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

[GHC]

#12038: Shutdown interacts badly with requestSync()
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        Reporter:  simonmar          |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       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:  #5553             |  Differential Rev(s):  Phab:D2926
       Wiki Page:                    |
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Comment (by dfeuer):

 Well, I guess not the ''fix'' for this, but Ben's patch.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12038#comment:19>
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