Crash after starting and picking up a few items

[megadonkey]

I'm experiencing segfaults right after I start a new game (or continue one after a crash). It seems to happen on clicking to interact with an item; sometimes before that I can click maybe one or two that are fine.
I've verified the install several times, tried the non-steam binary, a public beta, fiddled around with removing and putting back libs, even reinstalled Steam, but it still crashes every time.
I have no trouble running other 3D games on this system (Debian Testing on a laptop with a GTX 660M, proprietary NVidia driver 352.79-1), such as The Talos Principle and Metro: Last Light.
Anyway I've been trying to get this game to work since last night, it's 6am and I'm close to tears. What now?
Attached ~/.local/share/frictionalgames/Soma/Main/hpl.log