[GHC] #10860: setnumcapabilities001: internal error: ASSERTION FAILED: file rts/Schedule.c, line 400

[GHC]

#10860: setnumcapabilities001: internal error: ASSERTION FAILED: file
rts/Schedule.c, line 400
-------------------------------------+-------------------------------------
        Reporter:  thomie            |                Owner:  simonmar
            Type:  bug               |               Status:  closed
        Priority:  high              |            Milestone:  8.2.1
       Component:  Runtime System    |              Version:  7.10.2
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by Simon Marlow <marlowsd@…>):

 In [changeset:"ce13a9a9f57d61170837532948fed8bc1924a7ab/ghc"
 ce13a9a9/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="ce13a9a9f57d61170837532948fed8bc1924a7ab"
 Fix an assertion that could randomly fail

 Summary:
 ASSERT_THREADED_CAPABILITY_INVARIANTS was testing properties of the
 returning_tasks queue, but that requires cap->lock to access safely.
 This assertion would randomly fail if stressed enough.

 Instead I've removed it from the catch-all
 ASSERT_PARTIAL_CAPABILITIY_INVARIANTS and made it a separate assertion
 only called under cap->lock.

 Test Plan:
 ```
 cd testsuite/tests/concurrent/should_run
 make TEST=setnumcapabilities001 WAY=threaded1 EXTRA_HC_OPTS=-with-
 rtsopts=-DS CLEANUP=0
 while true; do ./setnumcapabilities001.run/setnumcapabilities001 4 9 2000
 || break; done
 ```

 Reviewers: niteria, bgamari, ezyang, austin, erikd

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D2440

 GHC Trac Issues: #10860
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10860#comment:8>
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