[GHC] #11108: Weak references related crash

[GHC]

#11108: Weak references related crash
-------------------------------------+-------------------------------------
        Reporter:  Saulzar           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.0.1
       Component:  Runtime System    |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime crash     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11746,#11972     |  Differential Rev(s):  Phab:D2189,
       Wiki Page:                    |  Phab:D2512
-------------------------------------+-------------------------------------

Comment (by Ben Gamari <ben@…>):

 In [changeset:"a7a960e43c34e40e1656fa1505605f756a44bb71/ghc"
 a7a960e4/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="a7a960e43c34e40e1656fa1505605f756a44bb71"
 Make the test for #11108 less fragile

 This change should close #11108 by fixing the test case.

 This commit fixes two issues:

 * Make sure that each weak pointer we allocate has a constructor as the
   key, not a thunk. A failure to do so meant these weak pointers died
   prematurely on the 'ghci' WAY.

 * Don't print anything in the finalizer, because they are not guaranteed
   to run.

 Test Plan: validate

 Reviewers: austin, simonmar, erikd, bgamari

 Reviewed By: erikd, bgamari

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D2512

 GHC Trac Issues: #11108
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11108#comment:31>
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