[Bug 249932] graphics/drm-fbsd12.0-kmod: panic on certain graphics operations

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249932

            Bug ID: 249932
           Summary: graphics/drm-fbsd12.0-kmod: panic on certain graphics
                    operations
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: [email protected]
          Reporter: [email protected]
          Assignee: [email protected]
             Flags: maintainer-feedback?([email protected])

Created attachment 218349
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=218349&action=edit
/var/crash/core.txt.1

Scenario:
- FreeBSD 12.1-RELEASE-p6 #6 r362488M
- latest ports, amongst them drm-fbsd12.0-kmod-4.16.g20200221,
drm-kmod-g20190710, gpu-firmware-kmod-g20200920
- CPU: AMD Phenom(tm) II X4 955 Processor (3210.75-MHz K8-class CPU)
- Chipset: "ATI Radeon HD 4290" (ChipID = 0x9714)
- Starting X via sddm
- Logging in
- Starting firefox
- Modify toolbar, drag one icon

Result:
- The machine panics

Note:
- This has been happening for a long time; from time to time I am checking
whether it might be working again.

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