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Created attachment 1281317 [details]
script to replicate the error

Description of problem:

There's an issue with sudo, that is truncating output in stdout file descriptor upon log_output (io logging) option usage.

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

Affected and tested versions:
* RHEL6 sudo-1.8.6p3-25.el6_8.x86_64 rpm
* RHEL7 sudo-1.8.6p7-21.el7_3.x86_64 rpm
* RHEL7 sudo-1.8.19p2-1.el7_3.x86_64 BETA rpm

NOT Affected version:
* RHEL6 upstream sudo-1.8.20-1.el6.x86_64 rpm (http://ftp.sudo.ws/pub/sudo/packages/Centos/6/sudo-1.8.20-1.el6.x86_64.rpm)


How reproducible:
Always

Steps to Reproduce:

Just run this script (also attacched):

#!/bin/bash
printf "usqpsinfra1\nusqpsinfra2\n" | while read node; do sudo echo $node; done

Actual results:
only usqpsinfra1 is outputted:

$ bash -x test
+ read node
+ printf 'usqpsinfra1\nusqpsinfra2\n'
+ sudo echo usqpsinfra1
usqpsinfra1
+ read node
$

Expected results:
$ bash -x test
+ read node
+ printf 'usqpsinfra1\nusqpsinfra2\n'
+ sudo echo usqpsinfra1
usqpsinfra1
+ read node
+ sudo echo usqpsinfra2
usqpsinfra2
+ read node
$

Created attachment 1281318 [details]
Tests failed on RHEL6

Created attachment 1281319 [details]
Tests passed on RHEL6 + upstream sudo

Created attachment 1281320 [details]
Tests failes on RHEL7

Created attachment 1281321 [details]
Tests failed on RHEL7 + passed with upstream sudo

Outputting to STDERR the issue is not present:

$ cat test
#!/bin/bash -x
printf "usqpsinfra1\nusqpsinfra2\n" | while read node; do sudo echo $node; done
printf "usqpsinfra1err\nusqpsinfra2err\n" | while read node; do sudo echo $node 0>&1; done

$ ./test
+ printf 'usqpsinfra1\nusqpsinfra2\n'
+ read node
+ sudo echo usqpsinfra1
usqpsinfra1
+ read node #### <--- MISSING usqpsinfra2
+ read node
+ printf 'usqpsinfra1err\nusqpsinfra2err\n'
+ sudo echo usqpsinfra1err
usqpsinfra1err
+ read node
+ sudo echo usqpsinfra2err
usqpsinfra2err
+ read node
$

This looks like the upstream bug:
https://bugzilla.sudo.ws/show_bug.cgi?id=786

Created attachment 1281364 [details]
proposed patch

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-2018:0824