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Re: [Xen-users] domu hangs?

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] domu hangs?
From: John McMonagle <johnm@xxxxxxxxxxx>
Date: Thu, 9 Sep 2010 12:56:56 -0500
Cc: George Shuklin <george.shuklin@xxxxxxxxx>
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I just tried on a test domu on one of the problem servers using the same domu 
amd64 kernel.

>>> a=" "*1024*1024*256
>>> b=" "*1024*1024*256
>>> c=" "*1024*1024*256
>>> d=" "*1024*1024*256
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>

Did I do it correctly?
Domu did not crash.
Python did not die but  had the error message above.


On Tuesday 07 September 2010 03:40:01 pm George Shuklin wrote:
> Check memory usage. Some kernels for domU have bug with incorrect free
> memory reporting. In this case in OOM situation kernel become mad and
> killing every process and start to panic. And oom happens not at very
> end of memory, but much early.
> Just try to disable swap in VM and 'eat' memory. I usually use
> interactive python with constructions:
> a=" "*1024*1024*256
> b=" "*1024*1024*128
> c=" "*1024*1024*64, etc... Until OOM happens. If python killed - kernel
> sane. If Something Horrible Happens - buggy kernel.
> F.e. debian xen-686 kernel is buggy, I right now takling with
> maintainers. Gentoo/SUSE kernel is fine with memory but have some issues
> with wallclock.
> В Втр, 07/09/2010 в 15:28 -0500, John McMonagle пишет:
> > I have domu hanging on 3 different pv domus.
> >
> > All are dom0 and domu with Debian lenny.
> > It happens randomly roughly once a month.
> > There are no errors in the logs.
> > Can not ping domu.
> > xm console comes up but is unresponsive.
> > Have tried watch watchdog with softdog bit it does not help.
> > xm shutdown does not work.
> > Have to restart with xm destroy, xm create.
> > All have on_crash    = 'restart'  set.

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