connectex: Only one usage of each socket address (protocol/network address/port) is normally permitt

处理一个大文本数据，读取到内存，用多线程并发执行，存入数据库。经多次调试，在程序运行一段时间后间歇性报错—— connectex: Only one usage of each socket address (protocol/network address/port) is normally permitt 并发量也从10000逐步减少到80，chan的容量也从10000000减少到300，同时

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