[GHC] #15508: concprog001 fails with various errors

[GHC]

#15508: concprog001 fails with various errors
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        Reporter:  osa1              |                Owner:  osa1
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.5
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime crash     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #15571            |  Differential Rev(s):  Phab:D5051
       Wiki Page:                    |  (reverted), Phab:D5165
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Comment (by simonmar):

 Yes, the ASSERT is wrong here.

 Note [BLACKHOLE pointing to IND] is talking about when a BLOCKING_QUEUE
 gets overwritten by IND, but this case is different: the ASSERT is looking
 at bq->queue which is normally a MSG_BLACKHOLE.  A MSG_BLACKHOLE can be
 revoked by overwriting with IND, as per the code in `throwToMsg` that you
 found.  This is all fine, so the ASSERT needs to account for bq->queue
 being an IND instead.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15508#comment:17>
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