System lockup when out of space in /usr

[Kris Kennaway]

Norberto Meijome wrote:
> Hi,
> FreeBSD ayiin.octantis.com.au 7.1-PRERELEASE FreeBSD 7.1-PRERELEASE #94: Wed
> Oct 15 09:46:16 EST 2008
> root at ayiin.octantis.com.au:/usr/obj/usr/src/sys/AYIIN  i386
> 
> I've noticed when /usr becomes full (due to a large port build or other
> reasons) that my computer becomes completely locked up - frozen. There is no
> panic or crash, the system starts becoming more and pegged down  - load starts
> to climb, then system blocks intermittently for ever longing periods, load
> climbs over 30.... and it never comes back from locked-land.
> 
> Other than "don't let the system run out of disk space", is there any other fix?

Depends on what the bug is.  See the developers handbook for the next 
steps in getting the debugging information for a developer to analyze.

Kris