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Fri, 29 May 2026 00:48:35 -0700 (PDT) Received: from [192.168.88.32] ([150.228.93.150]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4909c1035ebsm11391635e9.5.2026.05.29.00.48.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 29 May 2026 00:48:34 -0700 (PDT) Message-ID: <452a83a2-f715-4f22-906e-0d2cc0dd1240@redhat.com> Date: Fri, 29 May 2026 09:48:33 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mptcp?] KMSAN: uninit-value in mptcp_established_options To: Matthieu Baerts , kuniyu@google.com Cc: syzbot , linux-kernel@vger.kernel.org, mptcp@lists.linux.dev, syzkaller-bugs@googlegroups.com References: <69f8e352.170a0220.bb392.0005.GAE@google.com> <2a9bde65-d2de-44cc-9192-e7aa8a0935a7@kernel.org> <672f5b7d-6fa0-41c5-a950-2890028c8572@redhat.com> Content-Language: en-US From: Paolo Abeni In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 5/29/26 4:41 AM, Matthieu Baerts wrote: > On 08/05/2026 19:27, Paolo Abeni wrote: >> On 5/7/26 9:44 AM, Matthieu Baerts wrote: >>> Hi Paolo, Kuniyuki, >>> >>> On 04/05/2026 20:20, syzbot wrote: >>>> Hello, >>>> >>>> syzbot has tested the proposed patch but the reproducer is still triggering an issue: >>>> KMSAN: uninit-value in irqentry_exit_to_kernel_mode_preempt >>> >>> It looks like the issue is different now: > > (...) > >>> Plus I'm not exactly sure to understand the issue here: mp_opt is >>> defined and used only in mptcp_incoming_options(), and I don't see >>> anything using it after the end of this function. Or did I miss something? >> >> I also had hard time understanding the backtrace, I think some frames >> are omitted/missing (it happens sometime, IDK why), specifically the one >> related to mptcp_options_received() - which would be useful to >> understand the issue. > > Because the other issue spot by syzbot seems to unrelated, do you plan > to send your patch upstream? Or do you prefer if someone else does it? I'm sorry /me is losing track of multiple items. I can send a formal patch to the mptcp ML for: https://lore.kernel.org/all/5841afcc-13ea-4bee-8645-634a02e76c4f@redhat.com/#t /P