Strange system hangs

[Paul Goyette <paul%whooppee.com@localhost>]

I'm running amd64 -current built from with sources updated on May 30 at 
19:30 UTC...

Every once in a while, my system "locks up".  In all of the instances I 
can remember, I had a "build.sh -j32 release" running.

The system is a dual-Opteron-6xxx (total of 24 cores) with 32GB RAM. 
Since it is my main machine, it is running an Xserver, and that's where 
I'm logged in and working.  Most of the file systems (including all of 
the ones that build.sh would be touching) are on either of two RAID-1 
raidframe, and most of the filesystems are also NFS-exported to several 
other machines.  The filesystems are also WAPBL-enabled.

When the hang occurs, everything in userland freezes.  The X mouse 
pointer no longer moves, keyboard input is ignored, and even an xosview 
totally stops updating.

However, if I log in as root on one of the other machines, I can still 
ping(8) the failed box.

The only recourse when this happens seems to be to reboot the box.  I 
have not figured out any way to drop into ddb nor to get a crash dump.

Anyone got any clues?





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