High-frequency connect/close can crash the TCP server. 0xC0000005

[kahotv]

tcp server : echo_server.cpp

build : vs2022，Release，x86，WinSDK10.0.22621.0， /std:c++20

asio : SHA-1: https://github.com/chriskohlhoff/asio/commit/ed6aa8a13d51dfc6c00ae453fc9fb7df5d6ea963 asio version 1.34.2 released

crash when using /Ob2 and /Od Will not crash when using /Ob2 and /O2

run ProxyServer.exe（examples\cpp20\coroutines\echo_server.cpp）（crash） run ConnectClient.exe

see https://github.com/kahotv/crush_destroy_coro_3.git

ConnectClient.exe :

awaitable<void> corosleep(int ms)
{
	asio::steady_timer timer(co_await this_coro::executor);
	timer.expires_from_now(std::chrono::milliseconds(ms));
	auto [ec] = co_await timer.async_wait(as_tuple(use_awaitable));
}
awaitable<void> work(int num, int port)
{
	auto ctx = co_await this_coro::executor;
	tcp::endpoint ep({ address_v4::loopback() }, port);
	char buf[] = "abcdefg";

	std::vector<tcp::socket> v;

	for (int i = 0; i < num; i++)
	{
		tcp::socket sock(ctx);
		auto [ec] = co_await sock.async_connect(ep, as_tuple(use_awaitable));
		if (!ec)
		{
			sock.async_send(asio::buffer(buf), as_tuple(use_awaitable));
		}
		v.push_back(std::move(sock));
	}

	// close all socket
	co_await corosleep(1000);
}

int main()
{
	int num = 100;
	int port = 55555;
	asio::io_context ctx;

	co_spawn(ctx, work(num, port), detached);

	ctx.run();
	ctx.stop();
	printf("test end\n");
	system("pause");
}

[Jackarain]

This seems to be a bug in the msvc compiler, where some internal implementations of coroutines rely on the optimizer, especially features like symmetric transfer, It is recommended to always enable optimization.