pam_krb5 logs a couple of debug messages (at LOG_DEBUG) even when debugging is not enabled. The crond global debug() function overrides this with a different priority, but pam_krb5 still needs to not try to spew stuff at syslog unless it's been configured to do so.
Fixing both of these problems (fix the code, link with -Bsymbolic) for pam_krb5-2.2.5 and pam_krb5-2.1.14.