[GHC] #12715: T3994 is intermittently broken on Windows

[GHC]

#12715: T3994 is intermittently broken on Windows
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           Reporter:  bgamari         |             Owner:
               Type:  bug             |            Status:  new
           Priority:  normal          |         Milestone:  8.2.1
          Component:  Test Suite      |           Version:  8.1
           Keywords:                  |  Operating System:  Windows
       Architecture:  x86_64 (amd64)  |   Type of failure:  None/Unknown
          Test Case:                  |        Blocked By:
           Blocking:                  |   Related Tickets:
Differential Rev(s):                  |         Wiki Page:
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 The `T3994` testcase sometimes appears to crash on Windows,
 {{{
 +++ ../../libraries/process/tests/T3994.run/T3994.run.stderr.normalised
 2016-10-16 03:11:54.601205700 +0000
 @@ -0,0 +1,2 @@
 +   1521 [main] sh 5272 child_copy: cygheap read copy failed,
 0x1802FE408..0x180307A08, done 0, windows pid 5272, Win32 error 299
 +   7952 [main] sh 5272 C:/msys64/usr/bin/sh: *** fatal error in forked
 process - ccalloc would have returned NULL

 }}}
 This very well may be an msys issue.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12715>
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