[issue833] cache_lock: blocked on 0xe29c3b08 ""

[David W]

It seems that these sigreturn: eflags messages and subsequent lockups are due to possibly
a bug in qemu (even in the latest CVS sources that I have pulled from 10/30). Upon further
research of these messages it seems VirtualBox is affected and I can only assume qemu is
as well (as VirtualBox is based on qemu). It just so happened that these messages occurred
just after having tried to recreate the issue I was having on my Opteron-based system and the
same sort of effect was generated.

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