https://svn.boost.org/trac10/ticket/4428 <p> when you use a USB-Serial Port convertor and when use a async_write to send a large buffer to Serial Port,at the time of sending data, you pull out the USB-Serail Port Convertor from computer. the async call back handler for sending and receiving will not get a error and the io_service can't be delete. </p> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/4428 Trac 1.4.3