[Bug 2029120] Re: /usr/bin/unattended-upgrade leaking and saturating RAM in 30 seconds

[Aurélien]

** Attachment added: "log-memory-monitoring-27-07.txt"
   https://bugs.launchpad.net/ubuntu/+source/unattended-upgrades/+bug/2029120/+attachment/5689538/+files/log-memory-monitoring-27-07.txt

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https://bugs.launchpad.net/bugs/2029120

Title:
  /usr/bin/unattended-upgrade leaking and saturating RAM in 30 seconds

Status in unattended-upgrades package in Ubuntu:
  New

Bug description:
  Hello,
  We are facing a huge memory leak with unattended-upgrade binary. It appears that in around 20s, 2.9Go (80%) of RAM is consumed by the process making the system unresponsive (even a basic 'ps' command remains stuck).
  The swap was voluntarily disabled, but anyway I do not expect such a process to consume up to 3Go of RAM in nominal operation.

  Note: the logs were captured on a system configured in French. I
  manually translated some words below, which could explain it is not
  exactly what you would have on an english based system.

  Ubuntu release:
  Description:    Ubuntu 22.04 LTS
  Release:        22.04

  Package version:
  unattended-upgrades:
    Installed : 2.8ubuntu1
    Candidate : 2.8ubuntu1
   Version table :
   *** 2.8ubuntu1 500
          500 http://fr.archive.ubuntu.com/ubuntu jammy/main amd64 Packages
          500 http://fr.archive.ubuntu.com/ubuntu jammy/main i386 Packages
          100 /var/lib/dpkg/status

  In attachment you will find 2 files:
  - periodic monitoring of available memory (with free -m)
  - periodic monitoring of highest memory consumer processes (with ps + sort on memory column)
  - screenshot of syslog (from a distinct run) showing that unattended-upgr went out of memory and was killed by OOM. You can also see that the run occured as part of the apt-daily service.

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