.
Thread 1 (process 9077):
#0  0xb7a690c2 in viaGetLock () from /usr/lib/dri/unichrome_dri.so
#1  0xb7a6d0f6 in viaWaitIdle () from /usr/lib/dri/unichrome_dri.so
#2  0xb7a696e0 in viaDestroyContext () from /usr/lib/dri/unichrome_dri.so
#3  0xb7a65055 in ?? () from /usr/lib/dri/unichrome_dri.so
#4  0x0808e320 in ?? ()
#5  0x0000008f in ?? ()
#6  0xbfac6a98 in ?? ()
#7  0x08089d80 in ?? ()
#8  0x08075c30 in ?? ()
#9  0x0000008f in ?? ()
#10 0xbfac6ac8 in ?? ()
#11 0xb7f1d265 in ?? () from /usr/lib/libGL.so.1
#12 0x08075c30 in ?? ()
#13 0x00000000 in ?? ()