[GHC] #12458: Segfault in GHCi runtime type reconstruction

[GHC]

#12458: Segfault in GHCi runtime type reconstruction
-------------------------------------+-------------------------------------
        Reporter:  mniip             |                Owner:  mniip
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.0.2
       Component:  GHCi              |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  GHCi crash        |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2439
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"1766bb3cfd1460796c78bd5651f89d53603586f9/ghc" 1766bb3/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="1766bb3cfd1460796c78bd5651f89d53603586f9"
 RtClosureInspect: Fix off-by-one error in cvReconstructType

 Replaced error-prone index manipulation on a pointer array with
 a simple fold on the array elements.

 Test Plan: Added a test case that triggers the bug

 Reviewers: hvr, austin, bgamari

 Reviewed By: bgamari

 Subscribers: simonpj, thomie

 Differential Revision: https://phabricator.haskell.org/D2439

 GHC Trac Issues: #12458
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12458#comment:4>
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