[Bug 1962038] Re: wrong sysrq value in /usr/lib/sysctl.d/50-default.conf

[Brian Murray]

Hello Steve, or anyone else affected,

Accepted systemd into impish-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/systemd/248.3-1ubuntu8.5 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
impish to verification-done-impish. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-impish. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Tags removed: verification-done-impish
** Tags added: verification-needed-impish

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https://bugs.launchpad.net/bugs/1962038

Title:
  wrong sysrq value in /usr/lib/sysctl.d/50-default.conf

Status in procps package in Ubuntu:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released
Status in procps source package in Impish:
  Won't Fix
Status in systemd source package in Impish:
  Fix Committed
Status in procps source package in Jammy:
  Fix Released
Status in systemd source package in Jammy:
  Fix Released

Bug description:
  [Impact]

  I've just learned that systemd is setting kernel.sysrq to 16 in
  /usr/lib/sysctl.d/50-default.conf.  This is inconsistent with
  /etc/sysctl.d/10-magic-sysrq.conf which intentionally sets it to 176
  by default.  systemd should drop its setting to defer to the file that
  we have been carrying in procps for a very long time.

  Therefore, users can only sync their storage but not do any other
  actions using the magic sysrq key.

  [Test Plan]

  $ sysctl kernel.sysrq
  => This should show "kernel.sysrq = 176" as set by /etc/sysctl.d/10-magic-sysrq.conf
  $ sysctl net.ipv4.conf.all.rp_filter
  => This should show "net.ipv4.conf.all.rp_filter=2" as set by /etc/sysctl.d/10-network-security.conf

  [Where problems could occur]

   * This patch changes systemd's sysctl configuration in /lib/sysctl.d/*.conf
   * If something is broken it could fail to apply any of systemd's sysctl configuration, but Ubuntu's defaults from /etc/sysctl.d/*.conf would still be in place.

  [Other Info]
   
   * None

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