[GHC] #8406: Invalid object in isRetainer() or Segfault

[GHC]

#8406: Invalid object in isRetainer() or Segfault
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        Reporter:  crockeea        |                Owner:
            Type:  bug             |               Status:  infoneeded
        Priority:  normal          |            Milestone:
       Component:  Runtime System  |              Version:  7.8.3
      Resolution:                  |             Keywords:
Operating System:  Linux           |         Architecture:  x86_64 (amd64)
 Type of failure:  Runtime crash   |            Test Case:
      Blocked By:                  |             Blocking:
 Related Tickets:                  |  Differential Rev(s):
       Wiki Page:                  |
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Comment (by thomie):

 Thanks, I can reproduce it now.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8406#comment:19>
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