[CentOS] guest vms crash host systems -- SOLVED

On Wed, Oct 5, 2011 at 10:27 PM, Negative <negativebinomial at gmail.com>wrote:

> On Wed, Oct 5, 2011 at 3:11 PM, Negative <negativebinomial at gmail.com>wrote:
>
>> On Wed, Oct 5, 2011 at 3:06 PM, Negative <negativebinomial at gmail.com>wrote:
>>
>>> On Wed, Oct 5, 2011 at 1:00 PM, <m.roth at 5-cent.us> wrote:
>>>
>>>> Negative wrote:
>>>> > On Wed, Oct 5, 2011 at 11:15 AM, <m.roth at 5-cent.us> wrote:
>>>> > Negative wrote:
>>>> > On Wed, Oct 5, 2011 at 11:15 AM, <m.roth at 5-cent.us> wrote:
>>>> >> Negative wrote:
>>>> <snip>
>>>> >> > I still wonder what is causing this. I couldn't find any mention of
>>>> a
>>>> >> > similar problem, including on my desktop in my office, where I have
>>>> a
>>>> >> > very similar setup, with four kvm guests, two Fedora, one Centos 6
>>>> and
>>>> >> > one Windows XP.
>>>> <snip>
>>>> Do I remember this is 5.7? Look at the announcement that *just* came out
>>>> in the last hour, with the libX11 bugfix.
>>>> <https://rhn.redhat.com/errata/RHBA-2011-1351.html> says "Previously,
>>>> in
>>>> the 64-bit mode, libX11 computed addresses using the 32-bit arithmetic.
>>>> As
>>>> a consequence, under heavy load, applications running in the X
>>>> environment
>>>> terminated unexpectedly. A patch has been provided to address this
>>>> issue,
>>>> and the crashes no longer occur in the described scenario."
>>>>
>>>>       mark
>>>>
>>>>
>> And, Mark, thanks for mentioning it.
>>
>>
>>>
>>> If this isn't my lucky day. RH and Centos solved my problem even before I
>>> defined it.
>>>
>>> I saw the update earlier and didn't dare hope. I updated and it seems to
>>> have solved the issue. On the host machine, I fired up virt-manager, started
>>> the Fedora  guest and it's been up for a half hour.
>>>
>>> Now I, too, can start complaining about Gnome 3. I've read it's like
>>> Windows, but it's the spitting image of the Mac OS.
>>>
>>>
>>>
>>
>
> I spoke too soon. Crashed again after being up for several hours. I'm
> running memtest86 now.
>
>
After memtest found no errors, I gave another shot at looking for a software
reason for the crashes and found the cause.

I hadn't mention that I messed up the bridge setup. I didn't think that
could lock up the host machine, but it did. Once I had the bridge fixed, the
crashing stopped and network has been working on the guest. So it was my bad
there.

I thought that an incorrect network config would only affect networking, but
it was causing a kernel panic.