[winswitch] rfb mode not working

[Antoine Martin]

On 16/06/2020 19:00, Claudio Negri via shifter-users wrote:
> Hello,
> I have installed xpra v4.0.2-r26625 in Debian GNU/Linux 10 (buster).
> I'm starting it with this command:
> 
> xpra start-desktop --daemon=no --tcp-auth=multifile:filename=/root/secret
> --bind-tcp=0.0.0.0:3013 --html=on --pidfile=/run/xpra.pid
> --start-child=xfce4-session --exit-with-children=yes --bind-rfb=0.0.0.0:5901
> 
> Connection with xpra attach is ok. Connection with HTML5 client is ok.
> When I try to connect with vnc client on port 5901, it loads the "first"
> screen, but the screen never updates. Actions (mouse clicks, drags, ...)
> works correctly, but I have no feedback: the screen is freezed.
The missing screen updates is a recent regression:
http://xpra.org/trac/ticket/2811
Until the next stable update is released with the fix, you can downgrade
to v3.0.x or apply the patch found in the ticket above.

> Disconnecting and reconnecting "refreshes" the screen, but usually at the
> third connection attempt, the xpra server dies with Segmentation fault:
> 
> 2020-06-16 13:53:32,090 xpra is ready.
> 2020-06-16 13:53:32,091 xpra GTK3 X11 desktop version 4.0.2-r26625 64-bit
> 2020-06-16 13:53:32,213  uid=0 (root), gid=0 (root)
> 2020-06-16 13:53:32,214  running with pid 12173 on Linux Debian 10 buster
> 2020-06-16 13:53:32,214  connected to X11 display :0 with 24 bit colors
> 2020-06-16 13:53:32,215  initial resolution: 1856x704
> 2020-06-16 13:53:32,218   :0.0 (491x186 mm - DPI: 96x96) workarea: 1856x673
> at 0x31
> 2020-06-16 13:53:32,218     monitor 2
> 2020-06-16 13:53:32,917 OpenGL is supported on display ':0'
> 2020-06-16 13:53:32,918  using 'llvmpipe (LLVM 7.0, 256 bits)' renderer
> 2020-06-16 13:53:52,717 RFB version 3.8 connection from 10.0.0.1:40238
> 2020-06-16 13:53:52,910 Warning: client did not supply any modifier
> definitions
> 2020-06-16 13:55:16,220 xpra client 0 disconnected.
> 2020-06-16 13:55:21,778 RFB version 3.8 connection from 10.0.0.1:40250
> 2020-06-16 13:55:21,906 Warning: client did not supply any modifier
> definitions
> 2020-06-16 13:55:54,983 xpra client 0 disconnected.
> 2020-06-16 13:55:59,939 RFB version 3.8 connection from 10.0.0.1:40258
> Segmentation fault
I'm not sure about the segfault, I'm not seeing that here.
I wished I did, so I could fix it.

Sorry about the inconvenience.

Cheers,
Antoine

PS: RFB support in xpra is fairly basic, so don't expect it to compete
with a real VNC server.
The fact that it was partly broken for a few months a no-one noticed it
is a clear sign that it isn't used much.

> 
> Thanks,
> Claudio Negri