Eskinews was complaining about corrupted page table entries. This isn't particularly suprising because there are race conditions on SMP platforms under Linux that aren't fixed, but they usually cause spin_lock deadlock instead of table corruption. At any rate, if I see those on a box I know it will become unstable, because you've got memory pages allocated to more than one process or not at all which is a bad thing. So I attempted to gracefully boot the machine before it crashed, unfortunately it did not gracefully halt. But here is where it gets weird. When I tried to reboot, it would hang when it tried to mount the root partition read/write. I could mount it read only, I could mount any other partition read/write. Fsck could not find anything wrong. I went in and snooped around with debugfs, couldn't see anything, and a few other tools. In short I figured there must be SOMETHING wrong with the root file system and that the tools couldn't detect but none-the-less prevented a mount from completing. It did not print any error messages or other clues. So, I tried to steal a swap partition to make a new root partition, and when I did, it too hung when it tried to mount read/write. In January, I had upgraded the disk utils on this machine, which included a new mount command. Just for kicks I tried the old mount command, it worked! So I put the old mount command back, but I am mystified because I've booted the machine half a dozen times probably since I upgraded the disk utils and this is the first time it's ever displayed this behavior. Now the machine has to run an fsck on all the partitions, and the spool partition takes about two hours. Once that is done this should be back up. As soon as I can port the authentication utility to Redhat 6.1 we should be able to bring up the new CPU, and the race conditions present in the SMP kernel will no longer cause this instability. I gotta say though this one really has me miffed; why mount would work half a dozen times and then suddenly refuse to function and only on the root partition. Too weird, makes no sense.