[GHC] #15260: Xmobar crashes with segmentation fault

[GHC]

#15260: Xmobar crashes with segmentation fault
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        Reporter:  Voronwe        |                Owner:  (none)
            Type:  bug            |               Status:  new
        Priority:  normal         |            Milestone:  8.6.1
       Component:  Compiler       |              Version:  8.4.3
      Resolution:                 |             Keywords:
Operating System:  Linux          |         Architecture:  x86_64 (amd64)
 Type of failure:  Runtime crash  |            Test Case:
      Blocked By:                 |             Blocking:
 Related Tickets:                 |  Differential Rev(s):
       Wiki Page:                 |
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Comment (by osa1):

 Thanks for reporting. I tried running `xmobar` with your config but
 couldn't reproduce this (Ubuntu 18.04, x86_64). Could you try running
 xmobar using the debug runtime with sanity checks enabled and tell us if
 you get a different error? Add `-rtsopts -debug` to `ghc-options` in
 `xmobar.cabal`, and then run `xmobar` as `xmobar +RTS -DS`. To make sure
 you're running with the expected runtime check `xmobar +RTS --info`, the
 `RTS way` should be `rts_debug`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15260#comment:1>
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