[Bug 1966381] Re: applications crash that never crashed under Ubuntu-20.04

[Dan Streetman]

wow, looking at the systemd code (even upstream), oomd is counting
pagecache as 'used' memory which is massively unfair as the kernel is
responsible for pagecache use, not userspace, and it's not even accurate
(from a OOM perspective) since the kernel will drop pagecache as memory
pressure increases.

Definitely some discussion and patching needs to happen upstream in
systemd I think.

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Title:
  applications crash that never crashed under Ubuntu-20.04

Status in systemd package in Ubuntu:
  New
Status in systemd source package in Jammy:
  New

Bug description:
  Just now I was watching some video in Firefox. I popped over to
  another virtual workspace for a few minutes, and when I popped back to
  Firefox it had gone. The same thing had been happening all week (I
  installed fresh Ubuntu-22.04 last week) with Chrome, Firefox and
  Thunderbird.

  This time instead of shrugging it off I looked in the logs, and found
  this

  Mar 25 19:45:40 ubuntu systemd-oomd[960]: Killed /user.slice/user-1001.slice/user at 1001.service/app.slice/app-gnome-firefox-6607.scope due to memory used (15940579328) / total (16153944064) and swap used (925564928) / total (1023406080) being more than 90.00%
  Mar 22 08:11:29 ubuntu systemd[5029]: app-gnome-google\x2dchrome-5412.scope: systemd-oomd killed 298 process(es) in this unit.
  Mar 23 11:09:28 ubuntu systemd-oomd[1055]: Killed /user.slice/user-1001.slice/user at 1001.service/app.slice/app-gnome-thunderbird-5418.scope due to memory used (15591993344) / total (16149745664) and swap used (927760384) / total (1023406080) being more than 90.00%
  Mar 23 11:09:28 ubuntu systemd[5029]: app-gnome-thunderbird-5418.scope: systemd-oomd killed 173 process(es) in this unit.

  I know it's saying those three entirely unrelated applications had
  suddenly decided to swallow all the RAM+swap on this laptop of mine -
  but the very same apps didn't act like that last week under
  Ubuntu-20.04, so I suspect something else is going on

  I can't say they hadn't swallowed all the RAM, but there is ZERO sign
  of a system on the verge of collapsing - everything has been screaming
  along just nicely - no sign of the "staggering" you normally get when
  the OS is heavily into swap.

  However, now that I look I see my 16G laptop only has 1G swap??? I
  just let the Ubuntu installer do it's defaults - but it used to auto-
  choose 1xRAM or 2xRAM - what's with this 1G swap? Could that be
  related?

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: systemd-oomd 249.11-0ubuntu1
  ProcVersionSignature: Ubuntu 5.15.0-23.23-generic 5.15.27
  Uname: Linux 5.15.0-23-generic x86_64
  ApportVersion: 2.20.11-0ubuntu79
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Mar 25 19:47:44 2022
  InstallationDate: Installed on 2022-03-13 (11 days ago)
  InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Alpha amd64 (20220313)
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)

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