Squid 2.0Patch2 dying under HPUX11.0

I'm running squid 2.0patch2 under HPUX 11.0, and when it stays up, it's
great. The problem is that under any measurable load, it dies with the
following error(from cache.log):

FATAL: xcalloc: Unable to allocate 4096 blocks of 1 bytes!

The preceeding message doesn't seem to be the same, or even close. Trying
to compile with the xmalloc-debug enabled configs fine, but won't compile.
For that matter, the dlmalloc stuff won't compile either.

Has anyone seen this?

-- 
mat.