[GHC] #4265: Sanity bug found by +RTS -DS in Agda

[GHC]

#4265: Sanity bug found by +RTS -DS in Agda
-------------------------------+--------------------------------------------
    Reporter:  wkahl           |        Owner:  simonmar     
        Type:  bug             |       Status:  new          
    Priority:  highest         |    Milestone:  6.14.1       
   Component:  Runtime System  |      Version:  6.13         
    Keywords:                  |     Testcase:               
   Blockedby:                  |   Difficulty:               
          Os:  Linux           |     Blocking:               
Architecture:  x86_64 (amd64)  |      Failure:  Runtime crash
-------------------------------+--------------------------------------------
Changes (by simonmar):

  * owner:  => simonmar


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4265#comment:8>
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