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xen-devel
Re: [Xen-devel] Xen 4 rc2: pv domU memory corruption
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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