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[Launchpad Bug Tracker <1876018@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package systemd - 229-4ubuntu21.29

---------------
systemd (229-4ubuntu21.29) xenial; urgency=medium

  [ Dan Streetman ]
  * d/p/lp1881312/0001-core-don-t-dispatch-load-queue-when-setting-Slice-fo.patch,
    d/p/lp1881312/0002-run-make-slice-work-in-conjunction-with-scope.patch:
    - run new scope unit in specified slice (LP: #1881312)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=b5a778c3cd93e3d684602146f281f315f30778a8
  * d/p/lp1877176-sd-dhcp-client-validate-hostnames-stricter-7308.patch:
    - strictly validate hostname sent to dhcp server (LP: #1877176)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=7a1f1c41dcd860fcba6be42a2153cfe4315ebf17
  * d/e/rules-ubuntu/40-vm-hotadd.rules:
    - Hotadd only offline memory and CPUs
      (LP: #1876018)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=43357bd260a1c3e7b4951d33cbacaebda1d086b3
  * d/p/lp1698388-journal-remote-Ensure-reallocation-of-source-buf-doe.patch:
    - Fix assertion failure when journald source->filled < source->size
      (LP: #1698388)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=d1cc15b88113510227e5a76654e103ef54a8b8f3

  [ Heitor Alves de Siqueira ]
  * d/p/lp1876600-sd-bus-deal-with-cookie-overruns.patch:
    - deal with dbus cookie overruns (LP: #1876600)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=8dc9ef188944349169044d8974a4ffa55c66be9d

 -- Heitor Alves de Siqueira <halves@xxxxxxxxxxxxx>  Tue, 07 Jul 2020
17:28:11 -0400

** Changed in: systemd (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1876018

Title:
  40-vm-hotadd.rules attempts to set non-existent sysfs parameters

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Fix Released
Status in systemd source package in Bionic:
  Fix Released
Status in systemd source package in Focal:
  Fix Released

Bug description:
  [impact]

  40-vm-hotadd.rules unconditionally tries onlining memory, which
  results in logged error messages if the memory is already online

  [test case]

  since this rules file restricts operation to only hyper-v or xen
  guests, boot a hyper-v or xen vm guest, and check for logged error
  msgs like:

  Apr 29 22:36:46 focal01 systemd-udevd[266]: memory7:
  /usr/lib/udev/rules.d/40-vm-hotadd.rules:9 Failed to write
  ATTR{/sys/devices/system/memory/memory7/state}, ignoring: Invalid
  argument

  alternately, to test on a vm guest other than hyper-v or xen,
  comment/remove the 'GOTO="vm_hotadd_end"' line from the rules file and
  reboot.

  [regression potential]

  as this adds a check before attempting to online memory for hyper-v
  and xen vm guests, any regression would likely involve failure to
  correctly online all memory on those guest platforms.

  [scope]

  this rule has been around for a long time, so is needed for x/b/f/g.

  [original description]

  In focal, udev's 40-vm-hotadd.rules (from debian/extra/rules-ubuntu)
  tries to write to invalid (as of 5.4.0-1010-azure) sysfs nodes
  resulting in warnings such as:

  Apr 29 22:36:46 focal01 systemd-udevd[266]: memory7:
  /usr/lib/udev/rules.d/40-vm-hotadd.rules:9 Failed to write
  ATTR{/sys/devices/system/memory/memory7/state}, ignoring: Invalid
  argument

  Perhaps 40-vm-hotadd.rules needs to be updated for 5.4 semantics,
  removed, or something else. This behavior is present on systems
  upgraded from 18.04 (via d-r-u) as well as new focal systems, upon
  first reboot of the VM.

  udev: 245.4-4ubuntu3

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