Crafty crashes AMD64 system

Binary package hint: crafty

Problem:
Crafty 20.14 will hang my system when performing at a search depth of roughly 13 or more, forcing me to do a hard reboot. In a nutshell, setting mt=1 in /etc/crafty.rc makes crafty angry; mt=2 makes crafty violent. mt=1 will cause crafty to crash only if i multi-task with non-crafty related programs (firefox, audacious, etc). mt=2 removes all hope and just locks up the system.

ubuntu release:
Ubuntu 8.10 (Linux ubuntu 2.6.27-9-generic #1 SMP Thu Nov 20 22:15:32 UTC 2008 x86_64 GNU/Linux)

package release:
crafty:
  Installed: 20.14-1
  Candidate: 20.14-1
  Version table:
 *** 20.14-1 0
        500 http://us.archive.ubuntu.com intrepid/multiverse Packages
        100 /var/lib/dpkg/status

hardware:
MSI GX630 laptop
4 gigs of memory
AMD Athlon(TM) X2 Dual-Core QL-62 2.0GHz
(http://global.msi.com.tw/index.php?func=proddesc&prod_no=1513)

notes:
1. i increased shmmax to 1000000000 to accomodate large hash tables. default is only like 32 megs.
2. exact same install of Ubuntu as 32-bit has no problems whatsoever with the exact same crafty.rc, although i set shmmax to 500000000 instead on the 32-bit install.
3. Trying to compile the source for crafty i get error: too many arguments to function ‘numa_node_to_cpus’, but if i edit out -DNUMA from Makefile for -linux-amd64, it compiles. I just get no SMP function =(
4. problem exists with both 64-bit kernels, 2.6.27-7 and 2.6.27-9
5. i suspect it has to deal with -DNUMA.

benb@ubuntu:~$ cat /etc/crafty.rc
ponder on
book on
learn 7
hash=600m
hashp=200m
egtb
cache=64m
swindle on
mt=2
exit
benb@ubuntu:~$ cat /proc/sys/kernel/shmmax
1000000000
benb@ubuntu:~$ crafty

Machine is NUMA, 1 nodes (2 cpus/node)

pondering enabled.
book learning enabled
result learning enabled
position learning enabled
hash table memory = 384M bytes.
pawn hash table memory = 128M bytes.
EGTB access enabled
using tbpath=/var/lib/crafty/TB
0 piece tablebase files found
EGTB cache memory = 64M bytes.
max threads set to 2

Crafty v20.14 (2 cpus)

White(1):