Description of problem:
On my 5-nodes cluster, I'm able to mount my GFS filesystem on 4 nodes, but on
sam56, mount blocks ("ps" show it is in state "D").

My nodes are named sam12, sam16, sam17, sam56 and sam57.

Version-Release number of selected component (if applicable):
GFS-6.0.2.27-0 on 5 nodes (2 nodes are x86_64, 3 nodes are i686)

How reproducible:
Just one time. When I reboot all the cluster, it works again.

Steps to Reproduce:
1. start GFS on 5 nodes
  
Actual results:
With "gulm_tool nodelist localhost", I see:
 - that all nodes except sam56 think that
   1/ sam12 is the master
   2/ sam16, sam17, sam57 are slaves
   3/ sam56 is not in the list
  - sam56 think that sam16 is arbitrating.
sam56 is unable to mount the GFS filesystem.

Expected results:
sam56 is able to mount the GFS filesystem like others nodes.

Additional info:
in cluster.ccs:
lock_gulm {
servers=["sam12.toulouse","sam16.toulouse","sam17.toulouse","sam56.toulouse","sam57.toulouse"]