https://bugs.freedesktop.org/show_bug.cgi?id=60182
--- Comment #9 from Ilija Hadzic ihadzic@research.bell-labs.com --- (In reply to comment #8)
So since you find root case, LightDM log is not necessary now, I am correct?
No, I didn't find the root cause. I am only assuming (based on the last message in your Xorg.0.log file) that you are seeing the same kind of a crash that I have been seeing recently.
So I would like you to test if the patch that I posted fixes the problem for you. If it does, then there are two open issues that remain: a) should we push my patch upstream (i.e. to at least prevent the crash of affected users like you) and b) what really causes the double-free. The latter is what we have no idea about yet.
Any additional logs that you can produce in the meantime would be useful.