fix: make sure spawnerrors are detected for spawn childs

Author: Michael Hammann

supervisor/rpcinterface.py

@@ -297,7 +297,12 @@ def startProcess(self, name, wait=True):
                         if child.state is not (ProcessStates.STARTING or ProcessStates.RUNNING):
                             self.startProcess(child.group.config.name + ':' + child.config.name)
                         else:
+                            self.supervisord.reap()
+                            if child.spawnerr:
+                                child.state = ProcessStates.FATAL
+                                raise RPCError(Faults.SPAWN_ERROR, name)
                             child.transition()
+
                             msg = ("waiting on dependee process {} to reach running state - currently in {}"
                             .format(child.config.name, getProcessStateDescription(child.state)))
                             self.supervisord.options.logger.warn(msg)