The seg faults are only in domU - dom0 is fine (as I said, I ran 
memtester in dom0 with no problems).

Keir Fraser asked me to try passing "no-tmem" as a boot parameter to the 
hypervisor but that didn't stop the memory corruption.

I only have one memory module (nothing to swap) and given that it's fine 
under Xen 3.4.2 it looks likely to be a software-only problem (esp. as 
repeated memtest86 runs yield no faults).

I have an Intel Core i3 530, which has "onboard" graphics (which I use). 
I also have the Asus P7H55M-Pro motherboard.

Thanks,
Yasir
> On Fri, Feb 05, 2010 at 04:42:16PM +1100, Yasir Assam wrote:
>    
>> I think I've narrowed down my random crashes to Xen 4.0.0 rc2 causing
>> memory corruption in domUs.
>>
>> Xen 3.4.2 is ok, and it doesn't seem to matter which domU or dom0 kernel
>> I'm using.
>>
>> I have two domUs, both PV
>>
>> * 2.6.32.7 from kernel.org
>> * 2.6.18-xen
>>
>> Everything is 64-bit.
>>
>> The random segfaults I was getting looked like bad RAM, but memtest86
>>      
> These segfaults - were they in dom0 or domU? What CPU do you have?
> AMD/Intel?
>
> Did you try to swap the memory modules when you were trying to narrow
> this down?
>
>    
>> didn't report any problems. So I ran memtester
>> (http://pyropus.ca/software/memtester/), a userspace mem test app.
>>
>> When I ran memtester on the dom0 (assigning all available RAM to the
>> dom0) there was no problem. However, when I ran it against either of the
>> domUs, it reported problems with RAM. See memtester output below. The
>> corruption starts at around address 0x02404900.
>>
>> Uninstalling 4.0 rc2 and installing 3.4.2 got rid of the problem, so it
>> looks like 4.0.0 rc2 could be the problem, rather than any of the
>> kernels or the hardware.
>>      
> Did you compile 4.0.0-rc2 with debug=y?
>
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