[GHC] #8935: Obscure linker bug leads to crash in GHCi

[GHC]

#8935: Obscure linker bug leads to crash in GHCi
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        Reporter:  simonmar          |            Owner:  trommler
            Type:  bug               |           Status:  patch
        Priority:  high              |        Milestone:  7.8.3
       Component:  Runtime System    |          Version:  7.8.1-rc2
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  GHCi crash        |       Difficulty:  Rocket Science
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by simonmar):

 > For libraries (SOs) coming from installed packages everything should be
 fine. The have a NEEDED tag for all dependencies and the system linker
 will dlopen() them and resolve the symbols.

 But won't that reload all the dependencies every time we load a library?
 We'll end up with multiple copies of `ghc-prim`, `base`, etc. etc. It's
 not just a question of wasted memory, but multiple copies of `base` causes
 problems because we have multiple `stdout`s and other CAFs.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8935#comment:43>
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