Public bug reported:

Binary package hint: linux-image-2.6.20-15-generic

With a degraded RAID 5 array, certain I/O loads and the CFQ scheduler
selected, a kernel panic results after a period of time (<30 mins),
locking up the system hard.

The kernel panic (only visible when X is not started) shows the bug is
in the CFQ scheduler.  I believe it's this bug here, fixed in 2.6.21:

http://www.mail-archive.com/[EMAIL PROTECTED]/msg147310.html

Workaround:

Change to Anticipatory scheduler

Fix:

Possibly the patch shown in that document; I have not yet tested it.

I can attach a photo of the panic on request.

** Affects: linux-source-2.6.20 (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

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2.6.20-15-generic kernel panic, cfq scheduler
https://bugs.launchpad.net/bugs/117227
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