[GHC] #10414: Buggy behavior with threaded runtime (-N1 working, -N2 getting into <<loop>>)

[GHC]

#10414: Buggy behavior with threaded runtime (-N1 working, -N2 getting into
<<loop>>)
-------------------------------------+-------------------------------------
        Reporter:  exio4             |                   Owner:
            Type:  bug               |                  Status:  patch
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:  Phab:D1040
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"aaa0cd20fdaf8e923e3a083befc2612154cba629/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="aaa0cd20fdaf8e923e3a083befc2612154cba629"
 Don't eagerly blackhole single-entry thunks (#10414)

 In a parallel program they can actually be entered more than once,
 leading to deadlock.

 Reviewers: austin, simonmar

 Subscribers: michaelt, thomie, bgamari

 Differential Revision: https://phabricator.haskell.org/D1040

 GHC Trac Issues: #10414
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10414#comment:29>
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