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

[Nick Rosbrook]

I tested systemd 248.3-1ubuntu8.4 from impish-proposed to verify the
fix:

$ systemctl --version
systemd 248 (248.3-1ubuntu8.4)
+PAM +AUDIT +SELINUX +APPARMOR +IMA +SMACK +SECCOMP +GCRYPT +GNUTLS -OPENSSL +ACL +BLKID +CURL +ELFUTILS -FIDO2 +IDN2 -IDN +IPTC +KMOD +LIBCRYPTSETUP -LIBFDISK +PCRE2 -PWQUALITY -P11KIT -QRENCODE +BZIP2 +LZ4 +XZ +ZLIB +ZSTD -XKBCOMMON +UTMP +SYSVINIT default-hierarchy=unified

$ sysctl kernel.sysrq
kernel.sysrq = 176

$ sysctl net.ipv4.conf.all.rp_filter
net.ipv4.conf.all.rp_filter = 2


I am also currently investigating the autopkgtest regressions.

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