Steam crashes X server, Linux 3.15

steam-crash

slim[285]: (EE) Server terminated with error (1). Closing log file.
slim[285]: (II) AIGLX: Suspending AIGLX clients for VT switch
slim[285]: (EE)
(EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
slim[285]: for help.
slim[285]: at http://wiki.x.org
slim[285]: Please consult the The X.Org Foundation support
slim[285]: (EE)
slim[285]: (EE)
slim[285]: (EE) Caught signal 11 (Segmentation fault). Server aborting
slim[285]: Fatal server error:
slim[285]: (EE)
slim[285]: (EE) Segmentation fault at address 0x10
slim[285]: (EE)
slim[285]: (EE) 18: /usr/bin/X (0x400000+0x2507e) [0x42507e]
slim[285]: (EE) 17: /usr/lib/libc.so.6 (__libc_start_main+0xf0) [0x7f85830d1000]
slim[285]: (EE) 16: /usr/bin/X (0x400000+0x39aaa) [0x439aaa]
slim[285]: (EE) 15: /usr/bin/X (0x400000+0x35c8e) [0x435c8e]
slim[285]: (EE) 14: /usr/bin/X (0x400000+0x31be7) [0x431be7]
slim[285]: (EE) 13: /usr/lib/xorg/modules/drivers/radeon_drv.so (0x7f857dbdd000+0x4bce3) [0x7f857dc28ce3]
slim[285]: (EE) 12: /usr/lib/libglamor.so.0 (glamor_create_pixmap+0x298) [0x7f8580d157b8]
slim[285]: (EE) 11: /usr/lib/libglamor.so.0 (0x7f8580d11000+0x27386) [0x7f8580d38386]
slim[285]: (EE) 10: /usr/lib/libglamor.so.0 (0x7f8580d11000+0x26bdc) [0x7f8580d37bdc]
slim[285]: (EE) 9: /usr/lib/xorg/modules/libglamoregl.so (glamor_egl_create_argb8888_based_texture+0x83) [0x7f858137ccf3]
slim[285]: (EE) 8: /usr/lib/xorg/modules/libglamoregl.so (0x7f858137b000+0x1a08) [0x7f858137ca08]
slim[285]: (EE) 7: /usr/lib/xorg/modules/dri/radeonsi_dri.so (0x7f857d15e000+0x13cee3) [0x7f857d29aee3]
slim[285]: (EE) 6: /usr/lib/xorg/modules/dri/radeonsi_dri.so (0x7f857d15e000+0x19ed66) [0x7f857d2fcd66]
slim[285]: (EE) 5: /usr/lib/xorg/modules/dri/radeonsi_dri.so (0x7f857d15e000+0x1c0b0d) [0x7f857d31eb0d]
slim[285]: (EE) 4: /usr/lib/xorg/modules/dri/radeonsi_dri.so (0x7f857d15e000+0x65fe2) [0x7f857d1c3fe2]
slim[285]: (EE) 3: /usr/lib/xorg/modules/dri/radeonsi_dri.so (0x7f857d15e000+0x67248) [0x7f857d1c5248]
slim[285]: (EE) 2: /usr/lib/libpthread.so.0 (0x7f8584464000+0xf4b0) [0x7f85844734b0]
slim[285]: (EE) 1: /usr/bin/X (0x400000+0x1887f9) [0x5887f9]
slim[285]: (EE) 0: /usr/bin/X (xorg_backtrace+0x48) [0x584b08]
slim[285]: (EE) Backtrace:
slim[285]: (EE)
slim[285]: Installing breakpad exception handler for appid(steam)/version(1.0_client)
slim[285]: Installing breakpad exception handler for appid(steam)/version(1.0_client)
slim[285]: libGL error: failed to load driver: swrast
slim[285]: libGL error: unable to load driver: swrast_dri.so
slim[285]: libGL error: dlopen /usr/lib32/xorg/modules/dri/swrast_dri.so failed (/home/nuc/.local/share/Steam/ubuntu12_32/steam-runtime/i386/lib/i386-linux-gnu/libgcc_s.so.1: version `GCC_4.7.0' not found (required by /usr/lib32/xorg/modules/dri/swrast_dri.so))
slim[285]: libGL error: failed to load driver: radeonsi
slim[285]: libGL error: driver pointer missing
slim[285]: libGL error: unable to load driver: radeonsi_dri.so
slim[285]: libGL error: dlopen /usr/lib32/xorg/modules/dri/radeonsi_dri.so failed (/home/nuc/.local/share/Steam/ubuntu12_32/steam-runtime/i386/lib/i386-linux-gnu/libgcc_s.so.1: version `GCC_4.7.0' not found (required by /usr/lib32/xorg/modules/dri/radeonsi_dri.so))
slim[285]: Installing breakpad exception handler for appid(steam)/version(0_client)
slim[285]: STEAM_RUNTIME is enabled automatically
slim[285]: Running Steam on arch rolling 64-bit
slim[285]: Repairing installation, linking /home/nuc/.steam/steam to /home/nuc/.local/share/Steam