[GHC] #12728: setnumcapabilities001 sometimes fails on Windows

[GHC]

#12728: setnumcapabilities001 sometimes fails on Windows
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        Reporter:  bgamari         |                Owner:
            Type:  bug             |               Status:  new
        Priority:  high            |            Milestone:  8.2.1
       Component:  Runtime System  |              Version:  8.0.1
      Resolution:                  |             Keywords:
Operating System:  Windows         |         Architecture:  x86_64 (amd64)
 Type of failure:  Runtime crash   |            Test Case:
      Blocked By:                  |             Blocking:
 Related Tickets:                  |  Differential Rev(s):
       Wiki Page:                  |
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Description changed by bgamari:

@@ -4,1 +4,5 @@
- is to blame in this particular case.
+ is to blame in this particular case,
+ {{{
+ setnumcapabilities001.exe: internal error: ASSERTION FAILED: file
+ rts\Schedule.c, line 1636
+ }}}

New description:

 I have seen the `setnumcapabilities001` test fail at least once on Windows
 ([[https://phabricator.haskell.org/harbormaster/build/14178/?l=0]]). It
 seems that the assertion `ASSERT(n_idle == 0);` in `Schedule.scheduleDoGC`
 is to blame in this particular case,
 {{{
 setnumcapabilities001.exe: internal error: ASSERTION FAILED: file
 rts\Schedule.c, line 1636
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12728#comment:1>
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