It looks like this is probably a result of gnome-shell crashing. That would bring down mutter which is internal to gnome-shell breaking the connection to Xwayland, making it crash.
Really we need to modify Xwayland to not SIGABRT on such errors, because they are just errors and not bugs in Xwayland itself. ** Summary changed: - Xwayland crashed with SIGABRT in OsAbort() + Xwayland crashed with SIGABRT in OsAbort() from AbortServer() from FatalError() from xwl_log_handler(msg="Error sending request: Broken pipe\n...") ** Information type changed from Private to Public -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1731261 Title: Xwayland crashed with SIGABRT in OsAbort() from AbortServer() from FatalError() from xwl_log_handler(msg="Error sending request: Broken pipe\n...") Status in xorg-server package in Ubuntu: New Bug description: This happened after restarting gdm multiple times to try to obtain the screen in the correct position. The screen was turned by 180 degrees because of bug #1731030. ProblemType: Crash DistroRelease: Ubuntu 18.04 Package: xwayland 2:1.19.5-0ubuntu2 ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4 Uname: Linux 4.13.0-16-generic x86_64 ApportVersion: 2.20.7-0ubuntu4 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: None CrashCounter: 1 CurrentDesktop: GNOME-Greeter:GNOME Date: Thu Nov 9 14:45:28 2017 DistUpgraded: Fresh install DistroCodename: bionic DistroVariant: ubuntu ExecutablePath: /usr/bin/Xwayland GraphicsCard: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. 4th Gen Core Processor Integrated Graphics Controller [1043:178d] Subsystem: ASUSTeK Computer Inc. GM107M [GeForce GTX 850M] [1043:178d] InstallationDate: Installed on 2017-08-21 (79 days ago) InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170820) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 003: ID 0bda:57b4 Realtek Semiconductor Corp. Bus 001 Device 004: ID 13d3:3408 IMC Networks Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: ASUSTeK COMPUTER INC. X550JK ProcCmdline: /usr/bin/Xwayland :1024 -rootless -terminate -core -listen 4 -listen 5 -displayfd 6 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic.efi.signed root=UUID=3eab3ace-7b67-4e6a-aea7-d31b73cc4819 ro quiet splash vt.handoff=7 Renderer: Software Signal: 6 SourcePackage: xorg-server StacktraceTop: OsAbort () ?? () FatalError () ?? () ?? () from /usr/lib/x86_64-linux-gnu/libwayland-client.so.0 Title: Xwayland crashed with SIGABRT in OsAbort() UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: dmi.bios.date: 10/08/2014 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: X550JK.303 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: X550JK dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: 1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK COMPUTER INC. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX550JK.303:bd10/08/2014:svnASUSTeKCOMPUTERINC.:pnX550JK:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX550JK:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: dmi.product.family: X dmi.product.name: X550JK dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.85-1 version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.4-0ubuntu2 version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.4-0ubuntu2 version.xserver-xorg-core: xserver-xorg-core 2:1.19.5-0ubuntu2 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.10.0-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20170309-0ubuntu1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2 xserver.bootTime: Mon Aug 21 17:27:07 2017 xserver.configfile: default xserver.errors: open /dev/dri/card0: No such file or directory open /dev/dri/card0: No such file or directory Screen 0 deleted because of no matching config section. AIGLX: reverting to software rendering xserver.logfile: /var/log/Xorg.0.log xserver.outputs: xserver.version: 2:1.19.3-1ubuntu3 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1731261/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp