gnome-shell crashed with signal 5 in _XIOError() from _XReply() from XRRGetMonitors()

[Jose Gómez]

nouveau crashed when I unplugged my HDMI monitor (will report that bug separately). On startup, I have seen this error.

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: gnome-shell 3.18.4-0ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-15.31-generic 4.4.6
Uname: Linux 4.4.0-15-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
CrashCounter: 1
CurrentDesktop: GNOME
Date: Sun Mar 27 20:56:21 2016
DisplayManager: gdm3
ExecutablePath: /usr/bin/gnome-shell
GsettingsChanges:

InstallationDate: Installed on 2014-02-04 (782 days ago)
InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140203)
ProcCmdline: gnome-shell --mode=gdm --wayland --display-server
Signal: 5
SourcePackage: gnome-shell
StacktraceTop:
 ?? () from /usr/lib/libmutter.so.0
 _XIOError () from /usr/lib/x86_64-linux-gnu/libX11.so.6
 _XReply () from /usr/lib/x86_64-linux-gnu/libX11.so.6
 XRRGetMonitors () from /usr/lib/x86_64-linux-gnu/libXrandr.so.2
 ?? () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
Title: gnome-shell crashed with signal 5 in _XIOError()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[Jose Gómez (adler-dreamcoder)]

Actually, it may not have been nouveau what crashed (I just thought that because once I unplugged the external HDMI monitor I only saw a black screen with a nouveau message).

But actually, that message seems to be old, produced during startup.

Some of the logs may give a hint of what crashed when the HDMI cable was unplugged.

[Apport retracing service (apport)]

StacktraceTop:
 x_io_error () from /tmp/apport_sandbox_sCuyae/usr/lib/libmutter.so.0
 _XIOError (dpy=dpy@entry=0x24ae000) at ../../src/XlibInt.c:1464
 _XReply (dpy=dpy@entry=0x24ae000, rep=rep@entry=0x7ffe8e547d00, extra=extra@entry=0, discard=discard@entry=0) at ../../src/xcb_io.c:708
 XRRGetMonitors (dpy=0x24ae000, window=608, get_active=get_active@entry=1, nmonitors=nmonitors@entry=0x7ffe8e547dbc) at ../../src/XrrMonitor.c:61
 init_randr15 (screen=0x24c41f0) at /build/gtk+3.0-a73mKw/gtk+3.0-3.18.9/./gdk/x11/gdkscreen-x11.c:640

[Launchpad Janitor (janitor)]

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

[Daniel van Vugt (vanvugt)]

Thank you for reporting this bug to Ubuntu.
Ubuntu GNOME 16.04 (xenial) reached end-of-life on April, 2019

https://ubuntugnome.org/ubuntu-gnome-16-04-lts-is-here/
https://wiki.ubuntu.com/XenialXerus/ReleaseNotes/UbuntuGNOME

We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in.