Fix UNKNOWN(Zombie) Process in unexpected processes check

azurelinuxagent/common/cgroupconfigurator.py

@@ -650,8 +650,9 @@ def _check_processes_in_agent_cgroup(self):
                     current = process
                     while current != 0 and current not in agent_commands:
                         current = self._get_parent(current)
-                    # Process started by agent will have a marker and check if that marker found in process environment.
-                    if current == 0 and not self.__is_process_descendant_of_the_agent(process):
+                    # Verify if Process started by agent based on the marker found in process environment or process is in Zombie state.
+                    # If so, consider it as valid process in agent cgroup.
+                    if current == 0 and not (self.__is_process_descendant_of_the_agent(process) or self.__is_zombie_process(process)):
                         unexpected.append(self.__format_process(process))
                         if len(unexpected) >= 5:  # collect just a small sample
                             break
@@ -704,6 +705,23 @@ def __is_process_descendant_of_the_agent(pid):
                 pass
             return False
 
+        @staticmethod
+        def __is_zombie_process(pid):
+            """
+            Returns True if process is in Zombie state otherwise False.
+
+            Ex: cat /proc/18171/stat
+            18171 (python3) S 18103 18103 18103 0 -1 4194624 57736 64902 0 3
+            """
+            try:
+                stat = '/proc/{0}/stat'.format(pid)
+                if os.path.exists(stat):
+                    with open(stat, "r") as stat_file:
+                        return stat_file.read().split()[2] == 'Z'
+            except Exception:
+                pass
+            return False
+
         @staticmethod
         def _check_agent_throttled_time(cgroup_metrics):
             for metric in cgroup_metrics: