[Touch-packages] [Bug 1722481] Re: systemd should sync disks, before killing all processes on shutdown

[Xeletron]

Is it possible this bug returned in ubuntu 21.04 - hirsute? see my
systemd-shutdown in the txt file attached. ..or is a workaround possible
for this?

I notice this behavior when i shutdown and reboot. the laptop needs
almost no time to shutdown, and then for 20 maybe 30 seconds the
plymouth screen comes back with the rotating sign, waiting to sync
probably, then the screen goes black and shutdown.

** Attachment added: "last view lines of journalctl-shutdown"
   
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1722481/+attachment/5504055/+files/journalctl-shutdown.txt

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Title:
  systemd should sync disks, before killing all processes on shutdown

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

Bug description:
  [Impact]

   * systemd-shutdown binary is executed to complete system shutdown. In
  xenial, it calls sync() after killing all processes, and not before
  killing them. This means that processes are racing the SIGKILL/TERM
  timeouts to sync all IO to disk. To mitigate this race condition, and
  make the shutdown process more reliable the sync() should also happen
  before process killing spree starts.

  [Fix]
  Backport upstream commit 
https://github.com/systemd/systemd/commit/2e79d1828a8da9b3af1b052297e3617905ec94f3

  
  [Test Case]

   * Make sure systems still shuts down, including e.g. root on raid.

  [Regression Potential]

   * Shutdowns may appear to be slower due to two sync() calls instead of one
   * However total shutdown time should not be impacted much, as there really 
should not be much additional IO caused by killing all processes.

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[Touch-packages] [Bug 1722481] Re: systemd should sync disks, before killing all processes on shutdown

[Launchpad Bug Tracker]

This bug was fixed in the package systemd - 229-4ubuntu21.2

---
systemd (229-4ubuntu21.2) xenial; urgency=medium

  [ Dimitri John Ledkov ]
  * udev: Mark ndb devices as inactive until connected. (LP: #696435)
  * networkd: in dhcp, change UseMTU default to true, to accept DHCP provided 
MTU by default.
(LP: #1717471)
  * sysctl: apply parameters in-order, instead of randomly. (LP: #1718444)
  * networkd: apply promote_secondaries, to make DHCP lease changes work.
(LP: #1721223)
  * shutdown: sync filesystems, before going into a killing spree.
(LP: #1722481)
  * sysctl: do not fail, when cannot apply sysctl changes due to read-only 
sysfs in containers.
(LP: #1734409)
  * networkd,wait-online: add RequiredForOnline to mark mandatory/optional 
links for boot.
(LP: #1737570)

  [ David Glasser ]
  * journald: don't reduce BurstRateLimit on low disk space (LP: #1732803)

 -- Dimitri John Ledkov   Wed, 21 Feb 2018 13:46:37
+

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

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You received this bug notification because you are a member of Ubuntu
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https://bugs.launchpad.net/bugs/1722481

Title:
  systemd should sync disks, before killing all processes on shutdown

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

Bug description:
  [Impact]

   * systemd-shutdown binary is executed to complete system shutdown. In
  xenial, it calls sync() after killing all processes, and not before
  killing them. This means that processes are racing the SIGKILL/TERM
  timeouts to sync all IO to disk. To mitigate this race condition, and
  make the shutdown process more reliable the sync() should also happen
  before process killing spree starts.

  [Fix]
  Backport upstream commit 
https://github.com/systemd/systemd/commit/2e79d1828a8da9b3af1b052297e3617905ec94f3

  
  [Test Case]

   * Make sure systems still shuts down, including e.g. root on raid.

  [Regression Potential]

   * Shutdowns may appear to be slower due to two sync() calls instead of one
   * However total shutdown time should not be impacted much, as there really 
should not be much additional IO caused by killing all processes.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1722481/+subscriptions

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[Touch-packages] [Bug 1722481] Re: systemd should sync disks, before killing all processes on shutdown

[Dimitri John Ledkov]

As seen in autopkgtests, reboots are working correctly with filesystems
synced to disk on shutdown, without regressions in shutdown / reboot.
Thus this is sufficient to verify that the disks are still synced on
shutdown.

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

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https://bugs.launchpad.net/bugs/1722481

Title:
  systemd should sync disks, before killing all processes on shutdown

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Fix Committed

Bug description:
  [Impact]

   * systemd-shutdown binary is executed to complete system shutdown. In
  xenial, it calls sync() after killing all processes, and not before
  killing them. This means that processes are racing the SIGKILL/TERM
  timeouts to sync all IO to disk. To mitigate this race condition, and
  make the shutdown process more reliable the sync() should also happen
  before process killing spree starts.

