[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
      Resolution:              |             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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Description changed by bgamari:

@@ -0,0 +1,1 @@
+ {{{
@@ -10,1 +11,1 @@
- *Main> take 10 (cycle "Hel)
+ *Main> take 10 (cycle "Hel")
@@ -16,0 +17,1 @@
+ }}}

New description:

 {{{
 *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#comment:1>
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