[kwin] [Bug 460938] New: Plasma suddenly freezes with new window turning black

[Yidaozhan Ya]

https://bugs.kde.org/show_bug.cgi?id=460938

            Bug ID: 460938
           Summary: Plasma suddenly freezes with new window turning black
    Classification: Plasma
           Product: kwin
           Version: 5.26.1
          Platform: Archlinux
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: kwin-bugs-n...@kde.org
          Reporter: y...@yidaozhan.top
  Target Milestone: ---

SUMMARY
During normal use of KDE Plasma, newly-appearing windows (menus, notifications,
etc.) turn completely black, and after two seconds Plasma freezes.

STEPS TO REPRODUCE
This bug appears occasionally and randomly, so there may be no stable way to
reproduce it.

OBSERVED RESULT
![A black
notification](https://imgsrc.baidu.com/super/pic/item/060828381f30e924369fe1f009086e061d95f73c.jpg)

SOFTWARE/OS VERSIONS
Platform: X11
Arch Linux 6.0.3-2-cachyos-bore
KDE Plasma Version: 5.26.1
KDE Frameworks Version: 5.99.0
Qt Version: 5.15.6

ADDITIONAL INFORMATION
After Plasma freezes, I can switch tty and use other ttys normally without any
core dump in the journal. The only error is kcm keyboard or mouse.
Killing kwin_x11 (and sometimes plasmashell) when the window starts to go black
solves the problem, but after it freezes, the only way to solve is to reboot.
This bug may be related to [this
change](https://invent.kde.org/plasma/kwin/-/commit/062afee75bd61e225d72b89c2b5e413e61cd23d8).

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