I just replied to your -questions post. Do you have any core dumps in /var/crash?
Also, check dmesg for information from the reboot.
This sounds like, as another -questions poster said, a filesystem issue. Unfortunately, it may be one that fsck doesn't fix - I had this happen to me (fsck says all is well, but hitting certain places on the FS causes a kernel panic due to a vfs dup alloc.)
Try running a "dmesg |grep -i vfs" and see if it says anything. If not, check out /var/crash.
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