kdump_pre not working with nfs share

Issue

Testing in RHEL 6.5 server VMware instance - kdump is not dumping vmcore when kdump_pre is specified in /etc/kdump.conf. When testing with exact same setup except kdump_pre is commented out in /etc/kdump.,conf and dump img is rebuilt - crash dump works fine.

Kernel: 2.6.32-431.el6.x86_64

Please assist in obtaining more detailed logging to find out why kdump_pre is not functioning as expected.

Additional Notes:

[root@rh65-a ~]# cat /var/crash/scripts/kdump-pre.sh 
#!/bin/msh
find /var/crash -name \*core\* -exec rm -rf {} \;
exit 0

The script has perms 755

And there are indeed core files in the /var/crash dir - they remain after the attempt.