https://bugs.kde.org/show_bug.cgi?id=456349
Bug ID: 456349
Summary: Incorrect emission of error "xdg_wm_base was destroyed
before children" with multiple xdg_wm_base globals
Product: kwin
Version: 5.24.5
Platform: Debian testing
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: alexandros.frant...@collabora.com
Target Milestone: ---
Created attachment 150407
--> https://bugs.kde.org/attachment.cgi?id=150407&action=edit
Minimal wayland client to reproduce issue
SUMMARY
When a client creates multiple xdg_wm_base globals on the same connection
(e.g., by getting multiple wl_registries), xdg_surface objects created from
each xdg_wm_base should only be associated with that xdg_wm_base global.
However, under kwin there seems to be some kind of incorrect xdg_surface
association happening, as shown in the following pseudocode example of a
client:
> reg1 = wl_display_get_registry(display);
> reg2 = wl_display_get_registry(display);
> wl_display_roundtrip(display);
>
> surf = wl_compositor_create_surface(reg1.wl_compositor);
> xdg_surf = xdg_wm_base_get_xdg_surface(reg1.xdg_wm_base, surf);
>
> xdg_wm_base_destroy(reg2.xdg_wm_base);
> /* ^^ Protocol error "xdg_wm_base was destroyed before children" under kwin,
> * even though no xdg_surface was created from reg2.xdg_wm_base! */
Attached is a minimal wayland client that tests the aforementioned scenario.
STEPS TO REPRODUCE
1. Downloads attached minimal reproducer, extract tar.gz, ensure wayland
libraries, wayland-protocols and wayland-scanner are installed
2. cd kwinbug && make
3 ./kwinbug
OBSERVED RESULT
The program under kwin leads to a protocol error:
> Created wl_registry@2 xdg_wm_base@5
> Created wl_registry@3 xdg_wm_base@8
> Creating xdg_surface from xdg_wm_base@5...
> Creating xdg_surface from xdg_wm_base@5... done
> Destroying xdg_wm_base@8...
> [destroyed object]: error 1: xdg_wm_base was destroyed before children
> Destroying xdg_wm_base@8... done
> Finished!
EXPECTED RESULT
No protocol error is emitted. Tested on mutter, weston, sway and mir.
SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.24.5
KDE Frameworks Version: 5.24.5
Qt Version: 5.15.4
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