[Pkg-libvirt-maintainers] Bug#987821: libvirt-daemon-system: in/out error during rapid graphics changes in guest closes virt-manager windows

[Paul Dreik]

Package: libvirt-daemon-system
Version: 7.0.0-3
Severity: normal
X-Debbugs-Cc: debianbugs at pauldreik.se

Dear Maintainer,

I use Debian Buster as guest, but the problem also happens for Ubuntu 20.04
as well as Debian Bullseye/testing so I
think the problem lies in the host (running Debian Bullseye/current testing).

I use the guest through virt-manager, running Gnome both in the host and guest.
When there is a large change in the graphics in the guest, such as scrolling
fast on a web page, virt-manager and it's windows (also for other guests) disappear.
In /var/log/syslog, the following message appears:

Apr 30 08:53:48 flygfisken libvirtd[876]: End of file while reading data: In/ut-fel

(sorry for the localized message, In/ut-fel is In/out error in English)

I can open virt-manager again, the machines still run, but it's a bit
annoying since one has to be careful with using the guest.

I tried using another video model such as Virtio but it does not help.

With virtio, disabling or disabling 3d acceleration does not affect the behaviour.

Thanks,
Paul

-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 5.10.0-6-amd64 (SMP w/12 CPU threads)
Kernel taint flags: TAINT_WARN
Locale: LANG=sv_SE.UTF-8, LC_CTYPE=sv_SE.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages libvirt-daemon-system depends on:
ii  adduser                         3.118
ii  debconf [debconf-2.0]           1.5.75
ii  gettext-base                    0.21-4
ii  iptables                        1.8.7-1
ii  libvirt-clients                 7.0.0-3
ii  libvirt-daemon                  7.0.0-3
ii  libvirt-daemon-config-network   7.0.0-3
ii  libvirt-daemon-config-nwfilter  7.0.0-3
ii  libvirt-daemon-system-systemd   7.0.0-3
ii  logrotate                       3.18.0-2
ii  policykit-1                     0.105-30

Versions of packages libvirt-daemon-system recommends:
ii  dmidecode                    3.3-1
ii  dnsmasq-base [dnsmasq-base]  2.85-1
ii  iproute2                     5.10.0-4
ii  mdevctl                      0.78-1
ii  parted                       3.4-1

Versions of packages libvirt-daemon-system suggests:
ii  apparmor    2.13.6-10
pn  auditd      <none>
pn  nfs-common  <none>
pn  open-iscsi  <none>
pn  pm-utils    <none>
pn  radvd       <none>
ii  systemd     247.3-5
pn  systemtap   <none>
pn  zfsutils    <none>

-- Configuration Files:
/etc/libvirt/qemu.conf [Errno 13] Åtkomst nekas: '/etc/libvirt/qemu.conf'

-- debconf information:
  libvirt-daemon-system/id_warning: true