[GHC] #8834: 64-bit windows cabal.exe segfaults in GC

[GHC]

#8834: 64-bit windows cabal.exe segfaults in GC
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        Reporter:  awson          |            Owner:
            Type:  bug            |           Status:  new
        Priority:  highest        |        Milestone:  7.8.1
       Component:  Compiler       |          Version:  7.8.1-rc2
      Resolution:                 |         Keywords:
Operating System:  Windows        |     Architecture:  x86_64 (amd64)
 Type of failure:  Runtime crash  |       Difficulty:  Unknown
       Test Case:                 |       Blocked By:
        Blocking:                 |  Related Tickets:
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Comment (by thoughtpolice):

 I've definitely managed to reproduce this finally after a bunch of hunting
 - it doesn't really seem related to OS version, JUST related to MSYS2.
 #8870 is the same thing, I'm quite certain (failure at `CPSZ` output
 during segfault if you check `-v3`). It just doesn't make sense to me why
 the testsuite runs clean on my machine where I built the bindist, and
 everything works and compiles, but it fails for users and here.

 I'm running the testsuite right now and I can see some isolated failures
 that I'm quite sure are illegitimate (several segfaults), i'll report the
 results here, `./validate` is about half done.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8834#comment:77>
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