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[Ewan Mellor <609749@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

The singleton logic in nova.process is broken, causing this assertion to
be hit:

DEBUG:root:Someone released me too many times: too many tokens!

The problem is that the override of SharedPool.__new__  doesn't stop
ProcessPool.__init__ from being run whenever process.simple_execute is
called.  When __init__ runs for the second time, the DeferredSemaphore
is replaced.  This means that as soon as you have more than one Deferred
running at the same time, you end up releasing a different semaphore to
the one that you acquired.

** Affects: nova
     Importance: Undecided
     Assignee: Ewan Mellor (ewanmellor)
         Status: In Progress

** Changed in: nova
       Status: New => In Progress

** Changed in: nova
     Assignee: (unassigned) => Ewan Mellor (ewanmellor)

-- 
nova.process singleton isn't working, causing "Someone released me too many times: too many tokens!" assertion
https://bugs.launchpad.net/bugs/609749
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