In setting up a dedicated source engine game server for Internet/LAN use, I was having problems getting the server to work with MetaMod:Source and the Mani Admin Plugin. It would hard-fault and close as soon as a round would begin.
If you run into this same issue with a memory error and the following error in the server console window:
workthreadpool.cpp (296) : Assertion Failed:CWorkThreadPool::StopWorkThreads: Some threads required forcible termination.
It took me a bit to find this fix, so hopefully the search engines were nice to you and directed you here.