Created attachment 137574 [details]
Using the latest git version of xserver (126.96.36.199) I get a segmentation fault
after performing a VT switch.
Please see the attached Xorg.0.log backtrace.
Thanks for the report, fixed in Git master:
Author: Michel Dänzer <firstname.lastname@example.org>
Date: Mon Feb 26 17:30:57 2018 +0100
glx: Don't pass NULL to glxGetClient