[Bug 250226] graphics/drm-fbsd12.0-kmod: massive memory leak

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250226

            Bug ID: 250226
           Summary: graphics/drm-fbsd12.0-kmod: massive memory leak
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11 at FreeBSD.org
          Reporter: dinoex at FreeBSD.org
          Assignee: x11 at FreeBSD.org
             Flags: maintainer-feedback?(x11 at FreeBSD.org)

drm-fbsd12.0-kmod is 4.16.g20200221.

My desktop computer has 16 GiB RAM, but it seems that drm-fbsd12.0-kmod keeps
leaking memory, using up all memory in one day and forcing me to reboot.

This computer uses Intel i5-6200U CPU and its integrated Intel Skylake
graphics.
The operating system is FreeBSD 12.1.

The version of drm-fbsd12.0-kmod is 4.16.g20200221.

When the system was just booted, wired memory was below 1 GiB.

top:
Mem: 3049M Active, 393M Inact, 174M Laundry, 981M Wired, 497M Buf, 11G Free
Swap: 16G Total, 16G Free

After the system had run for a few hours, wired memory became 14 GiB.
The desktop was still responsive, but the usage of swap was increasing.

After the system had run longer, wired memory become 16 GiB.
The desktop was non-responsive, even shell commands are frozen for 40 secs.

"vmstat -z" keeps stable:
1,392,114,304 TOTAL 1,333,297,844 58,816,460

See also:
https://github.com/FreeBSDDesktop/kms-drm/issues/247

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