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Pausing before hibernating doesn't help either.
http://forums.virtualbox.org/viewtopic.php?f=7&t=26622
Disabling Vt-x extension solved it.
I'm not sure about the performance impact. But so far, it isn't noticeable.
From what I've read, Vt-x with nested paging can potentially improve performance dramatically. But at this point, reports to the contrary do exist.
Hope this helps anyone facing a similar issue.
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