linux-kernel - Re: [syzbot] KFENCE: use-after-free in kvm_fastop

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Message-ID: <00000000000012030e05c9c8bc85@google.com>
Date:   Tue, 17 Aug 2021 15:21:09 -0700
From:   syzbot <syzbot+7b938780d5deeaaf938f@...kaller.appspotmail.com>
To:     davem@...emloft.net, johan.hedberg@...il.com, kuba@...nel.org,
        linux-bluetooth@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, luiz.dentz@...il.com,
        marcel@...tmann.org, mathew.j.martineau@...ux.intel.com,
        matthieu.baerts@...sares.net, netdev@...r.kernel.org,
        pabeni@...hat.com, syzkaller-bugs@...glegroups.com,
        viro@...iv.linux.org.uk
Subject: Re: [syzbot] KFENCE: use-after-free in kvm_fastop_exception

syzbot has bisected this issue to:

commit c4512c63b1193c73b3f09c598a6d0a7f88da1dd8
Author: Matthieu Baerts <matthieu.baerts@...sares.net>
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

Reported-by: syzbot+7b938780d5deeaaf938f@...kaller.appspotmail.com
Fixes: c4512c63b119 ("mptcp: fix 'masking a bool' warning")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection