[Pkg-libvirt-maintainers] Bug#837499: virt-viewer & virt-manager's Spice viewer crash on first mouse click on GNOME+Wayland

[intrigeri]

Package: virt-viewer
Version: 4.0-1
Severity: normal

Hi,

on current Debian sid, running GNOME on Wayland, I start a Debian sid
desktop VM with libvirt/QEMU. It boots fine up to the graphical
interface, but as soon as I click somewhere it crashes. The exact
error message depends on how exactly I display the VM locally:

 * using virt-manager's own Spice viewer:

   python2: ../../../../src/cairo-surface.c:928: cairo_surface_reference: Assertion `(_cairo_atomic_int_get (&(&surface->ref_count)->ref_count) > 0)' failed.

 * running a standalone virt-viewer:

   ../../../../src/cairo-surface.c:953: cairo_surface_destroy: Assertion `(_cairo_atomic_int_get (&(&surface->ref_count)->ref_count) > 0)' failed.

I've also seen in the Journal, around the time of the crash:

  gnome-shell[11969]: (wayland/meta-wayland-surface.c:424):meta_wayland_surface_ref_buffer_use_count: runtime check failed: (surface->buffer_ref.buffer->resource)

Running virt-manager with GDK_BACKEND=x11 fixes this problem.

I've found no corresponding bug in upstream bug tracker
(https://bugzilla.redhat.com/buglist.cgi?bug_status=NEW&bug_status=ASSIGNED&classification=Community&product=Virtualization%20Tools&query_format=advanced),
so I wonder if that's a known issue or something specific to my setup.

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (990, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.7.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages virt-viewer depends on:
ii  libatk1.0-0                 2.21.90-2
ii  libc6                       2.24-2
ii  libcairo-gobject2           1.14.6-1+b1
ii  libcairo2                   1.14.6-1+b1
ii  libgdk-pixbuf2.0-0          2.35.4-4
ii  libglib2.0-0                2.49.6-1
ii  libgovirt2                  0.3.4-2
ii  libgtk-3-0                  3.21.5-3
ii  libgtk-vnc-2.0-0            0.6.0-1
ii  libgvnc-1.0-0               0.6.0-1
ii  libpango-1.0-0              1.40.2-1
ii  libpangocairo-1.0-0         1.40.2-1
ii  librest-0.7-0               0.8.0-1
ii  libsoup2.4-1                2.55.90-1
ii  libspice-client-glib-2.0-8  0.32-1
ii  libspice-client-gtk-3.0-5   0.32-1
ii  libvirt-glib-1.0-0          0.2.3-2
ii  libvirt0                    2.2.0-1
ii  libxml2                     2.9.4+dfsg1-1+b1

virt-viewer recommends no packages.

Versions of packages virt-viewer suggests:
ii  netcat-openbsd [netcat]      1.105-7
ii  netcat-traditional [netcat]  1.10-41

-- no debconf information

-- 
intrigeri