[qxl] Xorg crashed with assertion failure in DRIMoveBuffersHelper

[Elliot]

After doing a normal installation with erasing the disk in GNOME Boxes, I cannot log into the Ubuntu Xorg session. Wayland works fine, but this still isn't a workaround if the user wants to use Xorg for any given reason.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu12
ProcVersionSignature: Ubuntu 5.3.0-24.26-generic 5.3.10
Uname: Linux 5.3.0-24-generic x86_64
ApportVersion: 2.20.11-0ubuntu15
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Sun Jan 5 10:21:36 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Red Hat, Inc. QXL paravirtual graphic card [1b36:0100] (rev 04) (prog-if 00 [VGA controller])
   Subsystem: Red Hat, Inc. QEMU Virtual Machine [1af4:1100]
InstallationDate: Installed on 2020-01-05 (0 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200104)
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 Device 002: ID 08e6:4433 Gemalto (was Gemplus) GemPC433-Swap
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Lsusb-t:
 /: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
 /: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
 /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
     |__ Port 1: Dev 2, If 0, Class=Chip/SmartCard, Driver=, 12M
 /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/6p, 480M
MachineType: QEMU Standard PC (Q35 + ICH9, 2009)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-24-generic root=UUID=3faaad6a-d32e-4d07-877f-3ef17831e142 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/01/2014
dmi.bios.vendor: SeaBIOS
dmi.bios.version: ?-20191223_100556-anatol
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-q35-4.2
dmi.modalias: dmi:bvnSeaBIOS:bvr?-20191223_100556-anatol:bd04/01/2014:svnQEMU:pnStandardPC(Q35+ICH9,2009):pvrpc-q35-4.2:cvnQEMU:ct1:cvrpc-q35-4.2:
dmi.product.name: Standard PC (Q35 + ICH9, 2009)
dmi.product.version: pc-q35-4.2
dmi.sys.vendor: QEMU
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.100-4
version.libgl1-mesa-dri: libgl1-mesa-dri 19.2.4-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.5+git20191008-0ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20190815-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

[Daniel van Vugt (vanvugt)]

It looks like the recurring problem here is indeed just Xorg:

[ 604.230] (EE) Backtrace:
[ 604.230] (EE) 0: /usr/lib/xorg/Xorg (OsLookupColor+0x13c) [0x5576c3d8facc]
[ 604.231] (EE) 1: /lib/x86_64-linux-gnu/libpthread.so.0 (funlockfile+0x60) [0x7f6767b6359f]
[ 604.231] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (gsignal+0xcb) [0x7f67679a13eb]
[ 604.232] (EE) 3: /lib/x86_64-linux-gnu/libc.so.6 (abort+0x12b) [0x7f6767980899]
[ 604.232] (EE) unw_get_proc_name failed: no unwind info found [-10]
[ 604.232] (EE) 4: /lib/x86_64-linux-gnu/libc.so.6 (?+0x0) [0x7f676798075a]
[ 604.232] (EE) 5: /lib/x86_64-linux-gnu/libc.so.6 (__assert_fail+0x46) [0x7f6767992006]
[ 604.232] (EE) 6: /usr/lib/xorg/Xorg (DRIMoveBuffersHelper+0xc15) [0x5576c3d5aaa5]
[ 604.232] (EE) 7: /usr/lib/xorg/Xorg (DRI2Authenticate+0xa2) [0x5576c3d5c0f2]
[ 604.233] (EE) 8: /usr/lib/xorg/Xorg (DRI2GetParam+0x944) [0x5576c3d5d4b4]
[ 604.233] (EE) 9: /usr/lib/xorg/Xorg (SendErrorToClient+0x354) [0x5576c3c2ef44]
[ 604.233] (EE) 10: /usr/lib/xorg/Xorg (InitFonts+0x3b4) [0x5576c3c32fd4]
[ 604.233] (EE) 11: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf3) [0x7f67679821e3]
[ 604.233] (EE) 12: /usr/lib/xorg/Xorg (_start+0x2e) [0x5576c3c1ca1e]

[Daniel van Vugt (vanvugt)]

Please report the issue to the upstream developers here:

  https://gitlab.freedesktop.org/groups/xorg/-/issues

and then tell us the new issue ID.

[Elliot (cheese-e-boi)]

Set to issue #10 [here](https://gitlab.freedesktop.org/xorg/driver/xf86-video-qxl/issues/10).

[Daniel van Vugt (vanvugt)]

It's possible the bug is in xorg-server and it's just failing to handle a situation which is only encountered with the qxl driver.

[Daniel van Vugt (vanvugt)]

Actually the stack looks the same as what people see in VirtualBox so in the absence of a journal log let's assume it's the same as bug 1871752 and friends.