Rather 'randomly' steam crashes with SIGABRT when interacting with GUI elements (but also when it's running in background but the GUI is updated, eg. for notifications).

System Info:

Processor Information:
    Vendor:  GenuineIntel
    CPU Family:  0x6
    CPU Model:  0x3c
    CPU Stepping:  0x3
    CPU Type:  0x0
    Speed:  3800 Mhz
    8 logical processors
    4 physical processors
    HyperThreading:  Supported
    FCMOV:  Supported
    SSE2:  Supported
    SSE3:  Supported
    SSSE3:  Supported
    SSE4a:  Unsupported
    SSE41:  Supported
    SSE42:  Supported

Network Information:
    Network Speed:  

Operating System Version:
    Linux (64 bit)
    Kernel Name:  Linux
    Kernel Version:  4.3.3-2-ck
    X Server Vendor:  The X.Org Foundation
    X Server Release:  11800000
    X Window Manager:  i3
    Steam Runtime Version:  steam-runtime-release_2015-06-12

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

    Driver Version:  4.5.0 NVIDIA 358.16
    OpenGL Version: 4.5
    Desktop Color Depth: 24 bits per pixel
    Monitor Refresh Rate: 60 Hz
    VendorID:  0x10de
    DeviceID:  0x13c2
    Number of Monitors:  2
    Number of Logical Video Cards:  1
    Primary Display Resolution:  1920 x 1080
    Desktop Resolution: 3840 x 1080
    Primary Display Size: 20,91" x 11,77"  (23,98" diag)
                                            53,1cm x 29,9cm  (60,9cm diag)
    Primary Bus: PCI Express 16x
    Primary VRAM: 4096 MB
    Supported MSAA Modes:  2x 4x 8x 16x 

Sound card:
    Audio device: 

Memory:
    RAM:  15971 Mb

Miscellaneous:
    UI Language:  English
    LANG:  en_US.UTF-8
    Microphone:  Not set
    Total Hard Disk Space Available:  80505 Mb
    Largest Free Hard Disk Block:  25831 Mb

Installed software:

Recent Failure Reports:
    Fri Jan  8 16:00:25 2016 GMT: file ''/tmp/dumps/assert_20160108165940_1.dmp'', upload yes: ''CrashID=bp-58808bd0-54b2-4ca2-bae0-4f43f2160108''

One particular case with all logs I could gather:

• PID of 'main' Steam process for later reference: 6608
• minidump: assert_20160108170043_1.dmp (it's sadly empty though, there wasn't even a writing minidump in the log. Also I forgot to generate a core file)

Program received signal SIGABRT, Aborted.
0xf77d7bd0 in __kernel_vsyscall ()

Last call by a steam program (complete backtrace here: https://gist.github.com/LeonardKoenig/c64f7dca6dc3047e73b7#file-bt):

[#18](/issue/ValveSoftware/steam-for-linux/18) 0xf6b57749 in glXMakeCurrent () from /usr/lib32/libGL.so.1
[#19](/issue/ValveSoftware/steam-for-linux/19) 0xef9edd9c in ?? () from /home/leonard/.local/share/Steam/ubuntu12_32/vgui2_s.so

The address where everything went wrong:

[#19](/issue/ValveSoftware/steam-for-linux/19) 0xef9edd9c in ?? () from /home/leonard/.local/share/Steam/ubuntu12_32/vgui2_s.so

0xef9a8580 - 0xefa5087c is .text in /home/leonard/.local/share/Steam/ubuntu12_32/vgui2_s.so

Symbols from "/home/leonard/.local/share/Steam/ubuntu12_32/vgui2_s.so".
        0x00016580 - 0x000be87c is .text

So we have an offset of 0x4581C which gives us a base address of 0x5BD9C in the vgui2_s.so, which corresponds to this snippet:

   0x5bd94:     mov    %eax,(%esp)
   0x5bd97:     call   0x152e0 <glXMakeCurrent@plt>
   0x5bd9c:     lea    0xb0(%esp),%eax

All logs etc:
https://gist.github.com/LeonardKoenig/c64f7dca6dc3047e73b7

Some other dumps / corresponding core files (created with breakpad minidump-2-core) I've found which seem to be related:
https://drive.google.com/file/d/0B2gXBp6AAG7fbkhEV3oxRkRRSTA/view?usp=sharing