system info dota 2 reborn map load crash

Processor Information:
    Vendor:  AuthenticAMD
    CPU Family:  0x10
    CPU Model:  0xa
    CPU Stepping:  0x0
    CPU Type:  0x0
    Speed:  3258 Mhz
    6 logical processors
    6 physical processors
    HyperThreading:  Unsupported
    FCMOV:  Supported
    SSE2:  Supported
    SSE3:  Supported
    SSSE3:  Unsupported
    SSE4a:  Supported
    SSE41:  Unsupported
    SSE42:  Unsupported

Network Information:
    Network Speed:

Operating System Version:
    Ubuntu 15.04 (64 bit)
    Kernel Name:  Linux
    Kernel Version:  3.19.0-20-generic
    X Server Vendor:  The X.Org Foundation
    X Server Release:  11701000
    X Window Manager:  Compiz
    Steam Runtime Version:  steam-runtime-release_2015-01-06

Video Card:
    Driver:  NVIDIA Corporation GeForce GTX 970/PCIe/SSE2

    Driver Version:  4.5.0 NVIDIA 352.21
    OpenGL Version: 4.5
    Desktop Color Depth: 24 bits per pixel
    Monitor Refresh Rate: 59 Hz
    VendorID:  0x10de
    DeviceID:  0x13c2
    Number of Monitors:  1
    Number of Logical Video Cards:  1
    Primary Display Resolution:  1680 x 1050
    Desktop Resolution: 1680 x 1050
    Primary Display Size: 18,62" x 11,65"  (21,93" diag)
                                            47,3cm x 29,6cm  (55,7cm diag)
    Primary Bus: PCI Express 16x
    Primary VRAM: 4096 MB
    Supported MSAA Modes:  2x 4x 8x 16x

Sound card:
    Audio device: VIA VT2020

Memory:
    RAM:  7983 Mb

Miscellaneous:
    UI Language:  English
    LANG:  en_US.UTF-8
    Microphone:  Not set
    Total Hard Disk Space Available:  292263 Mb
    Largest Free Hard Disk Block:  146484 Mb

Installed software:

Recent Failure Reports:
    Wed Jun 24 12:38:34 2015 GMT: file ''/tmp/dumps/assert_20150624153245_1.dmp'', upload yes: ''CrashID=bp-03358871-c6b9-478a-851c-f1ecd2150624''