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Description
On Linux, when using the examples/http server and testing it with a large number of simultaneous connections, I commonly see one thread get stuck in an infinite loop, and the server fails to accept more connections.
After stepping through the issue in lldb, I can see that the TCPListener actor gets stuck in an infinite loop when it tries to run pony_os_accept to accept a connection and that call fails with EMFILE ("too many open files") as the errno. The TCPListener is currently written to naively assume that any failure can be considered spurious, and it tries again to accept a connection. In this failure mode, trying again to accept a new connection will not help - it will always fail. Hence, it gets stuck in an infinite retry loop.