I have been having a very similar problem, I am running Ubuntu Studio
and the problem only occurs when I am using realtime kernel, if i boot
using generic kernel then my system stays stable, but when I boot using
RT kernel, my system will go very weird after 1 minute - 12 hours. It
looks like it has unmounted all the drives and complains of read/write
errors for even commands like 'ls /'  pressing ctrl+alt+backspace or
ctrl+alt+delete do nohting, GUI stops responding although the  mouse
pointer usually still moves and the only solution is to reset.

Attached is kern.log of last time i booted to RT kernel, problem becomes
evident at 21:00 on May 17th.

I have formatted all disks, checked them and reinstalled and the problem
persists, I have also installed smart-tools and done a full smart check
on all 4 disks. As I said, generic kernel runs sweet as a nut, as do
generic kernel and RT kernel under Gutsy. FWIW, I am using a raid 0+1
array on nvidia raid using dmraid.

** Attachment added: "kern.log showing disk issues"
   http://launchpadlibrarian.net/14631425/kern.log-disk-problem

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Hardy crashes - requires hard reset
https://bugs.launchpad.net/bugs/229159
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