Comment 3 for bug 1186155

Tested locally with CentOS 6.4

[root@dhcppc4 ~]# rpm -qa | grep mysql
mysql-libs-5.5.31-1.el6.remi.x86_64
compat-mysql51-5.1.54-1.el6.remi.x86_64

[root@dhcppc4 ~]# rpm -qa | grep Percona
Percona-Server-client-55-5.5.30-rel30.2.509.rhel6.x86_64
Percona-Server-shared-55-5.5.30-rel30.2.509.rhel6.x86_64
Percona-Server-server-55-5.5.30-rel30.2.509.rhel6.x86_64
[root@dhcppc4 ~]#

[root@dhcppc4 ~]# yum --enablerepo=percona upgrade
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: centos.aol.in
 * epel: epel.mirror.net.in
 * extras: centos.aol.in
 * updates: centos.aol.in
Setting up Upgrade Process
Resolving Dependencies
--> Running transaction check
---> Package Percona-Server-client-55.x86_64 0:5.5.30-rel30.2.509.rhel6 will be updated
---> Package Percona-Server-client-55.x86_64 0:5.5.32-rel31.0.549.rhel6 will be an update
---> Package Percona-Server-server-55.x86_64 0:5.5.30-rel30.2.509.rhel6 will be updated
---> Package Percona-Server-server-55.x86_64 0:5.5.32-rel31.0.549.rhel6 will be an update
---> Package Percona-Server-shared-51.x86_64 0:5.1.70-rel14.8.580.rhel6 will be obsoleting
---> Package Percona-Server-shared-55.x86_64 0:5.5.30-rel30.2.509.rhel6 will be updated
---> Package Percona-Server-shared-55.x86_64 0:5.5.32-rel31.0.549.rhel6 will be obsoleting
---> Package Percona-Server-shared-56.x86_64 0:5.6.12-rc60.4.393.rhel6 will be obsoleting
---> Package Percona-Server-shared-compat.x86_64 0:5.5.32-rel31.0.549.rhel6 will be obsoleting
---> Package Percona-XtraDB-Cluster-shared.x86_64 1:5.5.31-23.7.5.438.rhel6 will be obsoleting
---> Package mysql-libs.x86_64 0:5.5.31-1.el6.remi will be obsoleted
---> Package tzdata.noarch 0:2013c-1.el6 will be updated
---> Package tzdata.noarch 0:2013c-2.el6 will be an update
--> Processing Conflict: Percona-Server-shared-56-5.6.12-rc60.4.393.rhel6.x86_64 conflicts Percona-Server-shared-55
--> Processing Conflict: 1:Percona-XtraDB-Cluster-shared-5.5.31-23.7.5.438.rhel6.x86_64 conflicts Percona-Server-shared-55
--> Finished Dependency Resolution
Error: Percona-XtraDB-Cluster-shared conflicts with Percona-Server-shared-55-5.5.32-rel31.0.549.rhel6.x86_64
Error: Percona-Server-shared-56 conflicts with Percona-Server-shared-55-5.5.32-rel31.0.549.rhel6.x86_64
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest
[root@dhcppc4 ~]#

While original conflict is not repeatable with recent repo, tried to upgrade from 5.5.30 to 5.5.32 but still does not work because of these weird RPMs from cluster and 5.6.