boost::asio async_accept总是发生错误，error_code.value(） 是 22，这意味着参

我使用了boost：：asio，有8个线程

boost::asio::io_service ios;

boost::asio::ip::tcp::acceptor(ios);
boost::asio::ip::tcp::endpoint endpoint(boost::asio::ip::tcp::v4(), port);
acceptor.open(endpoint.protocol());
acceptor.set_option(boost::asio::ip::tcp::acceptor::reuse_address(true));
acceptor.listen();
LocalTcpServer::getInstance()->initialize(ios, acceptor, pool);
boost::thread_group th_group;
for(i=0; i< 8; i++)
th_group.add_thread(new boost::thread(boost::bind(&boost::asio::io_service::run, &ios)));
th_group.join_all();


session::start()
{
socket.async_read_some(boost::asio::buffer(buffer), m_strand.wrap(boost::bind(&session::handle_read, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)))
}
session::handleread(boost::system::error_code &e, size_t byteTrans)
{
if(e || byteTrans == 0 )
{
socket.shutdown(...)
//socketRelease close the socket and delete this
timeInfo->timer->async_wait(boost::bind(socketRelease(), ...);
}
else
{
//deal with data whit pool;  
}
socket.async_read_some(.....);
}




LocaltcpServer::initialize(ios, acceptor, pool){ 
//init, pool is inherit from threadpool, used in handle read to deal with     receive data
...; 
startaccept(); 
}
LocalTcpServer::Accept()
{
session* pSession = new session(acceptor->get_io_service, pool);
acceptor.async_accept(session->socket, boost::bind(handle_accept, this, pSession, boost::asio::placeholder::error))
}
LocalTcpServer::handle_accept(boost::system::error_code& e; ... );
{
if(e)
{
//when app run sometime(serveral hours or days, e has always error 22, means invalid argument )
LOG_ERROR << e.message() << e.value();
delete newSession;
accept();
}
else
{
session.start();
accept();
}
}

该应用程序起初工作正常，但有时，可能会在几个小时内，1 或两天后，错误来了，hander_accpte总是得到一个错误的、无效的参数。 所以，没有新的连接，

套接字连接几乎是10000，文件打开限制是65535， 并且我使用netstat检查插座是否正常关闭，没有关闭的插座 我想知道为什么会发生错误，我该如何解决它， 或者如果我的代码有一些错误？ 我希望我把这个问题描述清楚。谢谢。