[GHC] #5611: Asynchronous exception discarded after safe FFI call

[GHC]

#5611: Asynchronous exception discarded after safe FFI call
-------------------------------------+-------------------------------------
        Reporter:  joeyadams         |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.2.1
       Component:  Runtime System    |                 Version:  7.0.3
      Resolution:                    |                Keywords:  FFI,
                                     |  exception
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
-------------------------------------+-------------------------------------
Changes (by thomie):

 * owner:  simonmar =>
 * status:  closed => new
 * resolution:  fixed =>
 * cc: ezyang (added)


Comment:

 This test just failed on me, but just once, not repeatedly.

 It printed `child: Done waiting` intead of `user error (Exception
 delivered successfully)`.

 I was validating an unrelated patch on Phabricator:
 https://phabricator.haskell.org/harbormaster/build/5908/ (Phab:D1209)

 CC ezyang, since he worked on this problem before, according to comment:1.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5611#comment:3>
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