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+++ This bug was initially created as a clone of Bug #1420505 +++ Description of problem: When LogLevel=debug and LogTarget=kmsg, systemd will send the message "Executing: /path/to/exececutable" to the socket that is connected to the remote client in a socket-based activation unit. Version-Release number of selected component (if applicable): systemd-219-30.el7_3.6 How reproducible: 100% Steps to Reproduce: 1. Set LogLevel=debug and LogTarget=kmsg, either through system.conf file or the kernel command-line (as described in https://freedesktop.org/wiki/Software/systemd/Debugging/) 2. Enable a socket-based service, like cups-lpd. 3. Use telnet to connect to the socket based service. Actual results: # telnet 127.0.0.1 515 Trying 127.0.0.1... Connected to 127.0.0.1. Escape character is '^]'. Executing: /usr/lib/cups/daemon/cups-lpd Expected results: The "Executing: /usr/lib/cups/daemon/cups-lpd" message should not be displayed. Additional info: This is causing a real-world problem with remote LPD clients connecting to RHEL. The "Executing..." message violates the LPD protocol as described in RFC 1179.
I reproduced this problem in Fedora 24 with systemd-229-16.fc24.x86_64: # telnet localhost 515 Trying ::1... Connected to localhost. Escape character is '^]'. cups-lpd@1-::1:515-::1:50374.service: Executing: /usr/lib/cups/daemon/cups-lpd
Submitted bug upstream: https://github.com/systemd/systemd/issues/5401
This has been fixed in systemd release 233. A backport may be appropriate.
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Fedora 24 changed to end-of-life (EOL) status on 2017-08-08. Fedora 24 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.