[GHC] #16065: Stack squeezing during context switches makes for non-determinism in allocations

[GHC]

#16065: Stack squeezing during context switches makes for non-determinism in
allocations
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        Reporter:  sgraf             |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  ⊥
       Component:  Runtime System    |              Version:  8.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #4450, #8861      |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonmar):

 Ah, I just realised what causes the allocation: if we *don't* do stack
 squeezing, then the larger stack size means that we might overflow the
 stack in the future, which will entail allocating for the new stack chunk.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16065#comment:2>
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