Why Cluster Node exporting nfs share over GFS2 crashed and produced a core?

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Issue

Cluster Node exporting nfs share over GFS2 crashed and produced a core

Environment

Red Hat Enterprise Linux Server release 6.1 (Santiago)
kernel-2.6.32-131.17.1.el6.x86_64
gfs2-utils-3.0.12-41.el6_1.2.x86_64
GFS2 Partition exported as nfs share with "rw,no_root_squash,async" arguments.

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