>From this stack trace and the dmesg it appears that this is happening when a 
>CF device is being scanned thru a usb->cf adaptor.  The oops is due to 
an attempt to list_del_init dev->power.entry when it is null.

What was going on at this time?  Was there a CF card in the slot?  If there was
a CF card, was it there through the boot and/or was it inserted/removed 
later?  Is this repeatable?
What happens if the system is booted with maxcpus=0 or 1?

-- 
USB stops working after a while
https://bugs.launchpad.net/bugs/228746
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