[Bug 1837580] Re: memlock is not set

[Mauro Panigada]

The same happens to me, same distro, some infos are different (namely
the kernel, 4.18.0-18-generic, since 5.0.0... frozes my machine -
another issue to be investigated), but I don't think these differences
are relevant. I've set

DefaultLimitMEMLOCK=infinity

in /etc/systemd/system.conf and also /etc/systemd/user.conf (also tried
to put a file in newly created /etc/systemd/user.conf.d)

/etc/security/limits.d/audio.conf has

@audio   -  rtprio     95
@audio   -  memlock    unlimited


As root I can ulimit -l to unlimited. As normal user (in the group audio of course) I can't go with more than 65536.

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https://bugs.launchpad.net/bugs/1837580

Title:
  memlock is not set

Status in systemd package in Ubuntu:
  New
Status in systemd package in Debian:
  Unknown

Bug description:
  I discovered this in relation to jack, which installs
  /etc/security/limits.d/audio.conf, containing:

  @audio   -  rtprio     95
  @audio   -  memlock    unlimited

  For a user in the audio group:

  $ulimit -l -r
  max locked memory       (kbytes, -l) 65536
  real-time priority              (-r) 95

  So jack (run as user via qjackctl) reports:

  ERROR: Cannot lock down 82280346 byte memory area (Cannot allocate
  memory)

  but does not report that it cannot set real-time priority, which it
  does if run by a user not in the audio group.

  I also tried putting the line in /etc/security/limits.conf, and trying
  a number rather than "unlimited", but it didn't help.

  Also reported independently here:
  https://askubuntu.com/questions/1142943/ulimit-unlimited-cannot-set

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: libpam-modules:amd64 1.3.1-5ubuntu1
  ProcVersionSignature: Ubuntu 5.0.0-20.21-lowlatency 5.0.8
  Uname: Linux 5.0.0-20-lowlatency x86_64
  ApportVersion: 2.20.10-0ubuntu27.1
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Jul 23 15:07:52 2019
  InstallationDate: Installed on 2016-10-25 (1000 days ago)
  InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
  SourcePackage: pam
  UpgradeStatus: Upgraded to disco on 2019-07-19 (3 days ago)

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