[GHC] #12419: Scheduling bug with forkOS + MVar

[GHC]

#12419: Scheduling bug with forkOS + MVar
-------------------------------------+-------------------------------------
        Reporter:  luisgabriel       |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.0.2
       Component:  Runtime System    |              Version:  8.0.1
      Resolution:                    |             Keywords:  forkOS;
                                     |  scheduler
Operating System:  Linux             |         Architecture:  x86_64
                                     |  (amd64)
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |  Phab:D2430,Phab:2441
-------------------------------------+-------------------------------------
Changes (by simonmar):

 * status:  merge => new
 * differential:  Phab:D2430 => Phab:D2430,Phab:2441


Comment:

 Please don't merge this yet, there's another fix incoming.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12419#comment:8>
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