Public bug reported:

Replication Steps

sudo mv /usr/bin/Xorg /usr/bin/Xorg.real
echo <<EOF | sudo tee /usr/bin/Xorg
exec /usr/bin/Xorg.real "$@" +iglx
sudo chmod +x /usr/bin/Xorg

--- restart your session to get the +iglx flag applied ---


--- X11 crashes here ---

This requires an AMD graphics card and the open source drivers.
Attempting to replicate in a VMware session (vmsvga drivers) does not
reproduce the issue. I need to check nVidia (I do have an nVidia card I
can put into this machine to test).

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: libglx-mesa0 18.2.2-0ubuntu1
ProcVersionSignature: Ubuntu 4.18.0-16.17-generic 4.18.20
Uname: Linux 4.18.0-16-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.10-0ubuntu13.2
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Thu Mar 14 14:41:06 2019
DistUpgraded: Fresh install
DistroCodename: cosmic
DistroVariant: ubuntu
 virtualbox, 5.2.18, 4.18.0-15-generic, x86_64: installed
 virtualbox, 5.2.18, 4.18.0-16-generic, x86_64: installed
ExtraDebuggingInterest: Yes, if not too technical
 Subsystem: Gigabyte Technology Co., Ltd HD Graphics 530 [1458:d000]
 Advanced Micro Devices, Inc. [AMD/ATI] Baffin [Radeon RX 550 640SP / RX 
560/560X] [1002:67ff] (rev cf) (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Baffin [Radeon RX 550 640SP / RX 560/560X] 
InstallationDate: Installed on 2018-12-13 (90 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
MachineType: Gigabyte Technology Co., Ltd. Z170X-UD5 TH
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-16-generic 
root=UUID=15d5f2c3-35e8-4aa4-a3b0-74b8c9b40dc4 ro quiet splash vt.handoff=1
SourcePackage: mesa
UpgradeStatus: No upgrade log present (probably fresh install) 03/09/2018
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F22g
dmi.board.asset.tag: Default string Z170X-UD5 TH-CF
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: Default string
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi:bvnAmericanMegatrendsInc.:bvrF22g:bd03/09/2018:svnGigabyteTechnologyCo.,Ltd.:pnZ170X-UD5TH:pvrDefaultstring:rvnGigabyteTechnologyCo.,Ltd.:rnZ170X-UD5TH-CF:rvrDefaultstring:cvnDefaultstring:ct3:cvrDefaultstring: Default string Z170X-UD5 TH
dmi.product.sku: Default string
dmi.product.version: Default string
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.95-1
version.libgl1-mesa-dri: libgl1-mesa-dri 18.2.2-0ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.1-3ubuntu2.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-3

** Affects: mesa (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug cosmic ubuntu

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  Running glxgears with Indirect GLX crashes Xorg

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