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The suggestion of using 2.6.31-10-rt prompted me to give
2.6.32-22-preempt a try.  While I was impressed with how responsive the
desktop seemed with a mix of high CPU load tasks going on in the
background, it still failed the torture test and locked up....  this
time with the return of both the "do_IRQ: 0.177 No irq handler for
vector (irq -1)" and "BUG: soft lockup - CPU#1 stuck for 61s!
[ghb:9719]" just before the freeze.

The system was a little more responsive while it was freezing... I was even able to switch desktops and try other apps.
Firefox, Handbrake and System Monitor locked up right away (grey windows) - I'm guessing they were on CPU 1, the one which experienced the soft lockup.   The desktop CPU load widget showed CPU 1 at 100%  Other apps. seemed okay briefly
but ultimately everything locked solid within a couple of minutes, although I was able to reboot with SysRq+REISUB.

I did get quite a lot of info in kern.log this time... the fun starts at
line 1003.

I'll give 2.6.31-10-rt a try in the next couple of days.

** Attachment added: "kern.log"
   http://launchpadlibrarian.net/49801638/kern.log

-- 
Ubuntu 10.04 random freezes
https://bugs.launchpad.net/bugs/585765
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