[GHC] #7836: "Invalid object in processHeapClosureForDead" when profiling with -hb

[GHC]

#7836: "Invalid object in processHeapClosureForDead" when profiling with -hb
-------------------------------------+-------------------------------------
        Reporter:  hyperthunk        |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Profiling         |              Version:  8.5
      Resolution:                    |             Keywords:  profiling
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime crash     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9640             |  Differential Rev(s):  Phab:D4567
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"a303584e58b3f4791bc5881cb722e7f498e14554/ghc"
 a303584e/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="a303584e58b3f4791bc5881cb722e7f498e14554"
 Fix processHeapClosureForDead CONSTR_NOCAF case:

 CONSTR_NOCAF was introduced with 55d535da10d as a replacement for
 CONSTR_STATIC and CONSTR_NOCAF_STATIC, however, as explained in Note
 [static constructors], we copy CONSTR_NOCAFs (which can also be seen in
 evacuate) during GC, and they can become dead, like other CONSTR_X_Ys.
 processHeapClosureForDead is updated to reflect this.

 Reviewers: bgamari, simonmar, erikd

 Subscribers: thomie, carter

 GHC Trac Issues: #7836

 Differential Revision: https://phabricator.haskell.org/D4567
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7836#comment:24>
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