Investigation of Linux freezes #1.

tests/testasyncstream.nim

@@ -625,37 +625,58 @@ suite "TLSStream test suite":
 
     proc serveClient(server: StreamServer,
                      transp: StreamTransport) {.async.} =
+      echo "server accepted client"
       var reader = newAsyncStreamReader(transp)
       var writer = newAsyncStreamWriter(transp)
       var sstream = newTLSServerAsyncStream(reader, writer, key, cert)
+      echo "server handshaking"
       await handshake(sstream)
+      echo "server handshaked"
       await sstream.writer.write(testMessage & "\r\n")
+      echo "server wrote string"
       await sstream.writer.closeWait()
+      echo "server closed secure writer"
       await sstream.reader.closeWait()
+      echo "server closed secure reader"
       await reader.closeWait()
+      echo "server closed reader"
       await writer.closeWait()
+      echo "server closed writer"
       await transp.closeWait()
+      echo "server closed transport"
       server.stop()
+      echo "server stopped server"
       server.close()
+      echo "server closed server"
 
     key = TLSPrivateKey.init(pemkey)
     cert = TLSCertificate.init(pemcert)
 
     var server = createStreamServer(address, serveClient, {ReuseAddr})
     server.start()
+    echo "server started"
     var conn = await connect(address)
+    echo "client connected"
     var creader = newAsyncStreamReader(conn)
     var cwriter = newAsyncStreamWriter(conn)
     # We are using self-signed certificate
     let flags = {NoVerifyHost, NoVerifyServerName}
     var cstream = newTLSClientAsyncStream(creader, cwriter, "", flags = flags)
+    echo "client reading line"
     let res = await cstream.reader.readLine()
+    echo "client readed line"
     await cstream.reader.closeWait()
+    echo "client closed reader"
     await cstream.writer.closeWait()
+    echo "client closed writer"
     await creader.closeWait()
+    echo "client closed creader"
     await cwriter.closeWait()
+    echo "client closed cwriter"
     await conn.closeWait()
+    echo "client closed connection"
     await server.join()
+    echo "client waited server"
     result = res == testMessage
 
   test "Simple server with RSA self-signed certificate":