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Description of problem:
Using blockdev --report on /dev/loopX fails with ioctl error

$ sudo blockdev --report /dev/loop0
RO    RA   SSZ   BSZ   StartSec            Size   Device
blockdev: ioctl error on /dev/loop0

It also fails with /dev/pmemX devices, which are making their way upstream
and hopefully into RHEL7.3.


Version-Release number of selected component (if applicable):

util-linux-2.23.2-16.el7.x86_64


How reproducible:
Very.

Steps to Reproduce:
1.mount an iso with -o loop
2.run blockdev --report
3.

Actual results:
$ sudo blockdev --report /dev/loop0
RO    RA   SSZ   BSZ   StartSec            Size   Device
blockdev: ioctl error on /dev/loop0


Expected results:
$ sudo blockdev --report /dev/loop0
RO    RA   SSZ   BSZ   StartSec            Size   Device
rw   256   512  2048          0       911212544   /dev/loop0


Additional info:

The actual expected results comes from a Fedora 21 system where this works.
Fedora 21 has util-linux-2.24.2-2.fc20.x86_64.
Perhaps it was fixed with this:
http://www.spinics.net/lists/util-linux-ng/msg08485.html

I only marked this as Medium severity because I don't know who uses this command but someone should check that.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2093.html