1. Run sssd as "/usr/sbin/sssd -i -f -d9".

2. Relevant sssd.conf domain section:
[domain/default]
debug_level = 9
id_provider = ldap
ldap_uri = ldap://cobra.lab.eng.pnq.redhat.com
ldap_search_base = dc=example,dc=com
#auth_provider = ldap
#ldap_tls_cacert = /etc/openldap/cacerts/cacert.asc
auth_provider = krb5
krb5_server = cobra.lab.eng.pnq.redhat.com
krb5_realm = EXAMPLE.COM
krb5_lifetime = 120
krb5_renew_interval = 10
krb5_renewable_lifetime = 150m
krb5_ccname_template = FILE:%d/krb5cc_%u
krb5_ccachedir = /tmp/krb5_cache

3. Auth as a kerberos user.

Result:
No crash seen. TGT renewals are successful.

Verified in version:
# rpm -qi sssd | head
Name        : sssd                         Relocations: (not relocatable)
Version     : 1.5.1                             Vendor: Red Hat, Inc.
Release     : 34.el5                        Build Date: Tue 03 May 2011 10:46:07 PM IST
Install Date: Tue 10 May 2011 01:20:13 AM IST      Build Host: x86-003.build.bos.redhat.com
Group       : Applications/System           Source RPM: sssd-1.5.1-34.el5.src.rpm
Size        : 3486753                          License: GPLv3+
Signature   : (none)
Packager    : Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>
URL         : http://fedorahosted.org/sssd/
Summary     : System Security Services Daemon

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-0975.html