[Bug 1935051] Re: systemd pid 1 memory leak

[Sergey Borodavkin]

** Attachment added: "pmap_pid1_focal"
   https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1935051/+attachment/5509911/+files/pmap_pid1_focal

** Description changed:

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

** Tags added: pid1

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

Title:
  systemd pid 1 memory leak

Status in systemd package in Ubuntu:
  New

Bug 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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