gnome-shell crashed with SIGSEGV in __GI_getenv("EXPAT_ENTITY_DEBUG") from getDebugLevel() from parserInit()

[James Page]

gnome-shell crashes when session is locked - either manually or as a result of a timeout event as configured under security/power management settings.

Session is lost I have to log back in once this happens.

ProblemType: Crash
DistroRelease: Ubuntu 23.10
Package: gnome-shell 45~beta.1-0ubuntu2
ProcVersionSignature: Ubuntu 6.3.0-7.7-generic 6.3.5
Uname: Linux 6.3.0-7-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.27.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
CrashCounter: 1
CurrentDesktop: GNOME-Greeter:GNOME
Date: Wed Sep 6 08:34:06 2023
DisplayManager: gdm3
ExecutablePath: /usr/bin/gnome-shell
ExecutableTimestamp: 1693259374
GsettingsChanges:

InstallationDate: Installed on 2022-09-26 (345 days ago)
InstallationMedia: Ubuntu 22.10 "Kinetic Kudu" - Alpha amd64 (20220829)
ProcCmdline: /usr/bin/gnome-shell
ProcCwd: /var/lib/gdm3
ProcEnviron:
 LANG=en_GB.UTF-8
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 SHELL=/bin/false
 XDG_RUNTIME_DIR=<set>
RelatedPackageVersions: mutter-common 45~beta.1-1ubuntu2
SegvAnalysis: Skipped: missing required field "Disassembly"
Signal: 11
SourcePackage: gnome-shell
StacktraceTop:
 __GI_getenv (name=0x7f8a241b7def "EXPAT_ENTITY_DEBUG") at ./stdlib/getenv.c:31
 ??? () at /lib/x86_64-linux-gnu/libexpat.so.1
 ??? () at /lib/x86_64-linux-gnu/libexpat.so.1
 ??? () at /lib/x86_64-linux-gnu/libexpat.so.1
 ??? () at /lib/x86_64-linux-gnu/libfontconfig.so.1
UpgradeStatus: Upgraded to mantic on 2023-06-16 (82 days ago)
UserGroups: N/A
separator:

[Apport retracing service (apport)]

StacktraceTop:
 __GI_getenv (name=name@entry=0x7f8a241b7def "EXPAT_ENTITY_DEBUG") at ./stdlib/getenv.c:31
 getDebugLevel.constprop.0 (variableName=variableName@entry=0x7f8a241b7def "EXPAT_ENTITY_DEBUG", defaultDebugLevel=0) at ../../src/lib/xmlparse.c:8389
 parserInit (parser=parser@entry=0x7f89bc0131e0, encodingName=encodingName@entry=0x7f8a26f9397a "UTF-8") at ../../src/lib/xmlparse.c:1175
 parserCreate (encodingName=encodingName@entry=0x7f8a26f9397a "UTF-8", memsuite=memsuite@entry=0x0, nameSep=nameSep@entry=0x0, dtd=dtd@entry=0x0) at ../../src/lib/xmlparse.c:1069
 XML_ParserCreate_MM (encodingName=encodingName@entry=0x7f8a26f9397a "UTF-8", memsuite=memsuite@entry=0x0, nameSep=nameSep@entry=0x0) at ../../src/lib/xmlparse.c:969

[Daniel van Vugt (vanvugt)]

Looks like the environment block has been corrupted (otherwise getenv wouldn't crash). This can happen if some code called putenv() but then freed the memory instead of leaking it as it should.

See also bug 1979118 and bug 2027830.

[Daniel van Vugt (vanvugt)]

I can't find any code in mutter, gnome-shell or our extensions making that mistake. Maybe in a library?

[Daniel van Vugt (vanvugt)]

See also bug 2039340.

[Daniel van Vugt (vanvugt)]

This is probably fixed by the fix for bug 2036651.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel van Vugt (vanvugt)]

I just hit this crash after logging out of Noble. gdm's gnome-shell instance to restart the login screen crashed on first attempt. It worked on the second attempt using Xorg instead of Wayland.