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SubjectRe: WARNING in vcpu_enter_guest
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syzbot has bisected this bug to:

commit 9446e6fce0ab9dfd44b96f630b4e3a0a0ab879fd
Author: Paolo Bonzini <pbonzini@redhat.com>
Date: Wed Feb 12 12:27:10 2020 +0000

KVM: x86: fix WARN_ON check of an unsigned less than zero

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1744891de00000
start commit: 5076190d mm: slub: be more careful about the double cmpxch..
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=14c4891de00000
console output: https://syzkaller.appspot.com/x/log.txt?x=10c4891de00000
kernel config: https://syzkaller.appspot.com/x/.config?x=9f894bd92023de02
dashboard link: https://syzkaller.appspot.com/bug?extid=00be5da1d75f1cc95f6b
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10bb4023e00000

Reported-by: syzbot+00be5da1d75f1cc95f6b@syzkaller.appspotmail.com
Fixes: 9446e6fce0ab ("KVM: x86: fix WARN_ON check of an unsigned less than zero")

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

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