[GHC] #5909: Segfault with multi-threaded retainer profiling

[GHC]

#5909: Segfault with multi-threaded retainer profiling
-------------------------------+--------------------------------------------
    Reporter:  akio            |       Owner:  simonmar     
        Type:  bug             |      Status:  patch        
    Priority:  high            |   Milestone:  7.6.2        
   Component:  Runtime System  |     Version:  7.4.1        
    Keywords:                  |          Os:  Linux        
Architecture:  x86_64 (amd64)  |     Failure:  Runtime crash
  Difficulty:  Unknown         |    Testcase:               
   Blockedby:                  |    Blocking:               
     Related:                  |  
-------------------------------+--------------------------------------------

Comment(by simonmar):

 Interesting, thanks for the patch, I'll take a look.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5909#comment:8>
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