Bug#1008992: xwayland: all X clients hang indefinitely waiting for /tmp/.X11-unix/X0

[Paul Cercueil <paul@crapouillou.net>]

Hi Michel,

Le mer., juil. 6 2022 at 10:09:31 +0200, Michel Dänzer 
<michel.daenzer@mailbox.org> a écrit :
> On 2022-07-05 21:09, Paul Cercueil wrote:
> >  Le mar., juil. 5 2022 at 20:46:44 +0200, Michel Dänzer 
> > <michel.daenzer@mailbox.org> a écrit :
> >
> >  The message in french from gsd-xsettings is "Cannot open display:"
>
> Thanks for the clarification (I thought "affichage" meant "file" :).
>
> It seems likely then that gnome-shell's failure to initialize GDK is 
> due to failing to open the X11 display as well.
>
>
> > >  What value does $DISPLAY contain after logging in?
> >
> >  [...]
> >
> >  $DISPLAY is :0 after logging in. Using DISPLAY=:1 does not seem to 
> > change anything.
>
> Let's take a step back.
>
> The journal should contain a line like
>
>  gnome-shell[<PID>]: Using public X11 display :0, (using :1 for 
> managed services)
>
> The display number before "for managed services" is what gnome-shell 
> itself and gsd-xsettings use for connecting to Xwayland.
>
> Does the corresponding socket exist under /tmp/.X11-unix, e.g. 
> /tmp/.X11-unix/X1 ? If yes, what does lsof say for it?

paul@frank:~$ lsof /tmp/.X11-unix/X*
COMMAND     PID USER   FD   TYPE             DEVICE SIZE/OFF  NODE NAME
gnome-she  5382 paul   55u  unix 0x00000000f9c78a52      0t0 55362 
/tmp/.X11-unix/X1 type=STREAM (LISTEN)
Xwayland  16890 paul    5u  unix 0x000000004a4eebcd      0t0 55360 
/tmp/.X11-unix/X0 type=STREAM (LISTEN)


> Assuming the socket exists and Xwayland is listening on it, maybe try 
> running gsd-xsettings with that display number under strace, to see 
> if that gives any clues about the failure.

Output of "strace" here: https://paste.debian.net/1246358/

I don't see it even trying to open the socket…

-Paul