canorus crashes on exit

[matevz]

When python support is compiled in, Canorus crashes on exit with random errors like:

• double free or corruption (out)
• double free or corruption (!prev)
• free(): invalid pointer

This is always reproducible on any operating system.

[suamor]

In my experience this only happens with python plugins enabled.
Can you provide a stack trace for online discussion / analysis ?

[suamor]

My branch shows the message "corrupted size vs. prev_size" before crashing.
Stackoverflow discussion on this:
https://stackoverflow.com/questions/49628615/understanding-corrupted-size-vs-prev-size-glibc-error
This was just a quick test if anything obviously not working with my changes applied.

[matevz]

Those errors are very tricky. For me it shows a different segfault location each time it crashes. IMO it's a python-releated crash on the same object being freed twice, possibly a race condition (maybe some missing mutex lock somwhere in destructors?)..

[matevz]

This might be solved once we use smart pointers accross the code (#133).

[suamor]

PR #158 may fix this issue, please check and report back.