Hi, I had reproduce this bug with the same map oa_dm1 on FreeBSD. Now it's fixed for me with i suppose this commit on official github repository:
https://github.com/ioquake/ioq3/commi/fc16ac6bd2d05cba8a2d057994b097e95bae28a0 Now, the server running since two months without crashing. Regards, Pascal