[GHC] #10860: The test `setnumcapabilities001` sometimes fails on Phabricator

[GHC]

#10860: The test `setnumcapabilities001` sometimes fails on Phabricator
-------------------------------------+-------------------------------------
              Reporter:  thomie      |             Owner:  simonmar
                  Type:  bug         |            Status:  new
              Priority:  high        |         Milestone:  7.12.1
             Component:  Runtime     |           Version:  7.10.2
  System                             |
              Keywords:              |  Operating System:  Unknown/Multiple
          Architecture:              |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
             Test Case:              |        Blocked By:
              Blocking:              |   Related Tickets:
Differential Revisions:              |
-------------------------------------+-------------------------------------
 {{{
 setnumcapabilities001: internal error: ASSERTION FAILED: file
 rts/Schedule.c, line 406
 }}}
 https://phabricator.haskell.org/harbormaster/build/5890/


 Here it just timed out:
 https://phabricator.haskell.org/harbormaster/build/5904/?l=0

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10860>
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