[GHC] #8720: ghc crash

[GHC]

#8720: ghc crash
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        Reporter:  guest  |            Owner:
            Type:  bug    |           Status:  new
        Priority:         |        Milestone:
  normal                  |          Version:  7.6.3
       Component:  GHCi   |         Keywords:  ghci crash mvar thread block
      Resolution:         |     Architecture:  x86_64 (amd64)
Operating System:         |       Difficulty:  Unknown
  Windows                 |       Blocked By:
 Type of failure:  GHCi   |  Related Tickets:
  crash                   |
       Test Case:         |
        Blocking:         |
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Comment (by Fuuzetsu):

 You should probably say what you were doing when it happened.

 Also looks like a duplicate of #4245

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8720#comment:1>
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