This occurred after stopping the cluster via Luci and then start via Luci:
kernel: clurgmgrd[22367]: segfault at 0000000000000048 rip
0000000000419804 rsp 0000000041401030 error 4
5.1 Beta RPMs:
rgmanager-2.0.28-1.el5
cman-2.0.70-1.el5
kernel-2.6.18-36.el5