Not sure if this is reproducable or if it was just perfect timing. I had started to connect a character to the world:

Login Lock Check (MinStatus: 100):, UserStatus: 255, CharID: 394
AddAuth: 150 Key: 1204248869
1148602 New client from ip: 192.168.1.1 port: 2142
ZoneAuth: Access Key, 1204248869, Character Name, John, Account ID, 150, TimeStamp, 1204248869
Loading new Zone 'steppes'
Loading 1753 spawn entries...
Removing client from ip:192.168.1.1 port:2142
Got signal 11

Soon as the connection started, I realized I didn't want that char and hit the Exit link on the client UI (lower-left) and the world threw the Signal 11. Shortly after, the world crashed and reloaded.
Since it's a world crash, I wanted to bug it. I'm sure there will be those who disconnect during zone in, if that is in fact how to create the crash.
edit: Yes, I can make it happen everytime with Rev 74, client 4696L. Yippie!

Thanks for the heads up. It has been fixed. It was caused when the hand off of the client occurred from the world to the zone server.