[GHC] #12038: Shutdown interacts badly with requestSync()

[GHC]

#12038: Shutdown interacts badly with requestSync()
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        Reporter:  simonmar          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Runtime System    |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 I've still seen failures of `setnumcapabilities001` since comment:3 was
 pushed.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12038#comment:6>
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