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Date:   Tue, 21 Aug 2018 18:42:44 +0200
From:   Paolo Bonzini <>
To:     Dmitry Vyukov <>
Cc:     syzbot <>,
        "H. Peter Anvin" <>, KVM list <>,
        LKML <>,
        Ingo Molnar <>,
        Radim Krčmář <>,
        syzkaller-bugs <>,
        Thomas Gleixner <>,
        the arch/x86 maintainers <>
Subject: Re: WARNING in free_loaded_vmcs (2)

On 14/08/2018 22:41, Dmitry Vyukov wrote:
> On Tue, Aug 14, 2018 at 10:16 AM, Paolo Bonzini <> wrote:
>> Is there anything that was changed in syzkaller and is causing it to
>> find all these bugs?
> Nothing has changed on syzkaller side as far as I can tell.

And the failures started to appear on 20180806 when I did the big KVM
update from 85eae57bbb0612387201635659be543aaac2109e to

They all seem related to some use-after-free on exit, and there is a
reproducer at,
but it doesn't immediately cause the failure for me.


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