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The problem seems also exists with RHEL-7 version of sudo. Please consider ot fix it.

+++ This bug was initially created as a clone of Bug #1365156 +++

Description of problem:
Customer said that when enabling sudo I/O logging the first commands executed at the same time fails with message "unable to mkdir", i.e. 

Aug  6 20:00:09 <HOSTNAME> sudo:   e6oper : unable to mkdir /var/log/sudo-io : File exists ; TTY=unknown ; PWD=/home/xxx ; USER=root ; COMMAND=/bin/su - ftpzpa --session-command -C /local/adapter/sstpat/tools/KACONSAP_I_01.sh Stop ProcessDown
Aug  6 20:00:09 <HOSTNAME> sudo:   e6oper : TTY=unknown ; PWD=/home/xxxx ; USER=root ; TSID=000001 ; COMMAND=/bin/su - ftpzpa --session-command -C /local/adapter/sstpat/tools/ECONSAP_I_01.sh Stop ProcessDown


Based on the source code, two processes possibility getting to the following point at the same time:

       if (stat(path, &sb) != 0) {
            if (mkdir(path, S_IRWXU) != 0)
                log_fatal(USE_ERRNO, _("unable to mkdir %s"), path);

(taken from plugins/sudoers/iolog.c).

Both processes verify that the directory doesn't exist, 1st process create the directory, the second process mkdir fails.

This will be fixed by the rebase in 7.4.

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://access.redhat.com/errata/RHBA-2017:2017

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://access.redhat.com/errata/RHBA-2017:2017