Created attachment 518582 [details]
full error trace from script

Description of problem:
I'm using python-bugzilla from EPEL 6 on RHEL 6.  I'm trying to do a search for all bugs that block a particular bug that have not been cloned.  So I first do a search like this to get the list of blocker bugs:

from bugzilla import Bugzilla

bzurl = 'https://bugzilla.redhat.com/xmlrpc.cgi'
bz = Bugzilla(url=bzurl)
query = {'blocked': bugnum}
bugs = bz.query(query)

Then, for each bug in bugs, I try to see if any other bug has it listed as a clone:
for bug in bugs:
    query = {'clone_of': bug.bug_id}
    bugs = bz.query(query)

at some point this fails with the attached error.  The salient error seems to be this:
DBD::mysql::st execute failed: Error writing file \'/var/tmp/mysql_tmpfs/MY2NFodz\' (Errcode: 28)

which seems to indicate not enough space on /var/tmp/mysql_tmpfs to write some file.

As you can see from the attachment, clone is not mentioned anywhere in the sql statement, and in general, the sql statement looks wrong.

If you could provide instructions about how I could use some sort of scripting interface to find out which bugs are clones of specified bugs, that would be great.