page fault in kernel

[Andriy Gapon]

on 27/07/2011 09:39 Tim Newsham said the following:
> I have an amd64 box that is occasionally panic'ing with a kernel
> page fault while the system is under heavy load. 

My personal philosophy is that it is better to gather objective data before
making any speculations:
http://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug.html

> I tried swapping
> out ram and running ram tests and that hasn't seem to turn up
> anything.  I originally saw this with 8.1 but I recently updated to
> 8.2 to be sure and I'm still seeing the problem.  I'm up to date
> with "freebsd-update" and I verified that the core files all match
> the md5 of a clean 8.2 release (after it is also updated).  I also
> tried to disable various frills I had installed (like ip6 tunnel).
> 
> The normal way I repro this issue is to start a "portupgrade -caP"
> going and I usually get a crash within a few hours.  Sometimes
> I see some unusual behavior instead of or right before a crash
> (ie. program segfaults that shouldn't normally).
> 
> Are there any known kernel issues that sound similar to this
> problem?  I've been working under the assumption that this is
> probably hardware related, but I haven't yet ruled out software.
> 
> I'll probably be trying some tests with cpuburn.  Any other advice
> for tracking down this issue would be appreciated.

-- 
Andriy Gapon