It is a possible indication but not a guarantee. One thing to try would be, make a copy of your session file, and then open the copy, and start working on removing plugins there. Then when you find the problematic, make a NEW copy, and remove JUST that plugin to see if it fixes it. If it does, I would make one final archive, and modify your original session file and keep working.
It would seem you are using an ancient version of my convo.lv2, and a not optimized debug build of that as well. If you use multiple instances of that plugin, you may run into the old FFT concurrency issue.
The official binary  is not affected by this, but depending on FFTW configuration Linux distribution or custom builds might be and result in a deadlock.