[GHC] #4533: IO manager can leak MVars if threads are killed

[GHC]

#4533: IO manager can leak MVars if threads are killed
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    Reporter:  bos               |        Owner:  bos                        
        Type:  bug               |       Status:  patch                      
    Priority:  normal            |    Milestone:                             
   Component:  Runtime System    |      Version:  7.0.1                      
    Keywords:                    |     Testcase:                             
   Blockedby:                    |   Difficulty:                             
          Os:  Unknown/Multiple  |     Blocking:                             
Architecture:  Unknown/Multiple  |      Failure:  Incorrect result at runtime
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Comment(by bos):

 I've attached the final fix to #4514 as
 [http://hackage.haskell.org/trac/ghc/attachment/ticket/4514/base-4514%2B4533.dpatch
 base-4514+4533.dpatch].

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4533#comment:10>
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