I tried to reproduce with the conf file attached but could not.

** Summary changed:

- gnome-software crashed with SIGSEGV in tcache_get() → _FcStrSetGrow → #3 → 
IA__FcStrSetAdd → IA__FcConfigParseAndLoad → FcConfigParseAndLoadDir → #7 → 
FcParseInclude → #9 → doContent → contentProcessor
+ gnome-software crashed with SIGSEGV in tcache_get() → _FcStrSetGrow → 
_FcStrSetAppend → IA__FcStrSetAdd → IA__FcConfigParseAndLoad → 
FcConfigParseAndLoadDir → IA__FcConfigParseAndLoad → FcParseInclude → 
FcEndElement → doContent

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https://bugs.launchpad.net/bugs/1758844

Title:
  gnome-software crashed with SIGSEGV in tcache_get() → _FcStrSetGrow →
  _FcStrSetAppend → IA__FcStrSetAdd → IA__FcConfigParseAndLoad →
  FcConfigParseAndLoadDir → IA__FcConfigParseAndLoad → FcParseInclude →
  FcEndElement → doContent

Status in fontconfig package in Ubuntu:
  New
Status in gnome-software package in Ubuntu:
  New

Bug description:
  Background crash report

  ProblemType: Crash
  DistroRelease: Ubuntu 18.04
  Package: gnome-software 3.28.0-0ubuntu7
  ProcVersionSignature: Ubuntu 4.15.0-12.13-generic 4.15.7
  Uname: Linux 4.15.0-12-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  CrashCounter: 1
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Mar 26 07:05:25 2018
  ExecutablePath: /usr/bin/gnome-software
  InstallationDate: Installed on 2015-07-04 (995 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  InstalledPlugins:
   gnome-software-plugin-flatpak N/A
   gnome-software-plugin-limba   N/A
   gnome-software-plugin-snap    3.28.0-0ubuntu7
  ProcCmdline: /usr/bin/gnome-software --gapplication-service
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SegvAnalysis:
   Segfault happened at: 0x7f55edd0f207 <__GI___libc_malloc+407>:       mov    
(%rdx),%rdi
   PC (0x7f55edd0f207) ok
   source "(%rdx)" (0x6e6f662f6374652f) not located in a known VMA region 
(needed readable region)!
   destination "%rdi" ok
  SegvReason: reading unknown VMA
  Signal: 11
  SourcePackage: gnome-software
  StacktraceTop:
   tcache_get (tc_idx=2) at malloc.c:2943
   __GI___libc_malloc (bytes=48) at malloc.c:3050
   () at /usr/lib/x86_64-linux-gnu/libfontconfig.so.1
   FcStrSetAdd () at /usr/lib/x86_64-linux-gnu/libfontconfig.so.1
   FcConfigParseAndLoad () at /usr/lib/x86_64-linux-gnu/libfontconfig.so.1
  Title: gnome-software crashed with SIGSEGV in tcache_get()
  UpgradeStatus: Upgraded to bionic on 2018-03-15 (10 days ago)
  UserGroups: adm cdrom dip docker landscape libvirt libvirtd lpadmin lxd 
plugdev sambashare sudo

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