gnome-shell crashed with SIGSEGV in __GI_getenv("MESSAGES_DEBUG") from [g_getenv() from] should_drop_message()

[Cliff Carson]

New install today. Tested switching to another user on this system which was successful but when I switch back this crash was waithing.

ProblemType: Crash
DistroRelease: Ubuntu 23.10
Package: gnome-shell 44.3-1ubuntu1
ProcVersionSignature: Ubuntu 6.3.0-7.7-generic 6.3.5
Uname: Linux 6.3.0-7-generic x86_64
ApportVersion: 2.26.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: GNOME-Greeter:GNOME
Date: Fri Jul 14 14:58:47 2023
DisplayManager: gdm3
ExecutablePath: /usr/bin/gnome-shell
GsettingsChanges:

InstallationDate: Installed on 2023-07-14 (0 days ago)
InstallationMedia: Ubuntu 23.10 "Mantic Minotaur" - Daily amd64 (20230712.1)
ProcCmdline: /usr/bin/gnome-shell
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/false
 XDG_RUNTIME_DIR=<set>
RelatedPackageVersions: mutter-common 44.3-1ubuntu1
SegvAnalysis:
 Segfault happened at: 0x7f8686e3f95d <__GI_getenv+173>: cmp (%rbx),%r12w
 PC (0x7f8686e3f95d) ok
 source "(%rbx)" (0x37970fcf9c425fae) not located in a known VMA region (needed readable region)!
 destination "%r12w" ok
 Stack memory exhausted (SP below stack segment)
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: gnome-shell
StacktraceTop:
 __GI_getenv (name=0x7f86877a93e7 "MESSAGES_DEBUG") at ./stdlib/getenv.c:84
 () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_log_writer_default () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
 ()
 g_log_structured_array () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
Title: gnome-shell crashed with SIGSEGV in __GI_getenv()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: N/A
separator:

[Apport retracing service (apport)]

StacktraceTop:
 __GI_getenv (name=0x7f86877a93e7 "MESSAGES_DEBUG") at ./stdlib/getenv.c:84
 should_drop_message (log_level=log_level@entry=G_LOG_LEVEL_DEBUG, log_domain=log_domain@entry=0x0, fields=fields@entry=0x7f86417f8820, n_fields=n_fields@entry=6) at ../../../glib/gmessages.c:2649
 g_log_writer_default (log_level=log_level@entry=G_LOG_LEVEL_DEBUG, fields=fields@entry=0x7f86417f8820, n_fields=n_fields@entry=6, user_data=0x0) at ../../../glib/gmessages.c:2764
 default_log_writer (log_level=G_LOG_LEVEL_DEBUG, fields=0x7f86417f8820, n_fields=6, user_data=<optimized out>) at ../src/main.c:403
 g_log_structured_array (n_fields=6, fields=0x7f86417f8820, log_level=G_LOG_LEVEL_DEBUG) at ../../../glib/gmessages.c:1983

[Daniel van Vugt (vanvugt)]

It looks like the gnome-shell process has a corrupt __environ block causing getenv() to crash. Not sure how or where that could happen.

[Daniel van Vugt (vanvugt)]

The "how" might be a mistaken use of putenv() in which the caller has forgotten that the parameter string needs to live forever.

[Daniel van Vugt (vanvugt)]

This is probably fixed by the fix for bug 2036651.