QEMU from git apparently is fixed, but Ubuntu's version is still
problematic.
Using an Xubuntu 18.04 guest, it's possible to reproduce the crash
using:
while true ; do xrandr --output Virtual-0 --mode 640x480 ; sleep 1 ;
xrandr --output Virtual-0 --mode 1280x720 ; sleep 1 ; xrandr --output
I have run the openSUSE guest again, the output of the gdb command can
be seen at https://paste.ubuntu.com/p/mCRMvkNWYq/
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https://bugs.launchpad.net/bugs/1787070
Title:
Guests using
Public bug reported:
I have noticed that guests using qxl-vga are freezing. They may freeze
after a few minutes or after many hours. The freeze consists of the
entire system hanging, except the cursor, but the cursor animation stops
too. Changing to tty is not possible after this. There are three
QEMU version I'm using now is v3.0.0-65-g1d746ee95d-dirty and has the
problem, the first version I observed the problem was 2.11 from Ubuntu's
repositories.
The fact you are unable to reproduce the bug is unsurprising to me: this
is not the first time I have a problem with QXL VGA and others are
Thank you for the effort to backport this bug fix, I have tested the
proposed version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.5) and the crash
when changing resolution is no longer happening. Unfortunately, after
some time (about 10 minutes, much longer than without this fix), the
guest freezes.
I
I meant the option --enable-opengl and, for old versions, --enable-gtk-
gl. I know it is required to use virtual machines using Intel GVT-g with
dma-buf, and is a option strangely absent from QEMU configuration from
Ubuntu's build. Without it, virgl fails too, making virt-manager have an
option
The bisect is done and this is the result:
5bd5c27c7d284d01477c5cc022ce22438c46bf9f is the first new commit
commit 5bd5c27c7d284d01477c5cc022ce22438c46bf9f
Author: Gerd Hoffmann
Date: Fri Apr 27 13:55:28 2018 +0200
qxl: fix local renderer crash
Make sure we only ask the spice
Unfortunately it did not work, the error is still the same although it
used the GTK interface this time. The command I used was:
$ qemu-system-x86_64 -vga qxl -enable-kvm -cpu host -smp
cores=2,threads=2 -m 2048 -cdrom xubuntu-18.04-desktop-amd64.iso
I have noticed Ubuntu's QEMU and this QEMU
I finally found a real computer on which this bug is present.
The computer in question is a netbook manufactured by Positivo, the Mobo
5900, which is common on schools. It has a touchscreen with a pen which
is compatible with evdev but that doesn't work with libinput. Its
touchscreen is:
Bus 004
Thank you for investigating this. I would bisect QEMU, but wouldn't
investigate its libraries. Consequently, I would never find the cause of
this problem.
For now, I am using -monitor telnet:127.0.0.1:5,server,nowait to
have access to the monitor on QEMU guests.
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