[Bug 59383] New: Beyond Divinity (GOG, Steam) doesn't exit cleanly in Wayland when CSMT is enabled

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59383

            Bug ID: 59383
           Summary: Beyond Divinity (GOG, Steam) doesn't exit cleanly in
                    Wayland when CSMT is enabled
           Product: Wine
           Version: 11.2
          Hardware: x86-64
               URL: https://store.steampowered.com/app/219760/Beyond_Divin
                    ity/
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: P2
         Component: winewayland
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ArchLinux

After exiting the game via the menu, the game executable (div.exe) remains in
the process list and occupies one CPU core at 100%. I waited for 5 minutes, but
the process still didn't exit.

The problem happens only when using the native Wayland driver (DISPLAY= wine
div.exe), but it is not reproducible under XWayland or when running the game
under X11 (XFCE). This was reproduced with NVIDIA driver 580.126.09 and with
NVK / Mesa 25.3.4. Running the game under Weston 14.02 also triggers this bug.
Both the Steam and GOG.com versions are affected, but the original demo version
is not.

Disabling CSMT resolves the problem for me.

FWIW, it was commit de0fc7fd (from Wine-10.11) that enabled the game to display
properly in Wayland, and the issue was already present then. Prior to that
commit, the game displayed only a black screen while running; however,
navigating blindly to the 'Quit' button in the menu resulted in a clean
shutdown.

Plain terminal output doesn't reveal anything, let me know if any debug log
would help.

Arch Linux
KDE Plasma 6.5.5
KWin (Wayland)
Nvidia 580.126.09

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