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This bug has been copied from bug #713410 and has been proposed
to be backported to 6.1 z-stream (EUS).

Fixed in cryptsetup-luks-1.2.0-3.el6_1.2.

# cat /proc/cmdline 
ro root=/dev/mapper/vg_dellpesc142001-lv_root boot=UUID=f2e92c68-b390-44a0-8a44-c1d45c36b677 rd_LVM_LV=vg_dellpesc142001/lv_root rd_LVM_LV=vg_dellpesc142001/lv_swap rd_NO_LUKS rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYTABLE=us fips=1 console=ttyS0,115200 

# rpm -q cryptsetup-luks
cryptsetup-luks-1.2.0-3.el6.x86_64

# cryptsetup isLuks /dev/sda
Running in FIPS mode.
Device /dev/sda is not a valid LUKS device.

After update: 

# rpm -q cryptsetup-luks
cryptsetup-luks-1.2.0-3.el6_1.2.x86_64

# cryptsetup isLuks /dev/sda
Device /dev/sda is not a valid LUKS device.

# cryptsetup -v isLuks /dev/sda
Running in FIPS mode.
Device /dev/sda is not a valid LUKS device.
Command failed with code 22: Device /dev/sda is not a valid LUKS device.


"Running in FIPS mode." message is printed only in verbose mode.

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2011-0884.html