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

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

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