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I had a freeze during the night, with the last message that was written
kern.log:

Jun  3 01:21:47 family kernel: [13403.676449] do_IRQ: 0.177 No irq
handler for vector (irq -1)

Examining the log more closely, I've had four freezes in the last 24
hours...  in each case, there are between 1 and 4 incidents of "No irq
handler for vector (irq -1)" in the log just before the freeze.  In one
case, the message was followed by the "CPU soft lockup" message just
before the freeze.

However, there are a few incidents of "No irq handler for vector (irq
-1)" which did not result in a freeze.   And, I've had freezes just
after the the "CPU soft lockup" message, where the "No irq handler"
message didn't appear.

So, while neither "No irq handler" nor the "CPU soft lockup" message may
be the smoking gun, there is at least the stench of gunpowder nearby.

This is back on the current lucid kernel 2.6.32-22-generic.

** Attachment added: "kern.log"
   http://launchpadlibrarian.net/49610911/kern.log

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