Kdump with NFS target does not create vmcore in Red Hat Enterprise Linux

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Issue

KDump does not produce vmcore on NFS dump target.

Environment

Red Hat Enterprise Linux 5 (update 3 or lower)
NFS configured in kdump
kexec-tools version between 1.102pre-56 and 1.102pre-92
module-init-tools version less than 3.3-0.pre3.1.54

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