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Wed, 18 Aug 2021 01:02:47 -0700 (PDT) To: syzbot , davem@davemloft.net, johan.hedberg@gmail.com, kuba@kernel.org, linux-bluetooth@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, luiz.dentz@gmail.com, marcel@holtmann.org, mathew.j.martineau@linux.intel.com, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk References: <00000000000012030e05c9c8bc85@google.com> From: Matthieu Baerts Subject: Re: [syzbot] KFENCE: use-after-free in kvm_fastop_exception Message-ID: <58cef9e0-69de-efdb-4035-7c1ed3d23132@tessares.net> Date: Wed, 18 Aug 2021 10:02:46 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: <00000000000012030e05c9c8bc85@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, On 18/08/2021 00:21, syzbot wrote: > syzbot has bisected this issue to: > > commit c4512c63b1193c73b3f09c598a6d0a7f88da1dd8 > Author: Matthieu Baerts > Date: Fri Jun 25 21:25:22 2021 +0000 > > mptcp: fix 'masking a bool' warning > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=122b0655300000 > start commit: b9011c7e671d Add linux-next specific files for 20210816 > git tree: linux-next > final oops: https://syzkaller.appspot.com/x/report.txt?x=112b0655300000 > console output: https://syzkaller.appspot.com/x/log.txt?x=162b0655300000 > kernel config: https://syzkaller.appspot.com/x/.config?x=a245d1aa4f055cc1 > dashboard link: https://syzkaller.appspot.com/bug?extid=7b938780d5deeaaf938f > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=157a41ee300000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14f78ff9300000 I'm pretty sure the commit c4512c63b119 ("mptcp: fix 'masking a bool' warning") doesn't introduce the reported bug. This minor fix is specific to MPTCP which doesn't seem to be used here. I'm not sure how I can tell syzbot this is a false positive. Cheers, Matt -- Tessares | Belgium | Hybrid Access Solutions www.tessares.net