[GHC] #3875: DPH QuickHull example crashes on SPARC with -N > 1

[GHC]

#3875: DPH QuickHull example crashes on SPARC with -N > 1
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    Reporter:  benl     |       Owner:  benl         
        Type:  bug      |      Status:  assigned     
    Priority:  normal   |   Component:  Compiler     
     Version:  6.13     |    Keywords:               
          Os:  Solaris  |    Testcase:               
Architecture:  sparc    |     Failure:  Runtime crash
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Comment(by benl):

 Sadly, compiling with `-debug` and running the same program with `+RTS
 -Dg` makes it work. Heisenbugs are my least favourite.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3875#comment:2>
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