I just tested v19 with ryanzombie mod for my server last night and got crashes for three times (30-40 players online). Here are my crash dump files download: http://pan.baidu.com/s/1qXzSdJY (It is Chinese lol). I didn't toggle the -crashdiag for my server but I hope the bidmp will help you debugging the issues~
EDIT: I didn't have the bidmp for the last crash since it was an out of memory error and the debug file wasn't generated. It seemed that the crash happened when server is starting a session for a new player.