[GHC] #5859: unsafeInterleaveIO duplicates computation when evaluated by multiple threads

[GHC]

#5859: unsafeInterleaveIO duplicates computation when evaluated by multiple
threads
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    Reporter:  joeyadams         |       Owner:  simonpj                    
        Type:  bug               |      Status:  new                        
    Priority:  high              |   Milestone:  7.4.2                      
   Component:  libraries/base    |     Version:  7.2.2                      
    Keywords:                    |          Os:  Unknown/Multiple           
Architecture:  Unknown/Multiple  |     Failure:  Incorrect result at runtime
  Difficulty:  Unknown           |    Testcase:                             
   Blockedby:                    |    Blocking:                             
     Related:                    |  
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Comment(by simonpj):

 Cf #5943

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5859#comment:6>
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