I am also experiencing crashes related to CPU frequency scaling. I have
a dual core processor (Core 2 Duo E6600) and every time I run a heavy
process the computer freezes once the process is finished and load goes
to zero. If I run e.g. glxgears with nice 19 in the background, this
does not occur. I can also fix this by saying

sudo chmod +s /usr/bin/cpufreq-selector

and setting both cores to "performance" (i.e. full frequency all the
time). This happens both in edgy and feisty. However, one of the first
Feisty alpha kernels did not have this bug. If I remember correctly it
was 2.6.19-7.

My motherboard is Abit AB9 with latest BIOS. I also have another similar
system, but with a different motherboard (Asus Commando). The second
computer does not suffer from this bug.

-- 
CPU frequency scaling causes crash
https://bugs.launchpad.net/bugs/95569
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