gnome-shell crashed with SIGSEGV

[Jonathan Kamens]

Was using laptop standalone (laptop LCD display only). Put it into dock which has two monitors plugged into it. Forgot that it was still powered on, so I pushed the power button on the dock, thinking I was waking it up when in fact I was putting it to sleep. When monitors didn't come alive, I opened the lid to see if that would help. That woke it up. Then I closed the lid again to switch to just the monitors. The monitors went blank for a while then I was able to log in, and that's the point at which I got the pop-up about gnome-shell having crashed.

ProblemType: Crash
DistroRelease: Ubuntu 18.10
Package: gnome-shell 3.30.1-2ubuntu1
ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
Uname: Linux 4.18.0-10-generic x86_64
ApportVersion: 2.20.10-0ubuntu13
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Nov 9 08:26:51 2018
DisplayManager: gdm3
ExecutablePath: /usr/bin/gnome-shell
InstallationDate: Installed on 2018-09-27 (42 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
ProcCmdline: /usr/bin/gnome-shell
ProcEnviron:
 LC_COLLATE=C
 PATH=(custom, user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7fd7d7a083e0: mov 0x128(%rdi),%rax
 PC (0x7fd7d7a083e0) ok
 source "0x128(%rdi)" (0x00000128) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-shell
StacktraceTop:
 () at /usr/lib/x86_64-linux-gnu/mutter/libmutter-clutter-3.so
 () at /usr/lib/x86_64-linux-gnu/mutter/libmutter-clutter-3.so
 () at /usr/lib/x86_64-linux-gnu/mutter/libmutter-clutter-3.so
 clutter_x11_handle_event () at /usr/lib/x86_64-linux-gnu/mutter/libmutter-clutter-3.so
 () at /usr/lib/x86_64-linux-gnu/libmutter-3.so.0
Title: gnome-shell crashed with SIGSEGV
UpgradeStatus: Upgraded to cosmic on 2018-11-08 (0 days ago)
UserGroups: adm cdrom dip libvirt lpadmin plugdev sambashare sudo vboxusers wireshark
modified.conffile..etc.apport.crashdb.conf: [modified]
mtime.conffile..etc.apport.crashdb.conf: 2018-10-04T06:36:50.792292

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1783673, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.