[Bug 251656] x11/xorg-server segmentation fault

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251656

            Bug ID: 251656
           Summary: x11/xorg-server segmentation fault
           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: dave at jetcafe.org
 Attachment #220334 text/plain
         mime type:

Created attachment 220334
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=220334&action=edit
Xorg.0.log

This segfault is repeatable (at the moment). Everytime I try to go into
chromium devtools, this happens:

[  1264.602] (EE) Backtrace:
[  1264.604] (EE) 0: /usr/local/bin/Xorg (?+0x0) [0x41cb00]
[  1264.605] (EE) 1: /lib/libthr.so.3 (?+0x0) [0x80083fb60]
[  1264.606] (EE) 2: /lib/libthr.so.3 (?+0x0) [0x80083f0c0]
[  1264.608] (EE) 3: ? (?+0x0) [0x7fffffffe003]
[  1264.609] (EE) 4: /lib/libc.so.7 (?+0x0) [0x800a126d0]
[  1264.609] (EE) 
[  1264.609] (EE) Segmentation fault at address 0xe082c8000
...
[  1264.609] (EE) 
[  1271.654] (WW) NVIDIA(0): WAIT (2-S, 17, 0x1b14, 0x0000b6a4, 0x0000ba10)
[  1278.654] (WW) NVIDIA(0): WAIT (1-S, 17, 0x1b14, 0x0000b6a4, 0x0000ba10)
[  1281.655] (WW) NVIDIA(0): WAIT (2-S, 17, 0x1a98, 0x0000b6a4, 0x0000ba44)
[  1288.655] (WW) NVIDIA(0): WAIT (1-S, 17, 0x1a98, 0x0000b6a4, 0x0000ba44)

After this occurs, the screen goes off. The X server is found (via remote SSH)
to be running at 100% CPU trying to yield(). The (WW) lines at the end seem to
indicate the server is waiting on the card in my likely naive analysis. 

A complete Xorg.log is attached. I am using branches/2020Q3 as my ports tree.
Note that this segfault only occurred after I upgraded to 12.2, previously 11.2
ran just fine. This bug also occurs using both the old binaries (built against
11.2) and the new binaries (built against 12.2)...yes as a matter of fact I
-did- rebuild everything against 12.2. :D

Thanks in advance.

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