[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:  8.8.1
       Component:  Compiler       |              Version:  8.5
      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):

 Someone reported on another github issue (and I've also confirmed) that
 the segfault disappears when compiled with GHC 8.2.2.

 Not sure if important but versions of dependencies are different with GHC
 8.4.2 and 8.2.2:

 - directory-1.3.3.0 in 8.4.2, directory-1.3.0.2 in 8.2.2
 - process-1.6.3.0 in 8.4.2, process-1.6.1.0 in 8.2.2
 - stm-2.5.0.0 in 8.4.2, stm-2.4.5.0 in 8.2.2
 - unix-2.8.0.0 in 8.4.2, unix-2.7.2.2 in 8.2.2

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15260#comment:8>
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