I came across this bug myself. I suggested a patch to Jeremy see https://lists.macosforge.org/pipermail/xquartz-dev/2018-February/004041.html

Do you use XQuartz in root-mode (i. e. in full screen mode with a window manager)?

Cheers,

Dietmar

Hello!

After upgrading from El Capitan to High Sierra 10.13.2 and finally to 10.13.4

   Process:               X11.bin [96881]
   Path:                  /Applications/Utilities/XQuartz.app/Contents/MacOS/X11.bin

crashes without break with:

   System Integrity Protection: enabled
   
   Crashed Thread:        5
   
   Exception Type:        EXC_CRASH (SIGABRT)
   Exception Codes:       0x0000000000000000, 0x0000000000000000
   Exception Note:        EXC_CORPSE_NOTIFY
   
   Application Specific Information:
   X.Org X Server 1.18.4 Build Date: 20161025
   __glXExtensionInit: AddExtensions failed
   
   abort() called


—
Greetings

 Pete

Radio heißt: Erst denken, dann reden.
TV heißt: Erst schminken, dann reden.


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