I thought I would share this with the list:

If you are seeing double fault OOPS on the host while working with KVM, theres 
a good chance you (or someone else) has tried to sleep while the guest-context 
is still loaded.  Perhaps this is obvious and/or well known to all of you.  But 
the occurrence of this fault left me scratching my head for a few hours until I 
figured this out.  So I thought I would share in the hopes of saving someone 
else wasted time. :)

Regards,
-Greg

PS: KDB is pretty good at ferreting the offending sleep out, but note that your 
call stack will be mostly garbled.  Only the last few frames are real, but they 
usually are enough to lead you to the sleep.  If you backtrack through the 
code, you will probably find you are in a vcpu_load()/vcpu_put() critical 
section on way or another.  This is bad ;)

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