6.0 hangs (while building OOo)

This happened twice already -- I rebuilt the kernel after the first
time. I'm currently running

	FreeBSD 6.0-BETA5 #7: Mon Oct  3 19:10:37 EDT 2005

This is a dual Xeon-PII _at_450MHz with 512Mb of memory.

The OOo build progresses until it gets stuck on something like:

	if ( -e ../../../unxfbsd.pro/slo/provider.o) touch ../../../unxfbsd.pro/slo/provider.obj

According to Ctrl-T, the active process is:

	load: 0.00  cmd: perl5.8.7 64983 [runnable] 0.00u 0.01s 0% 4868k

but the machine is 100% idle. The build itself can be interrupted
with Ctrl-C, but the subsequent access to the work-directory
will somewhere. The first time `rm -rf' got hung. Now
`find work/ -name provider.o' is hanging (after displaying
work/OOo_2.0beta2/configmgr/unxfbsd.pro/slo/provider.o).

The machine is otherwise usable. When rebooted after the first time
this happened, the reboot hung too -- I had to cold-reset it and the
filesystem hosting /usr/ports had to be fsck-ed.

This last build log can be found at:

	http://aldan.algebra.com:8015/~mi/ooo-2.0-build.log.bz2

but I doubt, it is OOo-specific, although other heavy ports (like
firefox or jdk14) built fine.

	-mi