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I had 3 freezes yesterday.  In each case the last entry in kern.log was:

do_IRQ: 0.189 No irq handler for vector (irq -1)
(Sometimes the number is 0.175, 0.177).

(Interestingly, there have been no instances of the "BUG: CPU soft
lockup" messages in the last two days.

I ran a memory test overnight and it was clean.

I also tested kernel 2.6.31-02063112-generic, 2.6.34-020634-generic,
2.6.35-020635rc1-generic today.  All of these froze.

In exasperation, I booted this morning with "noapic nolapic acpi=off" on
the grub kernel parameters with current 2.6.32-22-generic.  This
disables all power management (as I understand it), such that my system
is running full-out all the time.

The system has been running solid ever since.  Even with torture testing
it with a DVD rip in Handbrake, Virtualbox, MythTV recording and
commercial flagging, an h264 transcode, and Amarok playing.... all
running simultaneously.   The DVD rip alone would have been enough to
lock the system up within a few minutes without "noapic nolapic
acpi=off".

This is not desirable work-around, or a long-term solution, but it at
least lets me work for the moment, and allows me to continue helping
debug rather than reverting back to karmic.

To re-iterated: this system has been working fine for over a year with
karmic and jaunty, with power management.  This is a regression with
Lucid, and the issue is present with upstream kernels as well.

It would be very nice if someone could assign a more appropriate "High
Priority" to this issue and we could get some attention from some devs
before this bug report becomes a confused with too many un-related
freezes.

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