Freeze on Linux, repro 100%

[Guest]

Here's the data. Sorry for the wait.

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Processor Information:
    Vendor:  GenuineIntel
    CPU Family:  0x6
    CPU Model:  0x2a
    CPU Stepping:  0x7
    CPU Type:  0x0
    Speed:  3301 Mhz
    4 logical processors
    4 physical processors
    HyperThreading:  Unsupported
    FCMOV:  Supported
    SSE2:  Supported
    SSE3:  Supported
    SSSE3:  Supported
    SSE4a:  Unsupported
    SSE41:  Supported
    SSE42:  Supported
    
Network Information:
    Network Speed:  
    
Operating System Version:
    Ubuntu 14.04.3 LTS (64 bit)
    Kernel Name:  Linux
    Kernel Version:  3.13.0-65-generic
    X Server Vendor:  The X.Org Foundation
    X Server Release:  11501000
    X Window Manager:  Xfwm4
    Steam Runtime Version:  steam-runtime-release_2015-06-12
    
Video Card:
    Driver:  NVIDIA Corporation GeForce GTX 660/PCIe/SSE2

    Driver Version:  4.4.0 NVIDIA 340.93
    OpenGL Version: 4.4
    Desktop Color Depth: 24 bits per pixel
    Monitor Refresh Rate: 60 Hz
    VendorID:  0x10de
    DeviceID:  0x11c0
    Number of Monitors:  2
    Number of Logical Video Cards:  1
    Primary Display Resolution:  1920 x 1080
    Desktop Resolution: 1920 x 2280
    Primary Display Size: 18.78" x 10.55"  (21.54" diag)
                                            47.7cm x 26.8cm  (54.7cm diag)
    Primary Bus: PCI Express 16x
    Primary VRAM: 2048 MB
    Supported MSAA Modes:  2x 4x 8x 16x
    
Sound card:
    Audio device: Realtek ALC892
    
Memory:
    RAM:  16029 Mb
    
Miscellaneous:
    UI Language:  English
    LANG:  en_US.UTF-8
    Microphone:  Not set
    Total Hard Disk Space Available:  112546 Mb
    Largest Free Hard Disk Block:  7600 Mb
    
Installed software:
    
Recent Failure Reports: