[ 10185.387] (EE) 
[ 10185.387] (EE) Backtrace:
[ 10185.387] (EE) 0: /usr/bin/X (xorg_backtrace+0x56) [0x7f30b464b3c6]
[ 10185.387] (EE) 1: /usr/bin/X (0x7f30b4497000+0x1b85b9) [0x7f30b464f5b9]
[ 10185.387] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7f30b1f44000+0x35180) [0x7f30b1f79180]
[ 10185.388] (EE) 3: /usr/lib/x86_64-linux-gnu/libLLVM-3.7svn.so (_ZNK4llvm18TargetRegisterInfo24getMatchingSuperRegClassEPKNS_19TargetRegisterClassES3_j+0x14) [0x7f30ac8d0074]
[ 10185.388] (EE) 4: /usr/lib/x86_64-linux-gnu/libLLVM-3.7svn.so (0x7f30aba7f000+0xdf7354) [0x7f30ac876354]
[ 10185.388] (EE) 5: /usr/lib/x86_64-linux-gnu/libLLVM-3.7svn.so (0x7f30aba7f000+0xdf801b) [0x7f30ac87701b]
[ 10185.388] (EE) 6: /usr/lib/x86_64-linux-gnu/libLLVM-3.7svn.so (0x7f30aba7f000+0xdfa2ad) [0x7f30ac8792ad]
[ 10185.389] (EE) 7: /usr/lib/x86_64-linux-gnu/libLLVM-3.7svn.so (_ZN4llvm13FPPassManager13runOnFunctionERNS_8FunctionE+0x1d7) [0x7f30ac3fbca7]
[ 10185.389] (EE) 8: /usr/lib/x86_64-linux-gnu/libLLVM-3.7svn.so (_ZN4llvm13FPPassManager11runOnModuleERNS_6ModuleE+0x2b) [0x7f30ac3fbd2b]
[ 10185.389] (EE) 9: /usr/lib/x86_64-linux-gnu/libLLVM-3.7svn.so (_ZN4llvm6legacy15PassManagerImpl3runERNS_6ModuleE+0x2b9) [0x7f30ac3fe059]
[ 10185.390] (EE) 10: /usr/lib/x86_64-linux-gnu/libLLVM-3.7svn.so (0x7f30aba7f000+0xf4c70e) [0x7f30ac9cb70e]
[ 10185.390] (EE) 11: /usr/lib/x86_64-linux-gnu/libLLVM-3.7svn.so (LLVMTargetMachineEmitToMemoryBuffer+0x157) [0x7f30ac9cb8c7]
[ 10185.390] (EE) 12: /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so (0x7f30ad6c9000+0x58ca42) [0x7f30adc55a42]
[ 10185.390] (EE) 13: /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so (0x7f30ad6c9000+0x4f3284) [0x7f30adbbc284]
[ 10185.390] (EE) 14: /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so (0x7f30ad6c9000+0x4f3f52) [0x7f30adbbcf52]
[ 10185.390] (EE) 15: /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so (0x7f30ad6c9000+0x4ff10c) [0x7f30adbc810c]
[ 10185.390] (EE) 16: /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so (0x7f30ad6c9000+0x500439) [0x7f30adbc9439]
[ 10185.390] (EE) 17: /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so (0x7f30ad6c9000+0x4fd835) [0x7f30adbc6835]
[ 10185.390] (EE) 18: /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so (0x7f30ad6c9000+0x43bd36) [0x7f30adb04d36]
[ 10185.390] (EE) 19: /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so (0x7f30ad6c9000+0x3a86a2) [0x7f30ada716a2]
[ 10185.390] (EE) 20: /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so (0x7f30ad6c9000+0x25fa6c) [0x7f30ad928a6c]
[ 10185.390] (EE) 21: /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so (0x7f30ad6c9000+0x21ab47) [0x7f30ad8e3b47]
[ 10185.390] (EE) 22: /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so (0x7f30ad6c9000+0x21ad5b) [0x7f30ad8e3d5b]
[ 10185.390] (EE) 23: /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so (0x7f30ad6c9000+0x21ae17) [0x7f30ad8e3e17]
[ 10185.390] (EE) 24: /usr/lib/x86_64-linux-gnu/libGL.so.1 (glDrawRangeElements+0x4e) [0x7f30b050196a]
[ 10185.390] (EE) 25: /usr/lib/xorg/modules/libglamoregl.so (0x7f30ae56b000+0x179be) [0x7f30ae5829be]
[ 10185.390] (EE) 26: /usr/lib/xorg/modules/libglamoregl.so (0x7f30ae56b000+0x19deb) [0x7f30ae584deb]
[ 10185.390] (EE) 27: /usr/lib/xorg/modules/libglamoregl.so (0x7f30ae56b000+0xe372) [0x7f30ae579372]
[ 10185.390] (EE) 28: /usr/lib/xorg/modules/libglamoregl.so (0x7f30ae56b000+0x10b06) [0x7f30ae57bb06]
[ 10185.390] (EE) 29: /usr/lib/xorg/modules/libglamoregl.so (0x7f30ae56b000+0x11214) [0x7f30ae57c214]
[ 10185.391] (EE) 30: /usr/bin/X (0x7f30b4497000+0x13d293) [0x7f30b45d4293]
[ 10185.391] (EE) 31: /usr/bin/X (0x7f30b4497000+0x1332a7) [0x7f30b45ca2a7]
[ 10185.391] (EE) 32: /usr/bin/X (0x7f30b4497000+0x58317) [0x7f30b44ef317]
[ 10185.391] (EE) 33: /usr/bin/X (0x7f30b4497000+0x5c4ab) [0x7f30b44f34ab]
[ 10185.391] (EE) 34: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) [0x7f30b1f65b45]
[ 10185.391] (EE) 35: /usr/bin/X (0x7f30b4497000+0x4689e) [0x7f30b44dd89e]
[ 10185.391] (EE) 
[ 10185.391] (EE) Segmentation fault at address 0x18
[ 10185.391] (EE) 
Fatal server error:
[ 10185.391] (EE) Caught signal 11 (Segmentation fault). Server aborting
[ 10185.391] (EE) 
[ 10185.391] (EE) 
Please consult the The X.Org Foundation support 
	 at http://wiki.x.org
 for help. 
[ 10185.391] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[ 10185.391] (EE) 
[ 10185.391] (II) AIGLX: Suspending AIGLX clients for VT switch
[ 10185.401] (EE) Server terminated with error (1). Closing log file.