Comment 3 for bug 1362347

While I was looking at these failures I noticed that they only occurred with mysql as a db backend.
There are not enough data points to confirm this, but probably the root cause might have something to do either with the DBMS itself, with python-mysqldb, or with the sqlalchemy backend for mysql.

Or this might be a red herring and it's just neutron exhausting memory.

However, oom usually occur 30 to 40 minutes into the test runs. Tempest runs usually last more. Consider this is not a frequent failure, if it was a progressive memory leak due to system load it oom messages should have occurred closer to the end of the test.