Tracking segfaults

[Darkhog]

While fighting with chunk rendering, I've encountered problem which is segfault. Problem is that debugger points me to fpc_popaddrstack symbol, which is too vague to be of any use. How can I track it more precisely (note that I know most likely culprit, but those are three function chained from one and I need to know where it really occurs).

//edit: It seems to be worse than I thought, it seems to be multiple segfaults from different sources - after I seem to fix one, another pops up, but with same symbol.

If anyone is willing to help me debugging it, I can send compressed project folder. Dunno if I can debug it on my own.