cman is not starting after update to RHEL 6 Update 6 in a High Availability cluster with sctp blacklisted

Issue

When we try to start cman we get following error:

Loading kernel modules... WARNING: Error running install command for sctp
FATAL: Error inserting dlm (/lib/modules/2.6.32-504.el6.x86_64/kernel/fs/dlm/dlm.ko): Unknown symbol in module, or unknown parameter (see dmesg)

• After update to RHEL 6.6 the service cman (cluster) Failed
• cman can not start when ipv6 is blacklisted
• An HA cluster cannot start with the following errors when an IPv6 protocol is disabled.

# pcs cluster start
Starting Cluster...
Starting cluster:
     Checking if cluster has been disabled at boot... [  OK  ]
     Checking Network Manager... [  OK  ]
     Global setup... [  OK  ]
     Loading kernel modules... WARNING: Error inserting configfs
(/lib/modules/2.6.32-504.30.3.el6.x86_64/kernel/fs/configfs/configfs.ko): Unknown symbol in module, or unknown parameter (see dmesg)
FATAL: Error inserting dlm
(/lib/modules/2.6.32-504.30.3.el6.x86_64/kernel/fs/dlm/dlm.ko): Unknown symbol in module, or unknown parameter (see dmesg)
[FAILED]
Stopping cluster:
     Leaving fence domain... [  OK  ]
     Stopping gfs_controld... [  OK  ]
     Stopping dlm_controld... [  OK  ]
     Stopping fenced... [  OK  ]
     Stopping cman... [  OK  ]
     Unloading kernel modules... [  OK  ]
     Unmounting configfs... [  OK  ]
# dmesg | tail
sctp: Unknown symbol unregister_inet6addr_notifier
sctp: Unknown symbol inet6_getname
sctp: Unknown symbol ip6_xmit
sctp: Unknown symbol inet6_register_protosw
sctp: Unknown symbol icmpv6_err_convert
sctp: Unknown symbol inet6_release
sctp: Unknown symbol register_inet6addr_notifier
sctp: Unknown symbol compat_ipv6_getsockopt
sctp: Unknown symbol ipv6_chk_addr
sctp: Unknown symbol ipv6_getsockopt

• Unable to start DLM without SCTP.