linux-kernel - Re: kvm splat in mmu_spte_clear_track

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Message-ID: <c709fc41-a15b-2fbb-218a-9e7b8dc33708@gmx.de>
Date:   Mon, 28 Aug 2017 18:07:37 +0200
From:   Bernhard Held <berny156@....de>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Adam Borowski <kilobyte@...band.pl>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Wanpeng Li <kernellwp@...il.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        kvm <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: kvm splat in mmu_spte_clear_track_bits

On 08/28/2017 at 06:01 PM, Takashi Iwai wrote:
> On Mon, 28 Aug 2017 17:26:05 +0200,
> Bernhard Held wrote:
>> I get crashes with Win10 in kvm
>>
> Did you get the crash reliably?
> I've been struggling how to trigger it efficiently, but currently in
> vain.  The memory pressure isn't a single key to trigger it, as it
> seems...

Yes, I get the crash pretty reliable with Win10 in kvm after 10 to 30 minutes. Some workload in Windows seems to be necessary to trigger the bug.