mount - Linux Logical Volume Manager -

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i can see single logical volume can mounted on 2 different file systems -- can explain me pros , cons of this? why doesn't linux throw error when happens?

ex: 

/dev/mapper/vgep0-lvol12 9.9g 9.2g 243m 98% /lsmw   /dev/mapper/vgep0-lvol12 9.9g 9.2g 243m 98% /oracle/ep0/oraflash

in linux device can mounted multiple times.

from mount(2) man page

since linux 2.4 single file system can visible @ multiple  mount points, , multiple mounts can stacked on same mount point.

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