Description of problem:

Test: Redhat Cluster installed and configured on both cluster nodes.  While all
resources are up (cluster was in optimal state), and IO was running from 3rd
host, run automated multi-switch ports fail.

After test has run for a few hours, immediately following a failover,  dlm will
(distributed lock manager) issue an emergency shutdown. All disk resources
associated with the cluster go into recovery. DLM prints:

lock_dlm:  Assertion failed on line 432 of file
/builddir/build/BUILD/gfs-kernel-2.6.9-75/up/src/dlm/lock.c

and the Kernel follows with:
kernel BUG in do_dlm_lock at
/builddir/build/BUILD/gfs-kernel-2.6.9-75/up/src/dlm/lock.c:432!



Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:

1) Install RedHat 4.6 on two PPC hosts
2) Install appropriate mpp and IBM client software
3) Install RedHat Cluster Suite and create resources on array
4) While IO was running from 3rd host.  Start MulitPathPortFail on Switch
(cisco9000).  Script will do:
   a) fail paths A (from host sides), 
   - sleep 600seconds, 
   - bring paths A up
   - sleep 600 seconds
   - fail paths B (from host sides)
   - sleep 600 seconds
   - bring paths B up
   - sleep 600 seconds
   - fails paths A (from array side)
   - sleep 600 seconds
   - bring paths A up
   - sleep 600 seconds
   - fails paths B (from array side)
   - sleep 600 seconds
   - bring paths B up
   - sleep 600 seconds
   - <loop back to step 4a>

  
Actual results:
After test has run for a few hours, immediately following a failover,  dlm will
(distributed lock manager) issue an emergency shutdown. All disk resources
associated with the cluster go into recovery. All cluster nodes go to mon> mode.

Expected results:
Cluste resources whouldn't go into recovery and cluster nodes shouldn't go to
mon> mode.  There shouldn't be an amergency shutdown.  There was always one path
from each cluser node, and storage array side available for redundancy, and
protect cluster nodes from loosing communication to the storage array.

Additional info:

Host information:

Kernel = Linux gonsalves 2.6.9-67.EL #1 SMP Wed Nov 7 13:50:40 EST 2007 ppc64
ppc64 ppc64 GNU/Linux
RHEL Release = Red Hat Enterprise Linux AS release 4 (Nahant Update 6)
MPP version = 09.02.B5.15
HBA model =  Emulex LP10000 2Gb PCI-X Fibre Channel Adapter on PCI bus d8 device
08 irq 343
Emulex Driver = Emulex LightPulse Fibre Channel SCSI driver 8.0.16.34
Emulex FW = 2.10 (B2F2.10X8)
EmulexBIOS = 1.50a4