 0000000000001508 R10: 00000000000010bc R11: 0000000000000001 R12: ffff88806b1b00e8 R13: ffffffff9afc3e80 R14: dffffc0000000000 R15: ffff88806b1b0000 FS: 0000000000000000(0000) GS:ffff888097a0d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000c230000 CR3: 00000000663a8000 CR4: 0000000000352ef0 Call Trace: move_skbs_to_msk net/mptcp/protocol.c:833 [inline] __mptcp_data_ready net/mptcp/protocol.c:853 [inline] mptcp_data_ready+0x251/0x6c0 net/mptcp/protocol.c:870 subflow_state_change+0x4fb/0x800 net/mptcp/subflow.c:1870 tcp_rcv_state_process+0x453b/0x6490 net/ipv4/tcp_input.c:7073 tcp_v6_do_rcv+0x7b8/0x1dc0 net/ipv6/tcp_ipv6.c:1675 tcp_v6_rcv+0x2ab5/0x48f0 net/ipv6/tcp_ipv6.c:1922 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:474 [inline] ip6_rcv_finish+0x1ac/0x580 net/ipv6/ip6_input.c:79 ip_sabotage_in+0x21e/0x290 net/bridge/br_netfilter_hooks.c:990 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_slow+0xbe/0x200 net/netfilter/core.c:623 nf_hook.constprop.0+0x424/0x750 include/linux/netfilter.h:273 NF_HOOK include/linux/netfilter.h:316 [inline] ipv6_rcv+0xa4/0x650 net/ipv6/ip6_input.c:311 __netif_receive_skb_one_core+0x12d/0x1e0 net/core/dev.c:6079 __netif_receive_skb+0x1d/0x160 net/core/dev.c:6192 netif_receive_skb_internal net/core/dev.c:6278 [inline] netif_receive_skb+0x137/0x7b0 net/core/dev.c:6337 NF_HOOK include/linux/netfilter.h:318 [inline] NF_HOOK include/linux/netfilter.h:312 [inline] br_pass_frame_up+0x346/0x490 net/bridge/br_input.c:70 br_handle_frame_finish+0x12fe/0x1f00 net/bridge/br_input.c:222 br_nf_hook_thresh+0x307/0x410 net/bridge/br_netfilter_hooks.c:1167 br_nf_pre_routing_finish_ipv6+0x76a/0xfc0 net/bridge/br_netfilter_ipv6.c:154 NF_HOOK include/linux/netfilter.h:318 [inline] br_nf_pre_routing_ipv6+0x3cd/0x8c0 net/bridge/br_netfilter_ipv6.c:184 br_nf_pre_routing+0x860/0x15b0 net/bridge/br_netfilter_hooks.c:508 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_bridge_pre net/bridge/br_input.c:291 [inline] br_handle_frame+0xb28/0x14e0 net/bridge/br_input.c:442 __netif_receive_skb_core.constprop.0+0xa25/0x4bd0 net/core/dev.c:5966 __netif_receive_skb_one_core+0xb0/0x1e0 net/core/dev.c:6077 __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 do_softirq kernel/softirq.c:523 [inline] do_softirq+0xb2/0xf0 kernel/softirq.c:510 __local_bh_enable_ip+0x100/0x120 kernel/softirq.c:450 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:936 [inline] __dev_queue_xmit+0xb06/0x4490 net/core/dev.c:4790 dev_queue_xmit include/linux/netdevice.h:3365 [inline] neigh_hh_output include/net/neighbour.h:531 [inline] neigh_output include/net/neighbour.h:545 [inline] ip6_finish_output2+0x1184/0x1cf0 net/ipv6/ip6_output.c:136 __ip6_finish_output+0x3cd/0x1010 net/ipv6/ip6_output.c:209 ip6_finish_output net/ipv6/ip6_output.c:220 [inline] NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x253/0x710 net/ipv6/ip6_output.c:247 dst_output include/net/dst.h:464 [inline] NF_HOOK include/linux/netfilter.h:318 [inline] NF_HOOK include/linux/netfilter.h:312 [inline] ip6_xmit+0x1512/0x23f0 net/ipv6/ip6_output.c:371 inet6_csk_xmit+0x444/0x7f0 net/ipv6/inet6_connection_sock.c:120 __tcp_transmit_skb+0x1d67/0x44d0 net/ipv4/tcp_output.c:1628 tcp_transmit_skb net/ipv4/tcp_output.c:1646 [inline] tcp_write_xmit+0x12a9/0x86e0 net/ipv4/tcp_output.c:2999 __tcp_push_pending_frames+0xaf/0x390 net/ipv4/tcp_output.c:3182 tcp_send_fin+0x121/0x1050 net/ipv4/tcp_output.c:3800 __tcp_close+0xa46/0x1120 net/ipv4/tcp.c:3207 tcp_close+0x28/0x120 net/ipv4/tcp.c:3298 inet_release+0xed/0x200 net/ipv4/af_inet.c:437 inet6_release+0x4f/0x70 net/ipv6/af_inet6.c:487 __sock_release net/socket.c:662 [inline] sock_release+0x91/0x1d0 net/socket.c:690 rds_tcp_conn_path_shutdown+0x1f9/0x410 net/rds/tcp_connect.c:220 rds_conn_shutdown+0x28b/0xaa0 net/rds/connection.c:399 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263 process_scheduled_works kernel/workqueue.c:3346 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427 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 --- 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