Xwayland fatal error when Wayland output disappears

[Michael Thayer]

Hello Oliver,

I will do that later, but I should have provided more background.  This 
actually occurs if I open and close my laptop a couple of times in a 
short period of time.  I originally did that while experimenting to see 
what would make GNOME Shell recognise my external monitor, and then 
trying to reproduce the various bugs which I found along the way.

Regards
Michael

On 26.10.2017 16:01, Olivier Fourdan wrote:
> Hi,
> 
> Could you please post a backtrace, breaking on xwl_log_handler() ?
> 
> Another interesting data to capture would be the WAYLAND_DEBUG logs 
> (between Xwayland and gnome-shell)
> 
> wl_registry_bind() occurs when actually binding to an interface, which 
> in the case of wl_output occurs when adding a new output, not removing it.
> 
> Cheers,
> Olivier
> 
> 
> On 26 October 2017 at 15:40, Michael Thayer <michael.thayer at oracle.com 
> <mailto:michael.thayer at oracle.com>> wrote:
> 
>     Hello,
> 
>     Reporting this here in case it is of interest.  I have been debugging
>     regular desktop crashes on my new Ubuntu 17.10 systems.  One of them
>     seems to happen when Xwayland FatalError-s out because a Wayland output
>     disappears.  I have only investigated this so far, but hopefully this
>     will be helpful to someone who knows it better: the error is
>     "wl_registry at 2: error 0: invalid global wl_output (28)", which seems to
>     be posted by wl_registry_bind in wayland-server.c, and get picked up in
>     xwl_log_handler in Xwayland.  Xwayland exiting in turn causes GNOME
>     Shell to panic.
> 
>     Regards
>     Michael
>     --
>     Michael Thayer | VirtualBox engineer
>     ORACLE Deutschland B.V. & Co. KG | Werkstr. 24 | D-71384 Weinstadt
> 
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-- 
Michael Thayer | VirtualBox engineer
ORACLE Deutschland B.V. & Co. KG | Werkstr. 24 | D-71384 Weinstadt

ORACLE Deutschland B.V. & Co. KG
Hauptverwaltung: Riesstraße 25, D-80992 München
Registergericht: Amtsgericht München, HRA 95603

Komplementärin: ORACLE Deutschland Verwaltung B.V.
Hertogswetering 163/167, 3543 AS Utrecht, Niederlande Handelsregister
der Handelskammer Midden-Nederland, Nr. 30143697
Geschäftsführer: Alexander van der Ven, Jan Schultheiss, Val Maher