Source games doesn't start via optirun with nvidia drivers

[gudvinr]

I'm using Ubuntu 14.04 x86_64 CPU: Intel Core i3-3210M Intel GPU: HD3k Nvidia GPU: 520M

I'he installed nvidia-331-updates (331.38) drivers from official repository and installed bumblebee (3.2.1) with primus.

System information from steam Steam starting log (Before launch any game)

And when I try to start any source-based game (L4D2 or CS:GO) with launch options vblank_mode=0 optirun -b primus %command%

nothing happens and I've got only some messages in console:

Game update: AppID 550 "Left 4 Dead 2", ProcID 9399, IP 0.0.0.0:0
ERROR: ld.so: object '/home/gudvin/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
ERROR: ld.so: object '/home/gudvin/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
ERROR: ld.so: object '/home/gudvin/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
ATTENTION: default value of option vblank_mode overridden by environment.

malloc: unknown:0: assertion botched
free: called with unallocated block argument
last command: (null)
Aborting...Game removed: AppID 550 "Left 4 Dead 2", ProcID 9399

Also, there are no minidumps in /tmp/dumps

This thing happens only with source-based games as I noticed, because Killing Floor runs fine, for example. Also, those games without optirun (on intel card) runs fine.

[AnAkkk]

You haven't installed the 32bit version of primusrun.

[gudvinr]

No, I have installed primusrun for i386.

[kisak-valve]

Closing in favor of https://github.com/ValveSoftware/steam-for-linux/issues/3506, where this was investigated.