[GHC] #15038: Memory Corruption (strange closure type)

[GHC]

#15038: Memory Corruption (strange closure type)
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        Reporter:  andrewthad        |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  highest           |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime crash     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9718             |  Differential Rev(s):  Phab:D4652
       Wiki Page:                    |
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Comment (by osa1):

 I responded in the diff.

 > If we are going to fix #9718, how much of this do we need? Perhaps very
 little?

 I don't think fixing #9718 would fix this bug because this bug happens in
 unarise which happens much later than both TidyPgm and CorePrep. I think
 to avoid this bug we need a way to ensure we don't make things more CAFFY
 after CAFFYness information is calculated in TidyPgm. This includes all
 the Stg-to-Stg transforms (CSE, unarise, perhaps new passes added in the
 future).

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15038#comment:29>
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