This morning my imap server dovecot stopped working.  The only thing
that changed was krb5/keyutils updates.  

Here is the error message from /var/log/maillog

Nov 21 10:32:11 hopf dovecot: imap-login: imap-login: error while loading shared libraries: libsepol.so.1: failed to map segment from shared object: Cannot allocate memory
Nov 21 10:32:11 hopf dovecot: child 3550 (login) returned error 127
Nov 21 10:32:11 hopf dovecot: child 3551 (login) returned error 127

This is an X86_64 system.  The only dovecot installed is
dovecot-1.0-1.2.rc15.el5.x86_64

Here is the output of "yum list libsepol*"

Installed Packages
libsepol.x86_64                          1.15.2-1.el5           installed       
libsepol.i386                            1.15.2-1.el5           installed       
libsepol-devel.x86_64                    1.15.2-1.el5           installed       

Here are the things that changed last night (from yum.log)
Nov 21 05:47:59 Installed: keyutils-libs.i386 1.2-1.el5
Nov 21 05:48:02 Updated: krb5-libs.i386 1.6.1-17.el5
Nov 21 05:48:03 Installed: keyutils-libs.x86_64 1.2-1.el5
Nov 21 05:48:04 Updated: krb5-libs.x86_64 1.6.1-17.el5
Nov 21 05:48:05 Installed: keyutils-libs-devel.x86_64 1.2-1.el5
Nov 21 05:48:07 Updated: krb5-devel.i386 1.6.1-17.el5
Nov 21 05:48:09 Updated: krb5-devel.x86_64 1.6.1-17.el5
Nov 21 05:48:13 Updated: krb5-workstation.x86_64 1.6.1-17.el5