I have Ardour project using Guitarix LV2 plugin (the project is in attachment). When I try to open the project Ardour crashes. Acording backtrace from core dump the crash is caused by Guitarix plug-in. The backtrace (bt.log) and Ardour output (ardour-crash.log) is also in attachment. I didn't attach core dump because its size is about 400MB. I can send it later if needed.
Ardour version is 3.5.357, Guitarix version is guitarix2 0.28.3. Linux distro is Arch Linux.
I was looking at guitarix source code to find the cause of the crash. It seems to crash in Convlevel::configure(...) method in trunk/src/zita-convolver-ffmpeg/zita-convolver.cc after _freq_data is allocated. Variable _freq_data is allocated using av_malloc() in Convlevel::alloc_aligned() method. I thing _freq_data should be freed using av_free() instead of just free() in Convlevel::cleanup(). This change in code seems to fix the problem.