[Linux] Sometimes get black screen (segfault) after alt-tabbing whilst ingame

ceribik

Ever since the latest patch (or the one before it), after alt-tabbing the game occasionally will turn into a black screen and become non-responsive. If I repetively try to alt-tab back, I can sometimes still hear sound from the game, but the only way to fix the graphics is to terminate the game forceably.

Here's a backtrace:

Program received signal SIGSEGV, Segmentation fault.
0xf10ac266 in ?? () from /usr/lib32/libnvidia-glcore.so.343.22
(gdb) bt
#0  0xf10ac266 in ?? () from /usr/lib32/libnvidia-glcore.so.343.22
#1  0xf106fc47 in ?? () from /usr/lib32/libnvidia-glcore.so.343.22
#2  0xf0cd9469 in ?? () from /usr/lib32/libnvidia-glcore.so.343.22
#3  0xf0cd9ce7 in ?? () from /usr/lib32/libnvidia-glcore.so.343.22
#4  0xf0cda0fd in ?? () from /usr/lib32/libnvidia-glcore.so.343.22
#5  0xf71cf0af in M4::OpenGLDevice::CopyTexture (this=0xe61cf040, _srcTexture=0xb53d6af8, _dstTexture=0xb5ce97e0)
    at ../Source/Render/OpenGLDevice.cpp:1113
#6  0xf72011d2 in M4::RenderPipeline::ExecuteCopy (this=0xb55f3838, layer=...) at ../Source/Render/RenderPipeline.cpp:1196
#7  0xf720131c in M4::RenderPipeline::ExecuteLayer (this=0xb55f3838, layer=...) at ../Source/Render/RenderPipeline.cpp:1172
#8  0xf7212ebb in M4::RenderRenderer::Render (this=0xd7cbecd8, pipeline=0xb55f3838, colorTarget=0xb3a5c2b0, depthTarget=0xa934e090, faceIndex=0, 
    sourceTexture=0x0, sceneSettings=0xd8450e7a, setupSettings=0xffe6ca38, scene=0xd58592f8, time=3479.44921875, camera=..., viewport=..., 
    visibleObjects=..., background=0x0) at ../Source/Render/RenderRenderer.cpp:1148
#9  0xf7227799 in M4::RenderScene::InternalRender (this=0xd58592f8, settings=..., colorTarget=0xb3a5c2b0, depthTarget=0xa934e090, faceIndex=0, 
    pipeline=0xb55f3838, camera=..., prevCamera=0x0, viewport=..., renderMask=4294967295, cullingMode=M4::RenderScene_CullingMode_Occlusion, 
    background=0x0, deltaTime=0.033203125) at ../Source/Render/RenderScene.cpp:787
#10 0xf7228361 in M4::RenderScene::InternalRender (this=0xd58592f8, settings=..., colorTarget=0xb3a5c2b0, depthTarget=0xa934e090, faceIndex=0, 
    camera=0xb775a3b8, _viewport=0x0, background=0x0, deltaTime=0.033203125) at ../Source/Render/RenderScene.cpp:729
#11 0xf7228644 in M4::RenderScene::RenderMainCamera (this=0xd58592f8, settings=..., colorTarget=0xb3a5c2b0, depthTarget=0xa934e090, faceIndex=0, 
    camera=0xb775a3b8, viewport=0x0, background=0x0, time=3479.44921875) at ../Source/Render/RenderScene.cpp:690
#12 0xf722870e in M4::RenderScene::Render (this=0xd58592f8, settings=..., colorTarget=0xb3a5c2b0, depthTarget=0xa934e090, camera=0xb775a3b8, 
    background=0x0, time=3479.44921875) at ../Source/Render/RenderScene.cpp:490

Specs:

Processor Information:
    Vendor:  GenuineIntel
    CPU Family:  0x6
    CPU Model:  0x2a
    CPU Stepping:  0x7
    CPU Type:  0x0
    Speed:  6300 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:
    "Arch Linux" (64 bit)
    Kernel Name:  Linux
    Kernel Version:  3.16.3-1-ARCH
    X Server Vendor:  The X.Org Foundation
    X Server Release:  11601000
    X Window Manager:  KWin
    Steam Runtime Version:  steam-runtime-release_2014-08-20
    
Video Card:
    Driver:  NVIDIA Corporation GeForce GTX 560 Ti/PCIe/SSE2

    Driver Version:  4.4.0 NVIDIA 343.22
    OpenGL Version: 4.4
    Desktop Color Depth: 24 bits per pixel
    Monitor Refresh Rate: 59 Hz
    VendorID:  0x10de
    DeviceID:  0x1200
    Number of Monitors:  1
    Number of Logical Video Cards:  1
    Primary Display Resolution:  1680 x 1050
    Desktop Resolution: 1680 x 1050
    Primary Display Size: 18.66" x 11.65"  (21.97" diag)
                                            47.4cm x 29.6cm  (55.8cm diag)
    Primary Bus: PCI Express 16x
    Primary VRAM: 1024 MB
    Supported MSAA Modes:  2x 4x 8x 16x 
    
Sound card:
    Audio device: USB Mixer
    
Memory:
    RAM:  15998 Mb