[Bug 250933] AMD Radeon, FreeBSD 12.2, startx fails: Caught signal 6 (Abort trap). Server aborting

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250933

            Bug ID: 250933
           Summary: AMD Radeon, FreeBSD 12.2, startx fails: Caught signal
                    6 (Abort trap). Server aborting
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: pi at FreeBSD.org

Having upgraded from 12.1 to 12.2, using freshly-build ports, startx fails in
the end with a crash message:

Caught signal 6 (Abort trap). Server aborting

The full Xorg.0.log can be found at:
https://people.freebsd.org/~pi/logs/Xorg.0.log

The xorg.conf file:
https://people.freebsd.org/~pi/logs/xorg.conf

The card:

vgapci0 at pci0:65:0:0:    class=0x030000 card=0x05211043 chip=0x67df1002 rev=0xe7
hdr=0x00
    vendor     = 'Advanced Micro Devices, Inc. [AMD/ATI]'
    device     = 'Ellesmere [Radeon RX 470/480/570/570X/580/580X/590]'
    class      = display
    subclass   = VGA
    bar   [10] = type Prefetchable Memory, range 64, base 0x80000000, size
268435456, enabled
    bar   [18] = type Prefetchable Memory, range 64, base 0x90000000, size
2097152, enabled
    bar   [20] = type I/O Port, range 32, base 0x2000, size 256, enabled
    bar   [24] = type Memory, range 32, base 0x9ed00000, size 262144, enabled

Any ideas what can be the next step to debug this ? Rolling back to 12.1 etc.
would be a huge time sink 8-(

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