[Bug 1870508] Re: ubiquity crashed with SIGSEGV in g_type_check_instance_is_a()

[Brian Murray]

** Tags added: rls-ff-incoming

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Title:
  ubiquity crashed with SIGSEGV in g_type_check_instance_is_a()

Status in ubiquity package in Ubuntu:
  New

Bug description:
  Crashed during a screen reader installation in install only mode

  ProblemType: Crash
  DistroRelease: Ubuntu 20.04
  Package: ubiquity 20.04.9
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu22
  Architecture: amd64
  CasperVersion: 1.442
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Apr  3 10:55:58 2020
  ExecutablePath: /usr/lib/ubiquity/bin/ubiquity
  ExecutableTimestamp: 1585729537
  InstallCmdLine: file=/cdrom/preseed/ubuntu.seed initrd=/casper/initrd quiet splash --- maybe-ubiquity
  InterpreterPath: /usr/bin/python3.8
  LiveMediaBuild: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
  ProcCmdline: /usr/bin/python3 /usr/lib/ubiquity/bin/ubiquity --greeter --only
  ProcCwd: /
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
  Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu1
  PythonDetails: N/A
  SegvAnalysis:
   Segfault happened at: 0x7fbd15f8f16a <g_type_check_instance_is_a+186>:	mov    %rax,-0x20(%rsp)
   PC (0x7fbd15f8f16a) ok
   source "%rax" ok
   destination "-0x20(%rsp)" (0x7ffe329d3ff0) not located in a known VMA region (needed writable region)!
  SegvReason: writing unknown VMA
  Signal: 11
  SourcePackage: ubiquity
  StacktraceTop:
   g_type_check_instance_is_a () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
   atk_component_get_extents () from /lib/x86_64-linux-gnu/libatk-1.0.so.0
   ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
   atk_component_get_extents () from /lib/x86_64-linux-gnu/libatk-1.0.so.0
   atk_component_get_extents () from /lib/x86_64-linux-gnu/libatk-1.0.so.0
  Title: ubiquity crashed with SIGSEGV in g_type_check_instance_is_a()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
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