host double faults under KVM?

host double faults under KVM?

[Gregory Haskins]

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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