Wayvnc crashes with "write from clipboard incomplete"

[mms-neuro]

Problem

When connecting to a wayvnc-session (via ssh-tunnel on localhost) on sway, the screen is shortly shown on the viewer before wayvnc closes with the error ERROR: ../src/data-control.c: 202: write from clipboard incomplete

Version:

wayvnc: 0.6.0
neatvnc: 0.6.0
aml: 0.3.0

Trace-Log

$ wayvnc -Ltrace 127.0.0.1 5900 | tee wayvnc-crash.log
Info: Capturing output DP-1
Info: >> Eizo Nanao Corporation EV2785 0x0000F6E0 (DP-1) 3840x2160+0x0 Power:ON
DEBUG: ../src/server.c: 1167: Trying address: 127.0.0.1
DEBUG: ../src/server.c: 1182: Successfully bound to address
Info: Listening for connections on 127.0.0.1:5900
DEBUG: ../src/ctl-server.c: 724: Initializing wayvncctl socket: /run/user/1000/wayvncctl
Info: New client connection from localhost: 0x5556569d12d0 (ref 1)
Info: Starting screen capture
DEBUG: ../src/main.c: 1069: Client connected, new client count: 1
DEBUG: ../src/ctl-server.c: 849: Enqueueing client-connected event: {"id":"1","hostname":"localhost","username":null,"connection_count":1}
DEBUG: ../src/ctl-server.c: 876: Enqueued client-connected event for 0 clients
Info: Choosing tight encoding for client 0x5556569d12d0
ERROR: ../src/data-control.c: 202: write from clipboard incomplete

Stack trace

$ coredumpctl gdb wayvnc
No match found.

Reproducibility

• Start wayvnc listening on localost
• Start vncviewer on remote machine
  • Crashes almost instantaneous with vncviewer (tiger vnc) and GNOME Connections
  • Works sometimes a bit longer with KRDC

[any1]

Partial writes and errors need to be handled better here: https://github.com/any1/wayvnc/blame/master/src/data-control.c#L199

Have you tried making sure that your clipboard is empty when you connect?

[mms-neuro]

Yes - I cleared the clipboard with xsel -bc and checked that it is indeed empty.

[any1]

Is this still an issue with the newest release?

Was there anything more after the last error? Could it be that you don't have core dumps enabled on your system?

[qdii]

$ wayvnc -f 60 192.168.2.31
Warning: ../wayvnc/src/ctl-server.c: 733: Deleting stale control socket path "/tmp/wayvncctl"
ERROR: ../wayvnc/src/data-control.c: 202: write from clipboard incomplete

$ wayvnc --version
wayvnc: v0.7.2-0-g4de85ac (makepkg)
neatvnc: v0.7.1-0-gb5b330b (makepkg)
aml: v0.3.0-0-gb83f357 (makepkg)

[Opposite34]

I had this problem as well... but only on Hyprland... (installed sway to sanity check myself and it worked there ). I don't think wayvnc directly supports Hyprland anyway as they're moving away from wlroots, but I'm not sure if this should be reported to the Hyprland side either because I doubt they're trying to support wayvnc(?) I'm not sure though.

Regarding debugging this, I'm not sure how to continue forward with it as mine also didn't have a coredump (despite everything else having one), no journalctl either.

[any1]

I don't think wayvnc directly supports Hyprland

WayVNC doesn't directly support any particular compositor. If the compositor (correctly) implements the required protocols, it is supported.