Comment 9 for bug 1648885

Starting to see this against the stable branches for Nova for some reason with 6 hits in the last two days :

http://logstash.openstack.org/#dashboard/file/logstash.json?query=(message%3A%5C%22TestVolumeBootPatternV2%5C%22%20OR%20message%3A%5C%22TestVolumeBootPattern%5C%22)%20AND%20message%3A%5C%22Delete%20snapshot%20failed%2C%20due%20to%20snapshot%20busy.%5C%22%20AND%20tags%3A%5C%22screen-c-vol.txt%5C%22

For example :

http://logs.openstack.org/26/408826/2/check/gate-tempest-dsvm-full-devstack-plugin-ceph-ubuntu-xenial/51c28af/logs/screen-c-vol.txt.gz?level=ERROR#_2017-01-04_16_43_57_603

That appears to be due to the following calls racing as previously discussed in this bug :

req-0efd714f

http://logs.openstack.org/26/408826/2/check/gate-tempest-dsvm-full-devstack-plugin-ceph-ubuntu-xenial/51c28af/logs/screen-c-api.txt.gz#_2017-01-04_16_43_56_203

req-63845b69

http://logs.openstack.org/26/408826/2/check/gate-tempest-dsvm-full-devstack-plugin-ceph-ubuntu-xenial/51c28af/logs/screen-c-api.txt.gz#_2017-01-04_16_43_56_945

Any idea why we are not seeing this against master at the moment?