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Re: [Xen-devel] Dom0 crash when DomU maxmem specified

To: James Harper <james.harper@xxxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Dom0 crash when DomU maxmem specified
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Sat, 04 Jul 2009 13:57:09 +0100
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Thread-topic: [Xen-devel] Dom0 crash when DomU maxmem specified
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Backtrace from Xen or dom0. There probably will be one.

 -- Keir

On 04/07/2009 12:32, "James Harper" <james.harper@xxxxxxxxxxxxxxxx> wrote:

> It looks like suddenly the machine won't talk to me anymore :)
> Not much use sorry. I'm at home (flu) and the machine is at work. What sort of
> info do you need?
> James
> -----Original Message-----
> From: "Keir Fraser"<keir.fraser@xxxxxxxxxxxxx>
> Sent: 4/07/09 8:59:37 PM
> To: "James Harper"<james.harper@xxxxxxxxxxxxxxxx>,
> "xen-devel@xxxxxxxxxxxxxxxxxxx"<xen-devel@xxxxxxxxxxxxxxxxxxx>
> Subject: Re: [Xen-devel] Dom0 crash when DomU maxmem specified
> On 04/07/2009 11:22, "James Harper" <james.harper@xxxxxxxxxxxxxxxx> wrote:
>> I have a windows DomU with memory=768 and maxmem=5120, I just noticed
>> that since upgrading to 3.4.1-rc5 that Windows thinks it has 5G of
>> memory, while 'xm list' says it only has 768M and 'xm info' roughly
>> matches (eg 8G physical memory, 5G remaining, 3G used by various
>> DomU's).
>> I then ran a few things in my DomU to see what would happen when it
>> tried to use more than 768M of memory and unexpectedly, the entire Dom0
>> crashed.
>> This worked as expected under 3.3.x
> It probably has something to do with the populate-on-demand memory support
> for HVM guests that was introduced in Xen 3.4. What does the dom0 crash look
> like?
>  -- Keir

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