Investigation of Linux freezes #3.

chronos/transports/stream.nim

@@ -274,12 +274,15 @@ proc failPendingWriteQueue(queue: var Deque[StreamVector],
       vector.writer.fail(error)
 
 proc clean(server: StreamServer) {.inline.} =
+  echo "cleaning server instance"
   if not(server.loopFuture.finished()):
+    echo "cleaning server complete()"
     untrackServer(server)
     server.loopFuture.complete()
     if not isNil(server.udata) and GCUserData in server.flags:
       GC_unref(cast[ref int](server.udata))
     GC_unref(server)
+  echo "clean server exit"
 
 proc clean(transp: StreamTransport) {.inline.} =
   if not(transp.future.finished()):
@@ -1639,9 +1642,8 @@ proc close*(server: StreamServer) =
   ## Please note that release of resources is not completed immediately, to be
   ## sure all resources got released please use ``await server.join()``.
   proc continuation(udata: pointer) {.gcsafe.} =
-    # Stop tracking server
-    if not(server.loopFuture.finished()):
-      server.clean()
+    echo "server close() continuation"
+    server.clean()
 
   let r1 = (server.status == ServerStatus.Stopped) and
             not(isNil(server.function))