The problem still exists:

 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE)
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) Backtrace:
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 0: /usr/lib/xorg/Xorg (?+0x0) [0x5614c77b0939]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 1: /lib/x86_64-linux-gnu/libc.so.6 (?+0x0) [0x7faa02b2d520]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (?+0x0) [0x7faa02c8baf7]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 3: /usr/lib/x86_64-linux-gnu/dri/crocus_dri.so (?+0x0) [0x7faa0040eed2]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 4: /usr/lib/x86_64-linux-gnu/dri/crocus_dri.so (?+0x0) [0x7faa0094570f]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 5: /usr/lib/x86_64-linux-gnu/dri/crocus_dri.so (?+0x0) [0x7faa00f1cbc3]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 6: /usr/lib/x86_64-linux-gnu/dri/crocus_dri.so (?+0x0) [0x7faa0046337b]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 7: /usr/lib/x86_64-linux-gnu/dri/crocus_dri.so (?+0x0) [0x7faa0043568f]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 8: /usr/lib/x86_64-linux-gnu/dri/crocus_dri.so (?+0x0) [0x7faa004390c9]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 9: /usr/lib/x86_64-linux-gnu/dri/crocus_dri.so (?+0x0) [0x7faa0043f899]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 10: /usr/lib/xorg/modules/libglamoregl.so (?+0x0) [0x7faa0236ea53]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 11: /usr/lib/xorg/modules/libglamoregl.so (?+0x0) [0x7faa0235daa1]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 12: /usr/lib/xorg/modules/libglamoregl.so (?+0x0) [0x7faa02368233]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 13: /usr/lib/xorg/modules/libglamoregl.so (?+0x0) [0x7faa0236871e]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 14: /usr/lib/xorg/Xorg (?+0x0) [0x5614c771d890]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 15: /usr/lib/xorg/Xorg (?+0x0) [0x5614c7713b33]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 16: /usr/lib/xorg/Xorg (?+0x0) [0x5614c763a4c5]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 17: /usr/lib/xorg/Xorg (?+0x0) [0x5614c763e544]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 18: /lib/x86_64-linux-gnu/libc.so.6 (?+0x0) [0x7faa02b14d90]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 19: /lib/x86_64-linux-gnu/libc.so.6 (?+0x0) [0x7faa02b14e40]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) 20: /usr/lib/xorg/Xorg (?+0x0) [0x5614c7627605]
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE)
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) Segmentation fault at address 0x20
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE)
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: Fatal server error:
 Aug 29 18:35:21 titan /usr/libexec/gdm-x-session[582536]: (EE) Caught signal 11 (Segmentation fault). Server aborting