Comment 1 for bug 1591989

soo, I've got this too. Judging from the logs:

start of stack delete:

http://logs.openstack.org/96/279096/3/check/gate-heat-dsvm-functional-convg-mysql-lbaasv2/ac1c829/logs/screen-h-eng.txt.gz#_2016-06-21_09_27_44_071

failure to acquire resource lock:

http://logs.openstack.org/96/279096/3/check/gate-heat-dsvm-functional-convg-mysql-lbaasv2/ac1c829/logs/screen-h-eng.txt.gz#_2016-06-21_09_27_44_388

but right before the failure I see that there was still something going on with stack not related to delete - Setting metadata for AutoScalingPolicy "scaleup_policy":

http://logs.openstack.org/96/279096/3/check/gate-heat-dsvm-functional-convg-mysql-lbaasv2/ac1c829/logs/screen-h-eng.txt.gz#_2016-06-21_09_27_44_359

So it seems there is some race during delete in convergence engine, not all internal resource actions are stopped before the delete starts. Or, there should be a retry mechanism in these places.