This crash looks to be due to an infinite loop between a child and parent in atk.
This is what I think is happening: - The loops begins with a call to atk_component_get_extents() on a gtk notebook page. - atk_component_get_extents() then calls iface->get_extents() [1] - which translates to gtk_notebook_page_accessible_get_extents() [2] - the gtk notebook page then calls atk_component_get_extents() on it's child [3] - where child's iface->get_extents() translates to atk_socket_component_real_get_extents() [4] - in which the child calls atk_component_get_extents() again on its parent [5] - - - - [1] https://salsa.debian.org/gnome- team/atk/-/blob/9118d44778e4d3a05810012cdcaa69eb4db2c389/atk/atkcomponent.c#L299 [2] https://source.puri.sm/dorota.czaplejewicz/gtk/blob/2be4474a19d16a1a4862d730f5114169b1ccf5ed/gtk/a11y/gtknotebookpageaccessible.c#L340 [3] https://source.puri.sm/dorota.czaplejewicz/gtk/blob/2be4474a19d16a1a4862d730f5114169b1ccf5ed/gtk/a11y/gtknotebookpageaccessible.c#L323 [4] https://salsa.debian.org/gnome- team/atk/-/blob/e7276a0c47a0bd3cfb5654583ca3358ddf51a609/atk/atksocket.c#L104 [5] https://salsa.debian.org/gnome- team/atk/-/blob/e7276a0c47a0bd3cfb5654583ca3358ddf51a609/atk/atksocket.c#L198 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to atk1.0 in Ubuntu. https://bugs.launchpad.net/bugs/1870508 Title: ubiquity crashed with SIGSEGV in g_type_check_instance_is_a() Status in atk1.0 package in Ubuntu: Confirmed Status in ubiquity package in Ubuntu: Confirmed Bug description: == Test Case == 1. Boot to ubiquity-dm 2. Enable the screenreader (Alt+Super+S) 3. Select "Install Ubuntu" 4. Proceed with all the steps of the installer = Actual Result = During installation, when the slideshow is running, this crash occurs. 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: separator: To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/atk1.0/+bug/1870508/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
