Re: [Xen-devel] segfault in VM

[Chris Andrews <chris@xxxxxxxxxx>]

Keir Fraser wrote:
> > Keir Fraser wrote:
> >
> > > Clearly there's some fairly random memory corruption going on, which
> > > then causes segfaults (if the corruption hits code pages) and
> > > filesystem corruption (if the corruption hits buffer-cache pages).
> > >
> >
> > > The "Bailing: not a -ve offset" and "GPF (0004):" messages are almost
> > > certainly just symptoms of executing a corrupted block of code. i.e.,
> > > the bug has already triggered some time ago - probably corrupted a
> > > page of glibc or the kernel.
> > >
> > > It would be interesting to see whether or not this is SMP-related.
> > > It's also interesting that someone said they couldn't reproduce
> > > corruption when using 2.6.7 for the non-privileged guest OSes.
> > I'm seeing this corruption on a single CPU machine, with a single 2.4 
> > guest running but idle. I only ran one 2.6.7 guest, and I didn't give it 
> > any work, but it didn't take any load in the 2.4 guest to provoke problems.
> Do you mean a single 2.4 or 2.6 guest in addition to your 2.4 DOM0?
Yes, that's right. With just the 2.4 domain0 on its own, everything 
seems fine.
Chris.


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