[GHC] #13707: xmobar crashes with segmentation faults?

[GHC]

#13707: xmobar crashes with segmentation faults?
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        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.2.1-rc2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 Thanks Rufflewind; I left an `xmobar` instance running in the background
 all of last week but sadly I still have yet to see a crash. I'll try your
 reproducer shortly.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13707#comment:22>
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