  [Fix]
  Backport upstream commit 
https://github.com/systemd/systemd/commit/2e79d1828a8da9b3af1b052297e3617905ec94f3

  
  [Test Case]

   * Make sure systems still shuts down, including e.g. root on raid.

  [Regression Potential]

   * Shutdowns may appear to be slower due to two sync() calls instead of one
   * However total shutdown time should not be impacted much, as there really 
should not be much additional IO caused by killing all processes.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1722481/+subscriptions

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[Touch-packages] [Bug 1722481] Re: systemd should sync disks, before killing all processes on shutdown

[Brian Murray]

Hello Dimitri, or anyone else affected,

Accepted systemd into xenial-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/systemd/229-4ubuntu21.2 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 and change the tag from
verification-needed-xenial to verification-done-xenial. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-xenial. 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!

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

** Tags added: verification-needed verification-needed-xenial

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You received this bug notification because you are a member of Ubuntu
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https://bugs.launchpad.net/bugs/1722481

Title:
  systemd should sync disks, before killing all processes on shutdown

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Fix Committed

Bug description:
  [Impact]

   * systemd-shutdown binary is executed to complete system shutdown. In
  xenial, it calls sync() after killing all processes, and not before
  killing them. This means that processes are racing the SIGKILL/TERM
  timeouts to sync all IO to disk. To mitigate this race condition, and
  make the shutdown process more reliable the sync() should also happen
  before process killing spree starts.

  [Fix]
  Backport upstream commit 
https://github.com/systemd/systemd/commit/2e79d1828a8da9b3af1b052297e3617905ec94f3

  
  [Test Case]

   * Make sure systems still shuts down, including e.g. root on raid.

  [Regression Potential]

   * Shutdowns may appear to be slower due to two sync() calls instead of one
   * However total shutdown time should not be impacted much, as there really 
should not be much additional IO caused by killing all processes.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1722481/+subscriptions

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[Touch-packages] [Bug 1722481] Re: systemd should sync disks, before killing all processes on shutdown

[Dimitri John Ledkov]

** Changed in: systemd (Ubuntu Xenial)
   Status: New => In Progress

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/1722481

Title:
  systemd should sync disks, before killing all processes on shutdown

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  In Progress

Bug description:
  [Impact]

   * systemd-shutdown binary is executed to complete system shutdown. In
  xenial, it calls sync() after killing all processes, and not before
  killing them. This means that processes are racing the SIGKILL/TERM
  timeouts to sync all IO to disk. To mitigate this race condition, and
  make the shutdown process more reliable the sync() should also happen
  before process killing spree starts.

  [Fix]
  Backport upstream commit 
https://github.com/systemd/systemd/commit/2e79d1828a8da9b3af1b052297e3617905ec94f3

  
  [Test Case]

   * Make sure systems still shuts down, including e.g. root on raid.

  [Regression Potential]

   * Shutdowns may appear to be slower due to two sync() calls instead of one
   * However total shutdown time should not be impacted much, as there really 
should not be much additional IO caused by killing all processes.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1722481/+subscriptions

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[Touch-packages] [Bug 1722481] Re: systemd should sync disks, before killing all processes on shutdown

[Francis Ginther]

** Tags added: id-59dba43d6e5b35acb9bbee0b

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/1722481

Title:
  systemd should sync disks, before killing all processes on shutdown

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  New

Bug description:
  [Impact]

   * systemd-shutdown binary is executed to complete system shutdown. In
  xenial, it calls sync() after killing all processes, and not before
  killing them. This means that processes are racing the SIGKILL/TERM
  timeouts to sync all IO to disk. To mitigate this race condition, and
  make the shutdown process more reliable the sync() should also happen
  before process killing spree starts.

  [Fix]
  Backport upstream commit 
https://github.com/systemd/systemd/commit/2e79d1828a8da9b3af1b052297e3617905ec94f3

  
  [Test Case]

   * Make sure systems still shuts down, including e.g. root on raid.

  [Regression Potential]

   * Shutdowns may appear to be slower due to two sync() calls instead of one
   * However total shutdown time should not be impacted much, as there really 
should not be much additional IO caused by killing all processes.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1722481/+subscriptions

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