[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:
            Type:  bug                          |  simonpj
        Priority:  high                         |           Status:  new
       Component:  libraries/base               |        Milestone:  7.6.2
      Resolution:                               |          Version:  7.2.2
Operating System:  Unknown/Multiple             |         Keywords:
 Type of failure:  Incorrect result at runtime  |     Architecture:
       Test Case:                               |  Unknown/Multiple
        Blocking:                               |       Difficulty:
                                                |  Unknown
                                                |       Blocked By:
                                                |  Related Tickets:
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Comment (by bgamari):

 Indeed I can't reproduce the bad behavior with 7.6.2 and 7.7 HEAD.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5859#comment:10>
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