I'll throw in that it is still happening for me.  Before, I was probably 
"lucky" enough to hit the gaps, both in observation and usage.  Same symptoms, 
with or without VMs running, all CFQ scheduling.  Not sure if HDD layout/config 
affects this, but maybe it'll help isolate the problem:
1x Corsair F120 120 GB SSD, primary OS drive
4x Seagate "green" 5900 RPM 2 TB HDD, in 2x 2-disk RAID-1 configuration (mdadm)

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Timer interrupt freezes, system becomes sluggish
https://bugs.launchpad.net/bugs/665796
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