This appears to have been a bug in xorg:
Jan 25 02:55:26 ubuntu kernel: [ 594.634711] Xorg[2060]: segfault at 7fb8ff515063 ip 00007fb8638c048d sp 00007ffff8aa3210 error 4 in libc-2.12.2.so[7fb863849000+178000]
However, I'm marking it as closed since you've noted that it's fixed. Thanks!
This appears to have been a bug in xorg: 12.2.so[ 7fb863849000+ 178000]
Jan 25 02:55:26 ubuntu kernel: [ 594.634711] Xorg[2060]: segfault at 7fb8ff515063 ip 00007fb8638c048d sp 00007ffff8aa3210 error 4 in libc-2.
However, I'm marking it as closed since you've noted that it's fixed. Thanks!