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Re: [Xen-devel] segfault in VM

On Jul 19, 2004, at 3:27 AM, 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'll be building Xen on a non-SMP box I also have at home tonight, with any luck.

I'll also be running memtest on the SMP box that's been seeing the corruption when I get home as well, probably followed by CTCS. It was stable for a week or so under reasonably heavy load before I installed Xen on it, but you never know...

If it passes all the testing, I'll build a 2.6.7 guest kernel and give that a try.

"I think that's what they mean by   |
"nickels a day can feed a child."   |       http://www.eff.org/
I thought, "How can food be so      | http://www.anti-dmca.org/
cheap over there?"  It's not, they  |--------------------------
just eat the nickels." -- Peter Nguyen

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