[GHC] #9741: Interpreter stack checks are not quite right

[GHC]

#9741: Interpreter stack checks are not quite right
-------------------------------------+-------------------------------------
              Reporter:  simonpj     |            Owner:  simonmar
                  Type:  bug         |           Status:  closed
              Priority:  highest     |        Milestone:  7.10.1
             Component:  Compiler    |          Version:  7.8.3
            Resolution:  fixed       |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Changes (by simonmar):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 It turns out that things were working mostly correctly, and there was no
 danger of a segfault.  SpLim has a certain amount of headroom to allow for
 the space needed to save things when a stack check fails, which is why we
 appeared to be going over the limit sometimes.  The assertion was the bug.

 However, I did find some other bugs while tracking this down, the patches
 I committed are:

 83cf31e42e87e93eda3e576bc5935509959c2f49
 4cd277b4dcb91c6c6aa7e071ef0364570566de37
 4cd277b4dcb91c6c6aa7e071ef0364570566de37
 e6b38294512896cf55f2d05d09d742d82313f598
 081ef2fb351831081bf6851fd3907679b1b98405

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9741#comment:3>
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