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The same issue on rhel-7.

# rpm -q blktrace
blktrace-1.0.5-6.el7.x86_64

# man blktrace | col -b | grep -- '-k'
       blktrace -d dev [ -r debugfs_path ] [ -o output ] [-k ] [ -w time ] [ -a action ] [ -A action_mask ] [ -v ]


+++ This bug was initially created as a clone of Bug #1300353 +++

Description of problem:

blktrace manpage still contains undocumented internal option -k. Option -k/--kill was removed in version 1.0.1-4 as undocumented internal option, but the removal was not complete properly. See https://bugzilla.redhat.com/show_bug.cgi?id=583624#c26.

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

blktrace-1.0.1-7.el6

How reproducible:

100%

Steps to Reproduce:

# man blktrace | col -b | grep -- '-k'
       blktrace  -d  dev [ -r debugfs_path ] [ -o output ] [-k ] [ -w time ] [

Actual results:

There is -k option in blktrace manpage.

Expected results:

There is no -k option in blktrace manpage.

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-2016-2499.html