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RE: [Xen-devel] wget and Zope crashes on post-2.0.6 -testing

To: "Osma Suominen" <osma.suominen@xxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] wget and Zope crashes on post-2.0.6 -testing
From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date: Thu, 2 Jun 2005 14:50:31 +0100
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Thread-index: AcVnXR0m5vo6bArNTBCoc6ycwzBFygAG971Q
Thread-topic: [Xen-devel] wget and Zope crashes on post-2.0.6 -testing
> I reported about time-related problems some days ago, with no replies:
> http://thread.gmane.org/gmane.comp.emulators.xen.devel/10628
> I have problems with e.g. wget and Zope crashing on domU on a 
> recent -testing build. This is on a Debian Sarge system, with 
> kernel and a Xen -testing snapshot from two days 
> ago (2005-05-31). The problems are not as easy to trigger as 
> with earlier versions (e.g. the 2.0.5 demo CD), but they do happen.
> The symptom is that during heavy load, wget crashes with the message
> "acalc_rate: Assertion `msecs >= 0' failed", which probably 
> means that time has stepped backwards (looking at earlier 
> xen-devel posts).

I can't reproduce this wget crash, even running seti@home in the
background as you suggest.
I'm running this in dom0 on an SMP Xeon box.

Are you running NTP on your system? If so, what does "echo peers | ntpq"
show? What happens if you disable it?

Is there anything odd about the system? Is the CPU clock speed correctly

You could try the unstable tree -- it would certainly be interesting to
know if there was a difference. The issue must be really quite specific
to your machine or setup (e.g. the crystal is completely knackered) as
otherwise lots of people would be complaining.


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