A denial of service flaw was discovered in the Condor's Schedd. A user who has permission to submit a job could do so in a way that will cause corruption of the job_queue.log file, preventing Schedd from running.
Lifting embargo: http://www.cs.wisc.edu/condor/manual/v7.0/8_3Stable_Release.html#SECTION00931000000000000000
condor-7.0.5-1.fc9 has been pushed to the Fedora 9 stable repository. If problems still persist, please make note of it in this bug report.
This issue was addressed in: Red Hat Enterprise MRG for RHEL-4: http://rhn.redhat.com/errata/RHSA-2008-0924.html Red Hat Enterprise MRG for RHEL-5: http://rhn.redhat.com/errata/RHSA-2008-0911.html Fedora: https://admin.fedoraproject.org/updates/F9/FEDORA-2008-8733