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smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=oNY+b4wf; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="oNY+b4wf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 371B81F000E9; Wed, 20 May 2026 12:05:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779278752; bh=+zLIaM5TyiQu+/+rrgc9oimvpZ04kcixkpZqRos2n48=; h=Date:Subject:To:References:From:Cc:In-Reply-To; b=oNY+b4wfJ5QzUCJYtoiTXs0pKZHkqxUp9rmeM6I6QH05DF369WqJOsb1s2ZmKBXag IeNdQksgEpTAHGMSssOzO/qfpVJfHGX3JgeMZhhq7yJALCBV6r6pvFSUz0GaBYeiX/ YcH83qVmwijn7c8YJ7uVilake1bg3r7ai0JKwpRn1h5GdtfBCXZx22BBL3YKFqBCiq UsVj8pA3Mrg6jK5mticpJvC3fJR9zDthRBsCGBVxyKg9+SpVoKKNvgoOR7AVGZIaVT h9iJs50jcFgDpDq6RuWf4fb+3z0a7C7kNY9oxqRFnT66Ax950na57xmNLcsP9piLtY 3GG34xWS4vkog== Message-ID: <91a3a37b-7c4e-409b-b85c-36b530a738fe@kernel.org> Date: Wed, 20 May 2026 22:05:45 +1000 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta Subject: Re: [syzbot] [mptcp?] WARNING in mptcp_pm_alloc_anno_list (2) Content-Language: fr To: syzbot References: <6a0da138.170a0220.3cbd30.0141.GAE@google.com> From: Matthieu Baerts Cc: davem@davemloft.net, edumazet@google.com, geliang@kernel.org, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, martineau@kernel.org, mptcp@lists.linux.dev, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Autocrypt: addr=matttbe@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit Hello, On 20/05/2026 21:55, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: ab5fce87a778 Merge tag 'perf-tools-fixes-for-v7.1-2026-05-.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=175fcca6580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=cb5b551cf65fa040 > dashboard link: https://syzkaller.appspot.com/bug?extid=55c2a5c871441261ed14 > compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/e36518c61bd7/disk-ab5fce87.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/cd934c0c8950/vmlinux-ab5fce87.xz > kernel image: https://storage.googleapis.com/syzbot-assets/88cf18661142/bzImage-ab5fce87.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+55c2a5c871441261ed14@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > mptcp_pm_is_kernel(msk) > WARNING: net/mptcp/pm.c:436 at mptcp_pm_alloc_anno_list+0x408/0x4d0 net/mptcp/pm.c:436, CPU#1: kworker/1:6/5792 > Modules linked in: > CPU: 1 UID: 0 PID: 5792 Comm: kworker/1:6 Tainted: G L syzkaller #0 PREEMPT(full) > Tainted: [L]=SOFTLOCKUP > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 > Workqueue: events mptcp_worker > RIP: 0010:mptcp_pm_alloc_anno_list+0x408/0x4d0 net/mptcp/pm.c:436 > Code: 8d 7b 30 49 c7 c0 00 6f 64 9b 48 c7 c1 40 f5 28 8d 31 d2 48 c7 c6 b0 43 77 8b e8 c3 b3 7c f6 e9 c6 fc ff ff e8 c9 5b 91 f6 90 <0f> 0b 90 31 db e9 09 fd ff ff 48 c7 c7 c4 39 d8 90 e8 22 27 fe f6 > RSP: 0018:ffffc90004187818 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: ffff888079295f00 RCX: ffffffff8b772ecf > RDX: ffff888029de1ec0 RSI: ffffffff8b773217 RDI: ffff888029de1ec0 > RBP: ffff88807e593100 R08: 0000000000000001 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 > R13: dffffc0000000000 R14: ffff88807e593100 R15: ffff88806a3a5e80 > FS: 0000000000000000(0000) GS:ffff88812446d000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000020000035e030 CR3: 0000000068e39000 CR4: 0000000000350ef0 > Call Trace: > > mptcp_pm_create_subflow_or_signal_addr+0xa7a/0x18a0 net/mptcp/pm_kernel.c:373 > mptcp_pm_nl_subflow_established net/mptcp/pm_kernel.c:443 [inline] > __mptcp_pm_kernel_worker+0xe5/0x1f0 net/mptcp/pm_kernel.c:1573 > mptcp_pm_worker+0x12b/0x320 net/mptcp/pm.c:1069 > mptcp_worker+0x15d/0x1420 net/mptcp/protocol.c:2976 > process_one_work+0xa0e/0x1980 kernel/workqueue.c:3314 > process_scheduled_works kernel/workqueue.c:3397 [inline] > worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478 > kthread+0x370/0x450 kernel/kthread.c:436 > ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 This one looks similar to https://github.com/multipath-tcp/mptcp_net-next/issues/620 Not sure how it happened, but it doesn't look serious. Probably an odd path switching between path-managers during the establishment of a connection, or a reconnect. To be investigated, but a reproducer would help here. Cheers, Matt -- Sponsored by the NGI0 Core fund.