linux-kernel - Re: kvm splat in mmu_spte_clear_track

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Date:   Mon, 28 Aug 2017 18:17:38 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Bernhard Held <berny156@....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 Mon, 28 Aug 2017 18:07:37 +0200,
Bernhard Held wrote:
> 
> 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.

OK, thanks, it's good to know.
Unfortunately I have no Windows on my machine, so it doesn't work for
me ;)  But it implies that rather the workload in VM is likely more
essential than the workload on host.


Takashi