[Bug 1935051] Re: systemd pid 1 memory leak

[Łukasz Zemczak]

Hello Sergey, or anyone else affected,

Accepted systemd into focal-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/systemd/245.4-4ubuntu3.12 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, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. 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 for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

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

** Tags added: verification-needed verification-needed-focal

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https://bugs.launchpad.net/bugs/1935051

Title:
  systemd pid 1 memory leak

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

Bug description:
  [impact]

  pid1 leaks memory when rebuilding unit path cache

  [test case]

  see original description.

  also, the patch contains an example of how to reproduce:

  $ for i in {1..300}; do cp ~/.config/systemd/user/test0001.service
  ~/.config/systemd/user/test$(printf %04d $i).service; systemctl --user
  start test$(printf %04d $i).service;done

  [regression]

  any problems would occur when rebuilding the path cache, possibly
  resulting in memory leaks or pid1 crashes.

  [scope]

  this is needed only in f

  fixed upstream by 3fb2326f3ed87aa0b26078d307ebfb299e36286d which is
  included in v246, so fixed in h and later

  the code in b is very different and doesn't appear to have the leak,
  per original report

  [original description]

  Hi everybody.

  We've meet a memory leak of pid1 process on the focal release.
  When we launch chef-client, several systemd .service and .timers are checked for state.
  Every time of this run pid1 increase VSZ/RSS on ~ 232 Kb, this don't happen on xenial and bionic releases.
  I straced pid1 when that leak happen and found brk call.
  On pmap view of pid 1 it's anon memory grow on the same address and all marked as dirty.
  All that leak memory can be freed by calling systemctl daemon-reexec.

  Searching in systemd github repo i found this commit
  https://github.com/systemd/systemd/commit/3fb2326f3ed87aa0b26078d307ebfb299e36286d
  - it may be related to this leak.

  ------------------------------------------------------------------------

  Environment:
    Distributor ID: Ubuntu
    Description:    Ubuntu 20.04.2 LTS
    Release:        20.04
    Codename:       focal
    Uname:          5.4.0-77-generic #83-Ubuntu SMP Sat May 8 02:35:39 UTC 2021 x86_64

  Package:
    systemd:
      Installed: 245.4-4ubuntu3.7

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