Found the issue. A seemingly innocent looking model of a Denon LP player downloaded as Collada file:

https://3dwarehouse.sketchup.com/model/146e084b-442e-41b3-a405-419684c216a3/Denon-SL-7D-Turntable

Works almost OK with SunFlow, crashes YafaRay instantly. When I change "edge_color*" invisible ...

A minimal project renders fine, and even some close-ups in the failing model. I'll try to isolate the feature, then either create a sample or share the actual model.

On Win10 my project has started to consistently crash Yafaray as well on memory access violation. The fault offset is constant.

Faulting application name: javaw.exe, version: 11.45.0.27, time stamp: 0x5fece988
Faulting module name: libyafaray_v3_core.dll, version: 0.0.0.0, time stamp: 0x60467f34 ...