[Bug 238925] graphics/drm-fbsd12.0-kmod: leaks memory when i915kms.ko is loaded

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238925

            Bug ID: 238925
           Summary: graphics/drm-fbsd12.0-kmod: leaks memory when
                    i915kms.ko is loaded
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: jmd at freebsd.org
          Reporter: lantw44 at gmail.com
             Flags: maintainer-feedback?(jmd at freebsd.org)
          Assignee: jmd at freebsd.org

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 i5-650 CPU and its integrated Intel Ironlake graphics. The
operating system is FreeBSD 12.0 with GNOME desktop environment.

If I remember correctly, the problem has existed since the introduction of
drm-fbsd12.0-kmod port. Here are a few test results I found a few days ago. The
version of drm-fbsd12.0-kmod is 4.16.g20190624.

1. When the system was just booted, wired memory was below 3 GiB.

2. After the system had run for 12 hours, wired memory became 12 GiB. The
desktop was still responsive, but the usage of swap was increasing.

3. After the system had run for 15 hours, wired memory become 15 GiB. The
desktop was non-responsive, and it was slow to run any command from an SSH
login shell. Ctrl-T showed that most of time are spent on swapping. Even Ctrl-C
took several seconds to respond.

4. After I managed to terminate Xorg and bring down the desktop environment,
the shell became responsive again. However, wired memory usage was still 14
GiB. It seemed that there was no way to reclaim the memory so I had to reboot
it.

This kind of memory leak only happens when i915kms.ko from drm-fbsd12.0-kmod is
used. It doesn't happen if i915kms.ko from base is used. If I use i915kms.ko
from base, wired memory usually stays below 3 GiB, and the system can last more
than one month without the need to reboot.

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