[GHC] #15260: Xmobar crashes with segmentation fault

[GHC]

#15260: Xmobar crashes with segmentation fault
--------------------------------------+----------------------------------
           Reporter:  Voronwe         |             Owner:  (none)
               Type:  bug             |            Status:  new
           Priority:  normal          |         Milestone:  8.6.1
          Component:  Compiler        |           Version:  8.4.3
           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:
--------------------------------------+----------------------------------
 OS: Arch
 Kernel version: 4.16.13-2-ARCH
 Xmobar version: 0.26
 ghc version: 8.4.3

 Xmobar crashes after some time (1 sec or 1 day - very different each
 time).
 And, as I see, reasons are different to:

 1:
 {{{
 voronwe at sul ~> xmobar
 Fields missing from config defaulted:
 additionalFonts,wmClass,wmName,border,borderColor,textOffset,iconOffset,iconRoot,alpha
 xmobar: internal error: evacuate: strange closure type 4689
     (GHC version 8.4.3 for x86_64_unknown_linux)
     Please report this as a GHC bug:
 http://www.haskell.org/ghc/reportabug
 fish: 'xmobar' terminated by signal SIGABRT (Abort)
 }}}

 2:
 {{{
 voronwe at sul ~> xmobar
 Fields missing from config defaulted:
 additionalFonts,wmClass,wmName,border,borderColor,textOffset,iconOffset,iconRoot,alpha
 fish: 'xmobar' terminated by signal SIGSEGV (Address boundary error)
 }}}
 See my issue on xmobar github for details:
 https://github.com/jaor/xmobar/issues/354

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15260>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler