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

[Lukas Märdian]

>> systemd should drop its setting to defer to the file that we have been carrying in procps for a very long time.
> 
> at some point it would be a better idea to drop the procps files and adjust the systemd defaults where/if needed. The sysctl configuration hasn't been applied by procps since upstart; with systemd, the systemd-sysctl service is what applies all the sysctl settings.

We discussed this possibility during the Foundation team's meeting. But
Steve wants to keep the policy in procps, as it has been in the past.

** Changed in: systemd (Ubuntu Jammy)
     Assignee: (unassigned) => Lukas Märdian (slyon)

** Changed in: systemd (Ubuntu Jammy)
       Status: Triaged => In Progress

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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:
  New
Status in systemd package in Ubuntu:
  In Progress
Status in procps source package in Impish:
  Won't Fix
Status in systemd source package in Impish:
  New
Status in procps source package in Jammy:
  New
Status in systemd source package in Jammy:
  In Progress

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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