[GHC] #12521: Thread blocked indefinitely in an MVar operation

[GHC]

#12521: Thread blocked indefinitely in an MVar operation
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           Reporter:                 |             Owner:
  SwiftsNamesake                     |
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  7.8.4
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:  x86_64         |   Type of failure:  GHCi crash
  (amd64)                            |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 {{{#!hs
 C:\Users\Jonatan>ghci
 GHCi, version 7.8.3: http://www.haskell.org/ghc/  :? for help
 Loading package ghc-prim ... linking ... done.
 Loading package integer-gmp ... linking ... done.
 Loading package base ... linking ... done.
 λ> putStrLn
 "\35753Haskell\25110\32773Ghci\33021\27491\30830\26174\31034\27721\23383\24182\19988\35835\21462\27721\23383\21629\21517\30340\25991\26723"
 *** Exception: <stdout>: hPutChar: invalid argument (invalid character)
 λ>
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 λ> chcp 6
 ghc.exe: panic! (the 'impossible' happened)
   (GHC version 7.8.3 for x86_64-unknown-mingw32):
         thread blocked indefinitely in an MVar operation

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12521>
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