fix situation were error happened before lock was released

awx/main/tasks.py

@@ -2246,6 +2246,8 @@ class RunProjectUpdate(BaseTask):
             copy_tree(project_path, destination_folder)
 
     def post_run_hook(self, instance, status):
+        # To avoid hangs, very important to release lock even if errors happen here
+        try:
             if self.job_private_data_dir:
                 # copy project folder before resetting to default branch
                 # because some git-tree-specific resources (like submodules) might matter
@@ -2261,6 +2263,7 @@ class RunProjectUpdate(BaseTask):
                     except Exception:
                         # this could have failed due to dirty tree, but difficult to predict all cases
                         logger.exception('Failed to restore project repo to prior state after {}'.format(instance.log_format))
+        finally:
             self.release_lock(instance)
         p = instance.project
         if self.playbook_new_revision: