#0  0xb79c10d2 in viaGetLock () from /usr/lib/dri/unichrome_dri.so
#1  0xb79c51a6 in viaWaitIdle () from /usr/lib/dri/unichrome_dri.so
#2  0xb79c16f0 in viaDestroyContext () from /usr/lib/dri/unichrome_dri.so
#3  0xb79bd055 in ?? () from /usr/lib/dri/unichrome_dri.so
#4  0x0808b218 in ?? ()
#5  0x00000090 in ?? ()
#6  0xbf82cf88 in ?? ()
#7  0x0808b920 in ?? ()
#8  0x08075c30 in ?? ()
#9  0x00000090 in ?? ()
#10 0xbf82cfb8 in ?? ()
#11 0xb7e89255 in ?? () from /usr/lib/libGL.so.1
#12 0x08075c30 in ?? ()
#13 0x00000000 in ?? ()