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SubjectRe: [syzbot] KFENCE: use-after-free in kvm_fastop_exception
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syzbot has bisected this issue to:

commit c4512c63b1193c73b3f09c598a6d0a7f88da1dd8
Author: Matthieu Baerts <matthieu.baerts@tessares.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@syzkaller.appspotmail.com
Fixes: c4512c63b119 ("mptcp: fix 'masking a bool' warning")

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

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