[Bug 234422] graphics/drm-fbsd12.0-kmod: ssh -Y remote_host glxgears crashes system

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234422

            Bug ID: 234422
           Summary: graphics/drm-fbsd12.0-kmod: ssh -Y remote_host
                    glxgears crashes system
           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: naddy at FreeBSD.org
             Flags: maintainer-feedback?(jmd at freebsd.org)
          Assignee: jmd at freebsd.org

Created attachment 200537
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=200537&action=edit
crash information from dmesg

drm-fbsd12.0-kmod on FreeBSD 12-STABLE/amd64, i915kms.ko, Xeon E3-1225v3
(Haswell).

Executing glxgears on a remote system with SSH X11 forwarding immediately
crashes the local system.
$ ssh -Y remote_host glxgears

(The same also happened with drm-stable-kmod-g20180822_1, 11-STABLE/amd64,
radeonkms.ko and xf86-video-ati-18.1.0,1 on a Radeon 5450.  However, I have by
now replaced that configuration with the Intel one above.)

See the attached crash information extracted with dmesg.

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