[GHC] #9011: panic - interactiveUI:setBuffering2

[GHC]

#9011: panic - interactiveUI:setBuffering2
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              Reporter:  irneb       |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  GHCi        |          Version:  7.6.3
            Resolution:              |         Keywords:
      Operating System:  Linux       |     Architecture:  x86_64 (amd64)
       Type of failure:  GHCi crash  |       Difficulty:  Unknown
             Test Case:              |       Blocked By:
              Blocking:              |  Related Tickets:
Differential Revisions:              |
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Comment (by gnezdo):

 I just hit the same problem when I had years worth of leftovers in
 /usr/local/lib/ghc on OpenBSD 5.6 amd64 with ghc-7.6.3. In particular,
 base package was probably messed up (as I surmise from complaints by cabal
 about base-loghexadecimal). This suggests this bug is a different
 manifestation of #7692.

 The workaround for me was to uninstall ghc package, remove everything
 under /usr/local/lib/ghc and reinstall again.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9011#comment:4>
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