gdm3 crashed with SIGSEGV in ensure_display_for_seat()

[L3P3]

https://errors.ubuntu.com/problem/131b21d4843931d315a4548121d7d352cfd1e3a8
https://errors.ubuntu.com/problem/175aaeced63f2d1fd3c1361b9802cfff7821bd42

---

no time for handling, hope everything required in automatically attached files

ubuntu impish proposed

i5 + amd 6000 (radeon) in hp g6 notebook

switched from wayland to xorg by adjusting gdm config file

reason for editing config file: want to try out to switch gpu for ui/games

ProblemType: Crash
DistroRelease: Ubuntu 21.10
Package: gdm3 41~rc-0ubuntu1
ProcVersionSignature: Ubuntu 5.13.0-16.16-generic 5.13.13
Uname: Linux 5.13.0-16-generic x86_64
ApportVersion: 2.20.11-0ubuntu69
Architecture: amd64
CasperMD5CheckResult: unknown
Date: Sat Sep 25 17:42:29 2021
ExecutablePath: /usr/sbin/gdm3
ProcCmdline: /usr/sbin/gdm3
ProcEnviron:
 LANG=de_DE.UTF-8
 PATH=(custom, no user)
SegvAnalysis:
 Segfault happened at: 0x5638df1e412a: mov (%r15),%rcx
 PC (0x5638df1e412a) ok
 source "(%r15)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%rcx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gdm3
StacktraceTop:
 ?? ()
 ?? ()
 g_closure_invoke () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
 g_signal_emit_valist () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: gdm3 crashed with SIGSEGV in g_closure_invoke()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: N/A
mtime.conffile..etc.gdm3.custom.conf: 2021-09-25T17:42:14.958231
separator:

[Apport retracing service (apport)]

StacktraceTop:
 ensure_display_for_seat (factory=factory@entry=0x5638e0106ab0, seat_id=0x5638e0148750 "seat0") at ../daemon/gdm-local-display-factory.c:681
 on_display_status_changed (display=0x5638e00ff360, arg1=<optimized out>, factory=0x5638e0106ab0) at ../daemon/gdm-local-display-factory.c:557
 g_closure_invoke (closure=0x5638e014de30, return_value=0x0, n_param_values=2, param_values=0x7ffdc5ba3720, invocation_hint=0x7ffdc5ba36a0) at ../../../gobject/gclosure.c:810
 signal_emit_unlocked_R (node=node@entry=0x5638e00e7a40, detail=detail@entry=239, instance=instance@entry=0x5638e00ff360, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7ffdc5ba3720) at ../../../gobject/gsignal.c:3741
 g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, var_args=var_args@entry=0x7ffdc5ba38f0) at ../../../gobject/gsignal.c:3497

[Daniel van Vugt (vanvugt)]

Tracking in https://errors.ubuntu.com/problem/131b21d4843931d315a4548121d7d352cfd1e3a8

[Launchpad Janitor (janitor)]

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

[Daniel van Vugt (vanvugt)]

Seems to be a regression in 41~rc-0ubuntu1

[Sebastien Bacher (seb128)]

Reported upstream as https://gitlab.gnome.org/GNOME/gdm/-/issues/739 now

[Sebastien Bacher (seb128)]

Upstream proposed a fix in https://gitlab.gnome.org/GNOME/gdm/-/merge_requests/160 and describe the crash as being an issue when neither wayland nor xorg is working. Could someone describe in which kind of setup they encounter the error?

[L3P3 (l3p3)]

Well, I used the "proposed" repository. After update&upgrade a few days later, the issue was resolved.

[Xosé (ubuntu-galizaweb)]

I log in as the primary user. Then, I try to switch users: I get to the login screen, type in the password, the screen goes black and then comes back to the login screen. I see the input field and the pointer, but the computer is frozen - I can't access a console.

If I reboot, I can log in to a different user, but if then I try to log in to the primary user, the same thing happens.

This only happens when switching between users. If I log out of the current user (end session) I can sign into the second account without any problem.

[Hassan El Jacifi (waver)]

Hi Guys,

Is there any update in regards of this annoying bug?

[Daniel van Vugt (vanvugt)]

The GNOME developers are working on a fix in https://gitlab.gnome.org/GNOME/gdm/-/merge_requests/160

[Hassan El Jacifi (waver)]

Hi Guys,

I tested the latest gdm from jammy and the issue is still present

Package: gdm3
Version: 41.3-1ubuntu2
Status: install ok installed
Priority: optional
Section: gnome

[Daniel van Vugt (vanvugt)]

It looks like the fix in 41.3 is working because we have received zero crash reports since.

Hassan: If you still have problems then please open a new bug.

[Hassan El Jacifi (waver)]

Hello Daniel,

Issue is still present, as requested I opened a new bug #1969516