#0  0xb64500c2 in viaGetLock () from /usr/lib/dri/unichrome_dri.so
#1  0xb64540f6 in viaWaitIdle () from /usr/lib/dri/unichrome_dri.so
#2  0xb64506e0 in viaDestroyContext () from /usr/lib/dri/unichrome_dri.so
#3  0xb644c055 in ?? () from /usr/lib/dri/unichrome_dri.so
#4  0x0815bdb8 in ?? ()
#5  0x00000010 in ?? ()
#6  0xbfdee128 in ?? ()
#7  0x0815ac60 in ?? ()
#8  0x080f73e8 in ?? ()
#9  0x00000090 in ?? ()
#10 0xbfdee148 in ?? ()
#11 0xb7633265 in ?? () from /usr/lib/libGL.so.1
#12 0x080f73e8 in ?? ()
#13 0x00000000 in ?? ()