From f7d87aa433d344f5db0201aca047a987cba3a0af Mon Sep 17 00:00:00 2001
From: Dan Smith <dansmith@redhat.com>
Date: Thu, 2 Jun 2022 11:08:32 -0700
Subject: [PATCH] Capture QEMU core dumps when possible

Some of the hardest-to-debug issues are qemu crashes deep in a nova
workflow that can't be reproduced locally. This adds a post task to
the playbook so that we capture the most recent qemu core dump, if
there is one.

Change-Id: I48a2ea883325ca920b7e7909edad53a9832fb319
---
 .zuul.yaml          | 1 +
 playbooks/post.yaml | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/.zuul.yaml b/.zuul.yaml
index 001ac84f12..fdcee59bc5 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -377,6 +377,7 @@
         '{{ devstack_log_dir }}/devstacklog.txt.summary': logs
         '{{ devstack_log_dir }}/tcpdump.pcap': logs
         '{{ devstack_log_dir }}/worlddump-latest.txt': logs
+        '{{ devstack_log_dir }}/qemu.coredump': logs
         '{{ devstack_full_log}}': logs
         '{{ stage_dir }}/verify_tempest_conf.log': logs
         '{{ stage_dir }}/performance.json': logs
diff --git a/playbooks/post.yaml b/playbooks/post.yaml
index d8d5f6833c..0047d78ea5 100644
--- a/playbooks/post.yaml
+++ b/playbooks/post.yaml
@@ -17,6 +17,12 @@
         dest: "{{ stage_dir }}/verify_tempest_conf.log"
         state: hard
       when: tempest_log.stat.exists
+    - name: Capture most recent qemu crash dump, if any
+      shell:
+        executable: /bin/bash
+        cmd: |
+          coredumpctl -o {{ devstack_log_dir }}/qemu.coredump dump /usr/bin/qemu-system-x86_64
+      ignore_errors: yes
   roles:
     - export-devstack-journal
     - apache-logs-conf