Greg KH wrote:
>> dmesg etc looks ok. I'd appreciate it if anyone has any thoughts?
> 
> Nothing has changed in usbfs that might cause this that I know of.  Can
> you use git to bisect what patch caused it?
> 
> thanks,
> 
> greg k-h

And indeed nothing had changed. There was a runaway process using 100% of the
CPU causing the symptoms. After gently bashing my boot scripts around
everything seems to work just fine. So, RC1 seems 100% on my setup.

Sorry for the noise.
David