https://bugs.kde.org/show_bug.cgi?id=368066

            Bug ID: 368066
           Summary: kwin causes X to leak video memory
           Product: kwin
           Version: 5.7.3
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: glx
          Assignee: kwin-bugs-n...@kde.org
          Reporter: oneof...@gmail.com

Using kwin 5.7.4, but applies to 5.7.3, after few hours of usage (chrome, wine
and hipchat) the system becomes unresponsive and after some tracking I noticed
that running nvidia-smi prints that Xorg is using 7.5g of GPU memory.

Restarting kwin doesn't free that memory, only restarting X.

Reproducible: Always

Steps to Reproduce:
1. Use KF5.
2. Use the computer for few hours (Chrome, VSCode, HipChat4 and wine)


Actual Results:  
Random windows turns completely black and the system becomes mostly
unresponsive until I kill X.

Expected Results:  
Well, not make X use up all my GPU memory.

This only happens with kwin, using Gnome 3 and LXDE with openbox does not
trigger this bug.

nvidia-* 370.23, xorg-server 1.18.4, the card is Gigabyte G1 1080.

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