[Bug 251114] x11/xorg: /usr/local/bin/Xorg Segmentation Fault When Switch Virtual TTY

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251114

            Bug ID: 251114
           Summary: x11/xorg: /usr/local/bin/Xorg Segmentation Fault When
                    Switch Virtual TTY
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                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])

This /usr/local/bin/Xorg segmentation fault has occurred twice today within 90
minutes of each occurrance.  In the second occurrence only a file manager, two
consoles, sylpheed, and XFCE DTE were running since boot of system.  This issue
occurred about week ago, but I did not make attempts to save or document as at
time I thought it was just a very rare set of conditions.  Prior to about two
weeks ago this issue had never occurred since I first installed FreeBSD July
2019.

I will attach the related /var/log/Xorg.0.log files and console output of
system information.  I have never has this a bug with X before in all my years
of using X.  I do not know what other information I should provide if there is
other information needed that I have provided.

The problem the three times that has occurred has always occurred when
switching virtual terminals via Ctrl-Alt-Fx where the return to X/XFCE DTE via
ctrl-alt-F9 causes the bug.

Data loss occurs as result of this bug.

In each of the three instances of the bug the system is rebooted.  Ergo the 90
minutes between first and second occurrence of the bug today.

The last occurrence via /var/log/Xorg.0.log was:

[  8568.469] (EE) Backtrace:
[  8568.835] (EE) 0: /usr/local/bin/Xorg (OsInit+0x38a) [0x5b898a]
[  8568.910] (EE) unw_get_proc_name failed: no unwind info found [-10]
[  8568.910] (EE) 1: /lib/libthr.so.3 (?+0x0) [0x802800bb0]
[  8568.917] (EE) unw_get_proc_name failed: no unwind info found [-10]
[  8568.917] (EE) 2: /lib/libthr.so.3 (?+0x0) [0x802800110]
[  8568.923] (EE) 3: ? (?+0x0) [0x7ffffffff003]
[  8568.968] (EE) 4: /usr/local/lib/xorg/modules/drivers/intel_drv.so
(ignore+0x2373) [0x806659333]
[  8568.975] (EE) 5: /usr/local/lib/libdrm.so.2 (drmHandleEvent+0x159)
[0x8016a1ff9]
[  8568.981] (EE) 6: /usr/local/bin/Xorg (OsCleanup+0x4c5) [0x5b8f75]
[  8568.988] (EE) 7: /usr/local/bin/Xorg (WaitForSomething+0x18e) [0x5b0d9e]
[  8568.994] (EE) 8: /usr/local/bin/Xorg (UpdateCurrentTimeIf+0x22c) [0x431e9c]
[  8569.035] (EE) 9: /usr/local/bin/Xorg (InitFonts+0xa4c) [0x43cdac]
[  8569.041] (EE) 10: /usr/local/bin/Xorg (_start+0x9b) [0x425436]
[  8569.048] (EE) 11: ? (?+0x0) [0x800853000]
[  8569.048] (EE) 
[  8569.048] (EE) Segmentation fault at address 0x7040175b0
[  8569.048] (EE) 
Fatal server error:
[  8569.048] (EE) Caught signal 11 (Segmentation fault). Server aborting

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