[GHC] #12117: Thread by forkIO freezes (while read :: Int if error appears) when compiled with -threaded option

[GHC]

#12117: Thread by forkIO freezes (while read :: Int if error appears) when compiled
with -threaded option
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        Reporter:  wapxmas       |                Owner:
            Type:  bug           |               Status:  new
        Priority:  normal        |            Milestone:
       Component:  Compiler      |              Version:  7.10.3
      Resolution:                |             Keywords:  -threaded, freeze
Operating System:  Windows       |         Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:                |  Differential Rev(s):
       Wiki Page:                |
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Comment (by wapxmas):

 If uncomment line 33 in "concbug.hs" and comment line 34 then with or
 without -threaded option promram works as expected without hangs and
 freezes.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12117#comment:1>
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