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Weston crashes for me when I am pasting in a wayland-native application the contents of the clipboard after copying the contents of some large file from an XWayland-client application. The issue is always reproducible with the same file, which is about 600 KiB large. Smaller files don't have this issue.

Steps to reproduce:

1. Launch a IntelliJ IDEA
2. Open some large text file, and copy the contents to the clipboard with CTRL+C
3. Launch chromium with the ozone flags (--enable-features=UseOzonePlatform --ozone-platform=wayland)
4. Paste the contents of the clipboard into some web page

I obtained the following stack trace from the crash:

Core was generated by `weston'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007fbee2fa85c0 in xcb_get_property_value_length () from /usr/lib/libxcb.so.1
[Current thread is 1 (Thread 0x7fbef2fc48c0 (LWP 6426))]
(gdb) bt full
#0  0x00007fbee2fa85c0 in xcb_get_property_value_length () at /usr/lib/libxcb.so.1
#1  0x00007fbee2ddb18d in  () at /usr/lib/libweston-9/xwayland.so
#2  0x00007fbef34f3faa in wl_event_loop_dispatch () at /usr/lib/libwayland-server.so.0
#3  0x00007fbef34f24e7 in wl_display_run () at /usr/lib/libwayland-server.so.0
#4  0x00007fbef37523b8 in wet_main () at /usr/lib/weston/libexec_weston.so.0
#5  0x00007fbef357e152 in __libc_start_main () at /usr/lib/libc.so.6
#6  0x000055d0fab8605e in  ()

I am on Arch Linux, and using the official package:

❯ pacman -Qi weston      
Name            : weston
Version         : 9.0.0-1
Description     : Reference implementation of a Wayland compositor
Architecture    : x86_64
URL             : https://wayland.freedesktop.org/
Licenses        : MIT
Groups          : None
Provides        : None
Depends On      : glibc  wayland  libxkbcommon  libinput  libunwind  pixman  libdrm  pam  systemd-libs  cairo  libpng  libjpeg-turbo
                  libwebp  mesa  libegl  libgles  glib2  pango  lcms2  mtdev  libx11  libxcb  dbus  libva  libxcursor  colord
                  libpipewire02
Optional Deps   : freerdp: support rdp backend
Required By     : None
Optional For    : None
Conflicts With  : None
Replaces        : None
Installed Size  : 4.89 MiB
Packager        : Sébastien Luttringer <seblu@seblu.net>
Build Date      : Fri 04 Sep 2020 01:41:20 PM EEST
Install Date    : Sun 13 Dec 2020 02:36:04 PM EET
Install Reason  : Explicitly installed
Install Script  : No
Validated By    : Signature

Note that the wayland compositor swaywm is also affected by this bug, as they have borrowed most of the code: https://github.com/swaywm/wlroots/issues/2548