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[Bernhard Trummer <1909022@xxxxxxxxxxxxxxxxxx>]

Hi.

In the meantime I was able to reproduce the very same bug in a fresh Ubuntu LTS (Desktop) installation:
- I downloaded ubuntu-20.04.1-desktop-amd64.iso and copied it to an USB stick.
- I did a standard installation on an old PC (I selected to wipe out the whole disk).
- After that, I let all updates install via network.
- Then I did an "apt-get install ardour calf-plugins" in a root shell.
  (the package versions of ardour and calf-plugins match exactly the ones described above)
- ... and from above the "Steps to reproduce 1"


> KDE Neon is not an official flavor of Ubuntu and is not supported here.

I think that's void now. :-)


Please advise if I still should raise an upstream bug report with calf...


Thanks, regards, and merry christmas.

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https://bugs.launchpad.net/bugs/1909022

Title:
  Ardour crashes when using the Calf Limiter LV2 plugin and tying to
  raise the Oversampling parameter to 4

Status in calf package in Ubuntu:
  Invalid

Bug description:
  About my system:
  It's a new KDE Slimbook with KDE neon pre-installed, which itself is based on Ubuntu focal.
  I used aptitude to install ardour, calf-plugins, and some other stuff I need to do my audio work.
  All installed packages are up-to-date, there are no pending updates.

  List of relevant installed packages:
  ii  ardour         1:5.12.0-3ubuntu4 amd64        the digital audio workstation
  ii  calf-plugins   0.90.3-1build2    amd64        Calf Studio Gear ...

  
  Steps to reproduce 1:
  - Open a new/blank Ardour workspace
  - Add the "Calf Limiter" plugin (LV2) to the Master bus
  - Double-click on the plugin to see its GUI
  - Try to raise the "Oversampling" value to 4 using the knob => crash

  
  Steps to reproduce 2:
  - Open an existing Ardour workspace where the Calf Limiter plugin is present already having an Oversampling value of 4.
  - In this case Ardour will crash right during the startup.
  - Workaround:
    - start Ardour with the '-B' option
    - activate all plugins (except the Limiter, which also would lead to an immediate crash)
    - open the Limiter and turn "Oversampling" down to 1.
    - then the Limiter plugin can be activated and everything works fine.

  
  PS:
  I noticed this bug after I was rsync'ing my audio workspaces from my PC (based on Debian/buster) to the new laptop. All workspaces and plugins (whether Calf, Guitarix, whatever) worked fine, except for my "mastering" workspace which is using the Calf Limiter plugin.

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