Re: [Xen-devel] xenstored crashes with SIGSEGV

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2014-12-15 at 23:29 +0100, Philipp Hahn wrote:
> > I notice in your bugzilla (for a different occurrence, I think):
> >> [2090451.721705] univention-conf[2512]: segfault at ff00000000 ip 
> >> 000000000045e238 sp 00007ffff68dfa30 error 6 in python2.6[400000+21e000]
> > 
> > Which appears to have faulted access 0xff000000000 too. It looks like
> > this process is a python thing, it's nothing to do with xenstored I
> > assume?
> 
> Yes, that's one univention-config, which is completely independent of
> xen(stored).
> 
> > It seems rather coincidental that it should be accessing the 
> > same sort of address and be faulting.
> 
> Yes, good catch. I'll have another look at those core dumps.

With this in mind, please can you confirm what model of machines you've
seen this on, and in particular whether they are all the same class of
machine or whether they are significantly different.

The reason being that randomly placed 0xff values in a field of 0x00
could possibly indicate hardware (e.g. a GPU) DMAing over the wrong
memory pages.

Ian.


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