Let's not forget that the problem is a sig12(kernel page fault), not the lack of a coredump.
The usual suspects:
1. memory faults
2. Binary kernel modules (nvidia/ltmdm etc)
3. Bugs in kernel code (very unlikely)
Getting a dump will help track down 2 & 3, and that memory test _should_ rule out #1.
If you do have any kernel modules from ports, make sure you rebuild them every time you upgrade the kernel.
RE: the dumps:
I was of the impression that, if swap and /var/crash were big enough, dumpon and savecore would be run automagically by their respective rc.d scripts (/etc/rc.d/dumpon and /etc/rc.d/savecore), but this might not be the case in 6.x.
Check your dmesg (or /var/log/messages) for comments on savecore and dumpon, and check /etc/defaults/rc.conf for variables controlling them (put any changes in /etc/rc.conf, of course (sorry if you didn't need that reminder!)).
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