Re: Kernel Panic - 2.6.23-rc4-mm1 ia64 - was Re: Update: [Automatic] NUMA replicated pagecache ...

[Lee Schermerhorn <Lee.Schermerhorn@hp.com>]

On Wed, 2007-09-12 at 16:41 +0100, Andy Whitcroft wrote:
> On Wed, Sep 12, 2007 at 11:09:47AM -0400, Lee Schermerhorn wrote:
> 
> > > Interesting, I don't see a memory controller function in the stack
> > > trace, but I'll double check to see if I can find some silly race
> > > condition in there.
> > 
> > right.  I noticed that after I sent the mail.  
> > 
> > Also, config available at:
> > http://free.linux.hp.com/~lts/Temp/config-2.6.23-rc4-mm1-gwydyr-nomemcont
> 
> Be interested to know the outcome of any bisect you do.  Given its
> tripping in reclaim.

FYI:  doesn't seem to fail with 23-rc6.  

> 
> What size of box is this?  Wondering if we have anything big enough to
> test with.

This is a 16-cpu, 4-node, 32GB HP rx8620.  The test load that I'm
running is Dave Anderson's "usex" with a custom test script that runs:

5 built-in usex IO tests to a separate file system on a SCSI disk.
1 built-in usex IO rate test -- to/from same disk/fs.
1 POV ray tracing app--just because I had it :-)
1 script that does "find / -type f | xargs strings >/dev/null" to
pollute the page cache.
2 memtoy scripts to allocate various size anon segments--up to 20GB--
and mlock() them down to force reclaim.
1 32-way parallel kernel build
3 1GB random vm tests
3 1GB sequential vm tests
9 built-in usex "bin" tests--these run a series of programs
from /usr/bin to simulate users doing random things.  Not really random,
tho'.  Just walks a table of commands sequentially.

This load beats up on the system fairly heavily.

I can package up the usex input script and the other associated scripts
that it invokes, if you're interested.  Let me know...

Lee