@sapista: Yes, I am Alexey Polevoy, that’s my real name.
My system is:
Debian Stretch 64 bit, always up to date
Ardour 5.5 from here
CPU is Intel Core i5-3230M
6 gigs of RAM
Also I have KXStudio repository enabled
Ardour is installed with official installer
Plugins are installed from your archive using your installer
Plugins crash on manipulating an EQ strip, randomly. I can’t be 100% sure, but it seems that hipass/lowpass filters don’t crash, so I think it happens on changing amplification coefficient. In my case, I always get it when cut out resonances or tweak wide cuts. FFT analysis isn’t involved too — crashes happen both with and without it. CPU consumption is okay, I can add about 40 instances and still have CPU load below 40%. Other plugins (not related to EQ) work like a charm.
Way to reproduce:
Add some instances to any project, start tweaking in peak mode, and after some time Ardour will crash. This can take much time to catch, sometimes I was able to almost finish a mix without problems. This happens with any usable JACK settings and with different versions, so it’s not JACK, too.