id summary reporter owner description type status milestone component version severity resolution keywords cc 11351 boost::asio::ip::tcp::acceptor::open crash under win x64 with Boost.Context/Coroutine 348944179@… olli "using boost::asio::ip::tcp; ... boost::asio::io_service ios; boost::asio::spawn(ios, [](boost::asio::yield_context yield){ ... tcp::acceptor acpr(ios); tcp::resolver rsv(ios); tcp::resolver::query qry(""0.0.0.0"", ""23333""); tcp::resolver::iterator itr = rsv.resolve(qry); tcp::endpoint ep = *itr; acpr.open(ep.protocol()); // this will crash!! ... }); If above code not running in a coroutine, but a thread(like main thread), acpr.open(ep.protocol()); will be ok. I tested vc9(vs2008) and vc12(vs2013) x64 under Win7 and Win8.1, all the same(include boost 1.57 and 1.58). Below code come from Boost.Asio example (cpp11) spawn: http://www.boost.org/doc/libs/1_58_0/doc/html/boost_asio/example/cpp11/spawn/echo_server.cpp Run this example code, same error will raise." Bugs closed To Be Determined context Boost 1.57.0 Problem worksforme