[GHC] #11108: Weak references related crash

[GHC]

#11108: Weak references related crash
-------------------------------------+-------------------------------------
        Reporter:  Saulzar           |                Owner:  akio
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       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:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"9363f04d0ff22f3d898af35bb5432c4287e6dc9a/ghc" 9363f04/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="9363f04d0ff22f3d898af35bb5432c4287e6dc9a"
 Handle promotion failures when scavenging a WEAK (#11108)

 Previously, we ignored promotion failures when evacuating fields of
 a WEAK object. When a failure happens, this resulted in an WEAK object
 pointing to another object in a younger generation, causing crashes.

 I used the test case from #11746 to check that the fix is working.
 However I haven't managed to produce a test case that quickly reproduces
 the issue.

 Test Plan: ./validate

 Reviewers: austin, bgamari, simonmar

 Reviewed By: simonmar

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D2189

 GHC Trac Issues: #11108
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11108#comment:19>
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