From 1fb890f4ebe76816fe3b8fb7fc70b938bd942f2b Mon Sep 17 00:00:00 2001
From: Ryan Petrello <rpetrell@redhat.com>
Date: Wed, 6 Dec 2017 11:27:07 -0500
Subject: [PATCH] fix a race condition in "host.last_job" when jobs are deleted

see: https://github.com/ansible/ansible-tower/issues/7815
---
 awx/main/signals.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/awx/main/signals.py b/awx/main/signals.py
index 1936f96c76..aa5266d31a 100644
--- a/awx/main/signals.py
+++ b/awx/main/signals.py
@@ -296,7 +296,12 @@ def _update_host_last_jhs(host):
     except IndexError:
         jhs = None
     update_fields = []
-    last_job = jhs.job if jhs else None
+    try:
+        last_job = jhs.job if jhs else None
+    except Job.DoesNotExist:
+        # The job (and its summaries) have already been/are currently being
+        # deleted, so there's no need to update the host w/ a reference to it
+        return
     if host.last_job != last_job:
         host.last_job = last_job
         update_fields.append('last_job')