It’s a crash that occurs every now and then, and I think it’s possibly due to PP3 files in a directory.
pete@kanga~/rt $ ./rawtherapee
*** Error in `./rawtherapee': realloc(): invalid pointer: 0x00007fe23281ad00 ***
There’s a back trace, in the console, not sure it’s what you’d need though.
The problem often though is that a second restart clears the issue and RT starts fine.
I have tried in the past to run it under gdb but it doesn’t fail.