Comment 1 for bug 1500295

when/how this was found?

we recently saw such error on a customer env where a certain patch was introduced to Keystone. the patch is not present in any of our branches

for example, if you clone the Keystone repo, checkout the openstack-ci/fuel-6.0/2014.2 branch and search for the failing line

rgrep "user_ref\['description" .

nothing is found! So how do we see this error?

Please ensure that the problem is existing on vanilla versions first. If those lines in Keystone code were introduced by LDAP plugin, target the bug on plugin, not Heat.