[GHC] #11591: thread blocked indefinitely in an MVar operation

[GHC]

#11591: thread blocked indefinitely in an MVar operation
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           Reporter:  PaulNibin       |             Owner:
               Type:  bug             |            Status:  new
           Priority:  normal          |         Milestone:
          Component:  Compiler        |           Version:  7.10.3
           Keywords:                  |  Operating System:  Windows
       Architecture:  x86_64 (amd64)  |   Type of failure:  GHCi crash
          Test Case:                  |        Blocked By:
           Blocking:                  |   Related Tickets:
Differential Rev(s):                  |         Wiki Page:
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 *Main> take 24 [13,26..]
 [13,26,39,52,65,78,91,104,117,130,143,156,169,182,195,208,221,234,247,260,273,286,299,312]
 *Main> cycle [1,2,3]
 [1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,
 *Main>
 *Main>
 *Main>
 *Main> take 10 (cycle [1,2,3])
 [1,2,3,1,2,3,1,2,3,1]
 *Main> take 10 (cycle "Hel)
 ghc.exe: panic! (the 'impossible' happened)
   (GHC version 7.10.3 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/11591>
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