[GHC] #10414: Buggy behavior with threaded runtime (-N1 working, -N2 getting into <<loop>>)

[GHC]

#10414: Buggy behavior with threaded runtime (-N1 working, -N2 getting into
<<loop>>)
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        Reporter:  exio4             |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by simonpj):

 Drat. On further reflection I the cardinality analysis is correct.  So it
 looks as though there is a bug in the runtime system.

 '''Simon M''': might you find time to investigate?  With only two single-
 entry thunks it can't be that hard!

 I have literally no hypothesis for why a single-entry thunk could cause
 `<loop>`.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10414#comment:20>
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