I get logged out immediately after login to an X session (QXL Xorg driver on kernel 5.4)

[Chris Ward]

I just installed ubuntu 20.04 in a virtual machine and did 'apt-get update;apt-get upgrade' to get current (using Ctl-Alt-F2 to get a non-X session). After that, I tried logging in to a gnome session, and got logged out during login processing. This happened a few times; then I installed xfce4, rebooted, and got the same behaviour (logout during login processing) while trying to log in to an xfce session.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-14.17-generic 5.4.18
Uname: Linux 5.4.0-14-generic x86_64
ApportVersion: 2.20.11-0ubuntu18
Architecture: amd64
Date: Tue Feb 25 12:06:47 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
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 2020-02-25 (0 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200124)
Lsusb:
 Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd QEMU USB Tablet
 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 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
 /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/6p, 480M
     |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 480M
MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=linux
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-14-generic root=UUID=14c5cf63-466a-44d5-add6-bd5fc486c067 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: 1.12.0-1
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-i440fx-eoan
dmi.modalias: dmi:bvnSeaBIOS:bvr1.12.0-1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-eoan:cvnQEMU:ct1:cvrpc-i440fx-eoan:
dmi.product.name: Standard PC (i440FX + PIIX, 1996)
dmi.product.version: pc-i440fx-eoan
dmi.sys.vendor: QEMU
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.100-4
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.0-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.7-2ubuntu1
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

[Chris Ward (tjcw)]

Here is the output from 'journalctl'. I think it shows X11 taking a SIGABRT (signal 6) but I cannot find any X11 log files in /var/log . My next tack will be to try installing a new version of ubuntu 20.04 .

[Chris Ward (tjcw)]

I just downloaded today's build of Focal Fossa (25 Feb 2020, sha256sum 7cdae20c68d9fb1854024ee5e77cee00dfb6e27b9502be6bc15ff5a050b0d259 ) and got the same problem. This is probably specific to running in a virtual machine; I am using the virt-manager in Ubuntu 19.10 up-to-date as of 25 Feb 2020; since if it happened on real hardware then everyone trying Focal Fossa would run into the problem.

[Daniel van Vugt (vanvugt)]

There's a lot of information in that log. One possible reason for this bug I can see is:

Feb 25 11:06:55 tjcw-Standard-PC-i440FX-PIIX-1996 /usr/lib/gdm3/gdm-x-session[882]: (WW) qxl(0): drmSetMaster failed: Permission denied
...
Feb 25 11:06:55 tjcw-Standard-PC-i440FX-PIIX-1996 /usr/lib/gdm3/gdm-x-session[882]: (EE) systemd-logind: failed to take device /dev/dri/card0: Operation not permitted
Feb 25 11:06:55 tjcw-Standard-PC-i440FX-PIIX-1996 /usr/lib/gdm3/gdm-x-session[882]: (EE) /dev/dri/card0: failed to set DRM interface version 1.4: Permission denied

This means there's some kind of incompatibility between the qxl Xorg driver and the kernel. Indeed that would only be a problem for virtual machines.

[Daniel van Vugt (vanvugt)]

Does logging into "Ubuntu on Wayland" (choose that on the login screen) avoid the problem?

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Chris Ward (tjcw)]

The login screen doesn't offer a "Ubuntu on Wayland" option; the options offered are
GNOME on Xorg
GNOME + Remmina Kiosk
Ubuntu
Xfce Session

All 4 options log me out immediately after login

[Daniel van Vugt (vanvugt)]

I suggest as a workaround to try and reconfigure the VM itself to use a different virtual GPU type which then doesn't require the guest OS to use the qxl driver.

[Chris Ward (tjcw)]

How do I reconfigure the VM to do this ?

[Iain Lane (laney)]

The messages Daniel found in comment #4 indicate a systemd issue that I fixed upstream a few months ago. I'm sorry, I thought we already had the fix in Ubuntu but it seems we don't - it's in v245.

We need the commits

625077264ba01a108386eeea733ee244e6b7ff14
867af7282b2eccab53727714172b1081532ca8de (actually this is optional)
d5016c21d7bb60f38aa461887cd843fabbc986ca
3a827125e70aa2cabbb97334f75576229efd6868 (also optional but we should take it)

to fix this issue.

You can read the upstream issue: https://github.com/systemd/systemd/issues/14322 for more information.

[Iain Lane (laney)]

Rationale for high: if you hit this bug, you cannot log in to a desktop system, since logind can't access the DRM device nodes

[Balint Reczey (rbalint)]

Fixed by landing 245 to Focal.

[Chris Ward (tjcw)]

Yes, this is fixed in today's build of Focal Fossa. The bug can be closed.