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[Launchpad Bug Tracker <1578080@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package systemd - 229-6ubuntu1

---------------
systemd (229-6ubuntu1) yakkety; urgency=medium

  * Merge with Debian unstable. Remaining Ubuntu changes:
    - Hack to support system-image read-only /etc, and modify files in
      /etc/writable/ instead.

systemd (229-6) unstable; urgency=medium

  * systemd-container: Prefer renamed "btrfs-progs" package name over
    "btrfs-tools". (Closes: #822629)
  * systemd-container: Recommend libnss-mymachines. (Closes: #822615)
  * Drop systemd-dbg, in favor of debhelpers' automatic -dbgsym packages.
  * Drop Add-targets-for-compatibility-with-Debian-insserv-sy.patch; we don't
    need $x-display-manager any more as most/all DMs ship native services, and
    $mail-transport-agent is not widely used (not even by our default MTA
    exim4).
  * Unify our two patches for Debian specific configuration files.
  * Drop udev-re-enable-mount-propagation-for-udevd.patch, i. e. run udevd in
    its own slave mount name space again. laptop-mode-tools 1.68 fixed the
    original bug (#762018), thus add a Breaks: to earlier versions.
  * Ship fbdev-blacklist.conf in /lib/modprobe.d/ instead of /etc/modprobe.d/;
    remove the conffile on upgrades.
  * Replace util-Add-hidden-suffixes-for-ucf.patch with patch that got
    committed upstream.
  * Replace Stop-syslog.socket-when-entering-emergency-mode.patch with patch
    that got committed upstream.
  * debian/udev.README.Debian: Adjust documentation of MAC based naming for
    USB network cards to the udev rule, where this was moved to in 229-5.
  * debian/extra/init-functions.d/40-systemd: Invoke status command with
    --no-pager, to avoid blocking scripts that call an init.d script with
    "status" with an unexpected pager process. (Closes: #765175, LP: #1576409)
  * Add debian/extra/rules/70-debian-uaccess.rules: Make FIDO U2F dongles
    accessible to the user session. This avoids having to install libu2f-host0
    (which isn't discoverable at all) to make those devices work.
    (LP: #1387908)
  * libnss-resolve: Enable systemd-resolved.service on package installation,
    as this package makes little sense without resolved.
  * Add a DHCP exit hook for pushing received NTP servers into timesyncd.
    (LP: #1578663)
  * debian/udev.postinst: Fix migration check from the old persistent-net
    generator to not apply to chroots. (Closes: #813141)
  * Revert "enable TasksMax= for all services by default, and set it to 512".
    Introducing a default limit on number of threads broke a lot of software
    which regularly needs more, such as MySQL and RabbitMQ, or services that
    spawn off an indefinite number of subtasks that are not in a scope, like
    LXC or cron. 512 is way too much for most "simple" services, and it's way
    too little for the ones mentioned above. Effective (and much stricter)
    limits should instead be put into units individually.
    (Closes: #823530, LP: #1578080)
  * Split out udev rule to name USB network interfaces by MAC address into
    73-usb-net-by-mac.rules, so that it's easier to disable. (Closes: #824025)
  * 73-usb-net-by-mac.rules: Disable when net.ifnames=0 is specified on the
    kernel command line, to be consistent with disabling the *.link files.
  * 73-special-net-names.rule: Name the IBM integrated management module
    virtual USB network card "ibmimm". Thanks Marco d'Itri!

 -- Martin Pitt <martin.pitt@xxxxxxxxxx>  Thu, 12 May 2016 10:30:59
+0200

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

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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1578080

Title:
  percona cluster hits resource limits in HA Openstack cloud with xenial

Status in percona-xtradb-cluster-5.6 package in Ubuntu:
  Won't Fix
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Fix Committed
Status in percona-cluster package in Juju Charms Collection:
  Won't Fix
Status in systemd package in Debian:
  Confirmed

Bug description:
  I'm trying to deploy Mitaka Openstack using the 16.04 charms on Xenial
  using Juju 1.25.5 and MAAS 1.9.2, with as many components of Openstack
  being HA as possible.

  When deployed, after running for a while mysql (which is a 3 node
  cluster) starts refusing connections, and erroring:

    2016-05-03 01:25:28 13795 [ERROR] Error log throttle:         50
  'Can't create thread to handle new connection' error(s) suppressed

  When I look at systemd-cgtop, I can see it maxing out at 512
  connections.

  To get it going again I do a:

    $ sudo systemctl edit mysql

  and set:

    TasksMax=infinity

  Sometimes I even need to edit /etc/systemd/system.conf and bump
  DefaultTasksMax to 1024 or higher, depending on long its been left
  running.

  I've noticed that dropping worker-multiplier setting on nova-cloud-
  controller, neutron-api etc all help to reduce the load, but I still
  need to bump it up.

  Please let me know if you need any more information.

  SRU INFORMATION
  ---------------
  Impact: Introducing a default #thread limit of 512 broke an unknown set of services which regularly run many threads.
  Fix: http://anonscm.debian.org/cgit/pkg-systemd/systemd.git/commit/?id=fe4d9d3ba0 (essentially, revert the upstream commit that enabled it)
  Regression potential: Very low -- this just restores the pre-228 behaviour and does not impose any new restriction.
  Test case:
   - Pick some unit like cron.service or mysql.service that does not specify an explicit TaskMax= limit.
   - Check its TaskMax: systemctl show -p TasksMax cron.service
   - In current xenial this is "512", after the update it should be a very big number (maxint minus 1, which means "infinity")

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