Duplicate entries in /proc/mounts and /etc/mtab for "mount -o bind"

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Issue

In case of running multiple times same command mount -o bind, duplicate lines are added in files /proc/mounts and /etc/mtab. Also, mount reports duplicate mounts.
For umount, it is needed as many umounts as mounts were performed for same mount point.

Environment

Red Hat Enterprise Linux (RHEL) 5, 6

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