commit 73cc85d910660e749354f0ad6c305199f68b0277
Author: Federico Ressi <fressi@redhat.com>
Date:   Wed Sep 9 15:24:30 2020 +0200

    Log stack trace when fails launching a defined domain
    
    Change-Id: I5165cebf8928c2214e28c61231baca7793bb421e

diff --git a/nova/tests/unit/virt/libvirt/test_guest.py b/nova/tests/unit/virt/libvirt/test_guest.py
index 3cab237..bbf35f0 100644
--- a/nova/tests/unit/virt/libvirt/test_guest.py
+++ b/nova/tests/unit/virt/libvirt/test_guest.py
@@ -80,7 +80,7 @@ class GuestTestCase(test.NoDBTestCase):
         self.domain.createWithFlags.assert_called_once_with(
             fakelibvirt.VIR_DOMAIN_START_PAUSED)
 
-    @mock.patch.object(libvirt_guest.LOG, 'error')
+    @mock.patch.object(libvirt_guest.LOG, 'exception')
     @mock.patch.object(encodeutils, 'safe_decode')
     def test_launch_exception(self, mock_safe_decode, mock_log):
         fake_xml = '<test>this is a test</test>'
diff --git a/nova/virt/libvirt/guest.py b/nova/virt/libvirt/guest.py
index eb0ca35..c6d05ab 100644
--- a/nova/virt/libvirt/guest.py
+++ b/nova/virt/libvirt/guest.py
@@ -155,9 +155,8 @@ class Guest(object):
             return self._domain.createWithFlags(flags)
         except Exception:
             with excutils.save_and_reraise_exception():
-                LOG.error('Error launching a defined domain '
-                          'with XML: %s',
-                          self._encoded_xml, errors='ignore')
+                LOG.exception('Error launching a defined domain with XML: %s',
+                              self._encoded_xml, errors='ignore')
 
     def poweroff(self):
         """Stops a running guest."""