After about 20 minutes of playing NS (very latest version of HLDS and NS server) with about 8 players, the server seg faults and crashes. This is on any map.
I ran with the -debug parameter:
CRASH: Fri Apr 15 21:52:40 BST 2005
Start Line: ./hlds_i686 -game ns +maxplayers 12 +map ns_nothing -debug -pidfile hlds.12540.pid
End of crash report
This is Fedora Linux Core 2 on a dedicated server.