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From: jcmalek@lakeheadu.ca
To: poky@lists.yoctoproject.org
Subject: stdout overwriting logger output for service units
Date: Wed, 23 Nov 2022 09:08:40 -0800	[thread overview]
Message-ID: <oy3w.1669223320962012665.WVBs@lists.yoctoproject.org> (raw)

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Hi there Poky team,

I have recently noticed that some of the stdout output has been overwriting the logger output when I do a "journalctl -u service_name" on any of the services. The systemd team has referred me to this project (my downstream distro) to look into the issue before they are willing to have a look. They would ideally like this tested on a newer version of systemd. The steps to reproduce the problem are fairly simple. I have hopefully included all the relevant details below. Please let me know if there is anything else you need.

systemd version the issue has been seen with
--------------------------------------------

246

Used distribution
-----------------

Poky (Yocto Project Reference Distro) 3.2.4 \n \l

Linux kernel version used
-------------------------

5.12.10

CPU architectures issue was seen on
-----------------------------------

arm

Component
---------

journalctl

Expected behaviour you didn't see
---------------------------------

Expected both logger and standard output to appear in service unit logs:

journalctl -f -u test
Nov 16 15:05:08 c-00012 sh[1617]: Standard output: 1
Nov 16 15:05:08 c-00012 root[1650]: Logger: 1
Nov 16 15:05:08 c-00012 sh[1617]: Standard output: 2
Nov 16 15:05:08 c-00012 root[1652]: Logger: 2
Nov 16 15:05:09 c-00012 sh[1617]: Standard output: 3
Nov 16 15:05:09 c-00012 root[1654]: Logger: 3
Nov 16 15:05:10 c-00012 sh[1617]: Standard output: 4
Nov 16 15:05:10 c-00012 root[1656]: Logger: 4
Nov 16 15:05:11 c-00012 sh[1617]: Standard output: 5
Nov 16 15:05:11 c-00012 root[1658]: Logger: 5

Unexpected behaviour you saw
----------------------------

I only get the standard output messages and every once and a while one of the logger messages sneaks through:

journalctl -f -u test
Nov 16 15:05:08 c-00012 sh[1617]: Standard output: 1
Nov 16 15:05:08 c-00012 sh[1617]: Standard output: 2
Nov 16 15:05:09 c-00012 sh[1617]: Standard output: 3
Nov 16 15:06:09 c-00012 root[1654]: Logger: 3
Nov 16 15:05:10 c-00012 sh[1617]: Standard output: 4
Nov 16 15:05:11 c-00012 sh[1617]: Standard output: 5

Steps to reproduce the problem
------------------------------

test.service contents:

[Unit]
Description=Test
DefaultDependencies=no

[Service]
Type=oneshot
ExecStart=/bin/sh /mytest.sh
RemainAfterExit=yes

/mytest.sh contents:

#!/bin/sh
i=0
while [ $i -le 100 ]; do
 echo "Standard output: ${i}"
 logger "Logger: ${i}"
 sleep 1
 i=$((i+1))
done

* journalctl -f -u test
* systemctl start test

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next             reply	other threads:[~2022-11-23 17:08 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-23 17:08 jcmalek [this message]
2022-11-30  2:01 ` [poky] stdout overwriting logger output for service units Khem Raj
2022-12-06 20:38   ` jcmalek

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