[GHC] #7319: +RTS -xc sometimes results in segfault

[GHC]

#7319: +RTS -xc sometimes results in segfault
---------------------------------+------------------------------------------
    Reporter:  edsko             |       Owner:                  
        Type:  bug               |      Status:  new             
    Priority:  high              |   Milestone:  7.6.2           
   Component:  Runtime System    |     Version:  7.6.1           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Changes (by simonmar):

  * priority:  normal => high
  * difficulty:  => Unknown
  * component:  Compiler => Runtime System
  * milestone:  => 7.6.2


Comment:

 Could you compile with `-debug` and try gdb again please?  You should get
 a more informative backtrace.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7319#comment:2>
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