[GHC] #14346: 8.2.1 regression: heap corruption after safe foreign calls

[GHC]

#14346: 8.2.1 regression: heap corruption after safe foreign calls
-------------------------------------+-------------------------------------
        Reporter:  andrewchen        |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.4.4
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime crash     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D5020
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by hsyl20):

 * status:  closed => new
 * differential:   => Phab:D5020
 * component:  Runtime System => Compiler
 * version:  8.2.1 => 8.4.3
 * milestone:  8.4.1 => 8.4.4
 * owner:  bgamari => (none)
 * resolution:  fixed =>


Comment:

 Sadly 404bf05ed3193e918875cd2f6c95ae0da5989be2 never made into HEAD nor
 GHC 8.4 branch and #14375 hasn't been completed before GHC 8.4 release.
 Hence HEAD and 8.4.* suffer from this bug (see #15260).

 I've made a new diff reintroducing the workaround and adding a regression
 test: Phab:D5020.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14346#comment:30>
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