Public bug reported:

I have recently files this bug:
https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/1836772 and decided
to test if it affects Ubuntu 19.04.

Just to remind you, this was about xorg crashing in a virtual machine
that uses virtio VGA with virgl enabled. The host is Arch Linux, the CPU
is Intel Core i7 4770S (Haswell).

Well, xorg crashes on 19.04, too, but with a different backtrace, and
adding ppa:ubuntu-x-swat/updates does not help. So I believe this is a
separate bug.

Disabling virgl on qemu command line helps, but I would rather have it
enabled.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: xorg 1:7.7+19ubuntu12
ProcVersionSignature: Ubuntu 5.0.0-20.21-generic 5.0.8
Uname: Linux 5.0.0-20-generic x86_64
ApportVersion: 2.20.10-0ubuntu27.1
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
Date: Thu Jul 18 21:09:46 2019
DistUpgraded: Fresh install
DistroCodename: disco
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 Red Hat, Inc. Virtio GPU [1af4:1050] (rev 01) (prog-if 00 [VGA controller])
   Subsystem: Red Hat, Inc. Virtio GPU [1af4:1100]
Lsusb: Error: command ['lsusb'] failed with exit code 1:
MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-20-generic 
root=UUID=0617cd90-66d8-4848-8ef8-fdf7fc919a93 ro splash quiet vt.handoff=1
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/01/2014
dmi.bios.vendor: SeaBIOS
dmi.bios.version: 1.12.0-20181126_142135-anatol
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-i440fx-4.0
dmi.modalias: 
dmi:bvnSeaBIOS:bvr1.12.0-20181126_142135-anatol:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-4.0:cvnQEMU:ct1:cvrpc-i440fx-4.0:
dmi.product.name: Standard PC (i440FX + PIIX, 1996)
dmi.product.version: pc-i440fx-4.0
dmi.sys.vendor: QEMU
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.97-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 19.0.8-0ubuntu0~19.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.4-1ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.1-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20180925-2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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


** Tags: amd64 apport-bug disco third-party-packages ubuntu

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https://bugs.launchpad.net/bugs/1837081

Title:
  xorg crashes on virgl with 3d enabled (Haswell on the host),
  ms_dri2_schedule_wait_msc

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