From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f208.google.com (mail-il1-f208.google.com [209.85.166.208]) (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 2EE9F16132F for ; Sat, 25 Oct 2025 16:35:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761410124; cv=none; b=HOdEv7op+tXszErRrInnaYZMAlaoDp/5jTmue8E6j6pYeDvTzAEd23Nu5FrO2UzlcaiWcX/s8DI/LpEDQGhLbMYe6ooDA3MiiaUNwvvpluctE/DEcvdLvoyFwnKQMyXK+YjgHaK8STOAHELyBQyqJofw9NQjNd3+xpeOisw66Rg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761410124; c=relaxed/simple; bh=iyOBRl5QZhzw+5Ro5vJB2OJl2o9qrxD7/mSjzKjx6KI=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=LAPEFbdh7YnBiWTDr6udwWLE6hf846WnqpJf/F08iwsX/Phzn8dFSRvytYwO/hU5+/kaPav9HM3KoM+sThrBkAdQSAzSIBrOgoqoKYaLYRfAmbJ0MAStMMNH7lIAZVT61ybOgEgW2YnuElXsMxQx6SVF4lo+iQE1N8SpJfuYMIk= 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=209.85.166.208 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-f208.google.com with SMTP id e9e14a558f8ab-430afceae09so35080905ab.0 for ; Sat, 25 Oct 2025 09:35:23 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1761410122; x=1762014922; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=L/TBpiav1G79AIOTkdY4adnGJwgmMIA5+MCuyC38fbg=; b=CNY/i4o1qhWyKy9Prz7/ZPqbQWu002JYmoCUi/+HOvv2BnnVcVSzvw0n1hq/cAbRQd N6cjSoJmaXeXLCeU4RfH9U6Ojpl+o1CyBxjIeyDn1clkafwNcoqq/ijxs3vEAC2c3rZO Jnb+MJOCk6yFJuBcvxGB/Eqsa4etDORgHdhNHnqEIDfiYgDKozkP7OyJ8bkUPOX2yC8+ JCCKvTmgt/SaEs9JnIoTgVXVzt8K5Wwc16FZD3n3BYiCwXrm2MV6j+7QSNfUhaHPcPTV T+TXtTDm0NOgJWDEMFFuPiJZsurwCho27o+eS6eoTec7aLzXgVokvsoESLFPPSq5a2S7 ViIg== X-Forwarded-Encrypted: i=1; AJvYcCW7eaHZUB7PNNlPf0/eaK36bu0Q36rRDuYw7p2fcsb9CZ5zh0UMea8q/Q/+BGgurtkCMHX5hA==@lists.linux.dev X-Gm-Message-State: AOJu0YzHxq6G9zY97OLxuIPfLQGnQapfqRvodzGMJRA8bV3zf8ZosJ04 sKtgh7BJPeMsmekRDllVdHjD7lun3C7pLcZpfe/U9orxXbMB6DjJPOxTLFa5lVJ+1KVj3HGsP+x xKChYehlyrMRC+hiVQFryIswtUzHZp+do/YGPC4iVLN/6rN+71EW5s755DSA= X-Google-Smtp-Source: AGHT+IGeqEzwanU1biO5d+ivaOCUX5hEsxCyYT+xT+jf2Li+zt8m+I5UT6TpcYDR9S2JPh6BYwnuqkplXrB0G8rg6VjlCJJZR0ul Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:3f04:b0:430:c49d:750c with SMTP id e9e14a558f8ab-431ebed79admr77062145ab.27.1761410122404; Sat, 25 Oct 2025 09:35:22 -0700 (PDT) Date: Sat, 25 Oct 2025 09:35:22 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68fcfc4a.050a0220.346f24.02fb.GAE@google.com> Subject: [syzbot] [mptcp?] WARNING in mptcp_pm_nl_del_addr_doit 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: 6548d364a3e8 Merge tag 'cgroup-for-6.18-rc2-fixes' of git:.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11da4e7c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f953a3e1b3e60637 dashboard link: https://syzkaller.appspot.com/bug?extid=f56f7d56e2c6e11a01b6 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/a6472a8e035a/disk-6548d364.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1547185ddf28/vmlinux-6548d364.xz kernel image: https://storage.googleapis.com/syzbot-assets/d4610741deb8/bzImage-6548d364.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f56f7d56e2c6e11a01b6@syzkaller.appspotmail.com netlink: 8 bytes leftover after parsing attributes in process `syz.7.6472'. netlink: 8 bytes leftover after parsing attributes in process `syz.7.6472'. ------------[ cut here ]------------ WARNING: CPU: 0 PID: 27976 at net/mptcp/pm_kernel.c:1053 __mark_subflow_endp_available net/mptcp/pm_kernel.c:1053 [inline] WARNING: CPU: 0 PID: 27976 at net/mptcp/pm_kernel.c:1053 mptcp_nl_remove_subflow_and_signal_addr net/mptcp/pm_kernel.c:1088 [inline] WARNING: CPU: 0 PID: 27976 at net/mptcp/pm_kernel.c:1053 mptcp_pm_nl_del_addr_doit+0xe2c/0x11d0 net/mptcp/pm_kernel.c:1190 Modules linked in: CPU: 0 UID: 0 PID: 27976 Comm: syz.7.6472 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:__mark_subflow_endp_available net/mptcp/pm_kernel.c:1053 [inline] RIP: 0010:mptcp_nl_remove_subflow_and_signal_addr net/mptcp/pm_kernel.c:1088 [inline] RIP: 0010:mptcp_pm_nl_del_addr_doit+0xe2c/0x11d0 net/mptcp/pm_kernel.c:1190 Code: 01 00 00 49 89 c6 e8 93 b2 82 f6 e9 ed fb ff ff e8 89 b2 82 f6 48 89 df be 03 00 00 00 e8 ac 8d 53 f9 eb 9c e8 75 b2 82 f6 90 <0f> 0b 90 e9 90 fe ff ff 89 d9 80 e1 07 38 c1 0f 8c d9 fb ff ff 48 RSP: 0018:ffffc9000c3e71a0 EFLAGS: 00010283 RAX: ffffffff8b3d917b RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc90019844000 RSI: 0000000000009d14 RDI: 0000000000009d15 RBP: ffffc9000c3e73b0 R08: ffff88802f74eea7 R09: 1ffff11005ee9dd4 R10: dffffc0000000000 R11: ffffed1005ee9dd5 R12: ffff888068e67080 R13: ffff88802f74ee98 R14: ffff88802f74e400 R15: 1ffff11005ee9dd3 FS: 00007f57ed7746c0(0000) GS:ffff888125d06000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000000c038 CR3: 000000004ebf8000 CR4: 0000000000350ef0 Call Trace: genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 ____sys_sendmsg+0x505/0x830 net/socket.c:2630 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2684 __sys_sendmsg net/socket.c:2716 [inline] __do_sys_sendmsg net/socket.c:2721 [inline] __se_sys_sendmsg net/socket.c:2719 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2719 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f57ec98efc9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f57ed774038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f57ecbe6090 RCX: 00007f57ec98efc9 RDX: 000000002000c094 RSI: 0000200000000000 RDI: 0000000000000009 RBP: 00007f57eca11f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f57ecbe6128 R14: 00007f57ecbe6090 R15: 00007ffeff6c13c8 --- 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