[GHC] #5381: internal error: MVAR_CLEAN on mutable list

[GHC]

#5381: internal error: MVAR_CLEAN on mutable list
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    Reporter:  MikolajKonarski  |        Owner:               
        Type:  bug              |       Status:  new          
    Priority:  normal           |    Milestone:               
   Component:  Compiler         |      Version:  7.3          
    Keywords:  MVAR_CLEAN       |     Testcase:               
   Blockedby:                   |   Difficulty:               
          Os:  Linux            |     Blocking:               
Architecture:  x86_64 (amd64)   |      Failure:  Runtime crash
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Comment(by simonmar):

 Does this occur with 7.2.1RC or just 7.3?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5381#comment:3>
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