I did my masters thesis with GNURadio 2013-2016 (a frequency-hopping implementation). I often thought my struggles were 100% my own incompetence, but eventually realized it was possibly 50% buggy GNURadio blocks. So much potential in SDRs but damn was this software an opaque mess to use.
There was a time where I could point to specific implementations in GNURadios source that were very buggy (lots of uninitialized memory assumed to be zeroed), but alas, it's been lost from my memory.
