Public bug reported:

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.

** Affects: calf (Ubuntu)
     Importance: Undecided
         Status: New

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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

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