[GHC] #4820: "Invalid object in isRetainer" when doing retainer profiling in GHC 7 branch

[GHC]

#4820: "Invalid object in isRetainer" when doing retainer profiling in GHC 7
branch
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        Reporter:  dleuschner     |                Owner:
            Type:  bug            |               Status:  new
        Priority:  highest        |            Milestone:  8.0.2
       Component:  Profiling      |              Version:  8.0.1
      Resolution:                 |             Keywords:
Operating System:  MacOS X        |         Architecture:  x86_64 (amd64)
 Type of failure:  Runtime crash  |            Test Case:
      Blocked By:                 |             Blocking:
 Related Tickets:  #11978         |  Differential Rev(s):
       Wiki Page:                 |
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Comment (by carter):

 if i change the RTS options to set a larger retainer size, eg -R50 or even
 -R500, the shake test suite makes more progress before crashing.
 (in the context of the reproducing steps i describe in #11978)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4820#comment:9>
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