"found uncontrolled kernel object <object> in /sys/kernel/dlm" when stopping cman in RHEL 5

Issue

• groupd prints a message about an uncontrolled dlm kernel object when stopping cman

  Apr 13 17:02:41 node1 groupd[6827]: found uncontrolled kernel object rgmanager in /sys/kernel/dlm
  Apr 13 17:02:41 node1 groupd[6827]: found uncontrolled kernel object clvmd in /sys/kernel/dlm
  Apr 13 17:02:41 node1 groupd[6827]: local node must be reset to clear 2 uncontrolled instances of gfs and/or dlm

• A cluster node is killed after the above uncontrolled object messages:

  Apr 13 17:02:41 node1 openais[6814]: [CMAN ] cman killed by node 1 because we were killed by cman_tool or other application

• I cannot restart cman on a node without rebooting it