I installed the patch for X11 (October 3rd), then rebooted, now X is crashing every time I log in on xenodm, sometimes I get a blue screen with debug messages, other times I get a square on my screen with a black background, and it is otherwise completely frozen, and I can't ctrl-alt-Fn into a terminal. I can do this before I try logging in though, and I tried reverting the patch but to no avail.
My wm is xfce, and when I remove my .xsession everything works normal without crashing. I'm far from a novice user but I don't know much about how to properly report issues or what steps I need to take to isolate where the problem is.