backtrace from GDB Program received signal SIGSEGV, Segmentation fault. 0x0080b802 in ?? () from /usr/lib/i386-linux-gnu/dri/swrast_dri.so (gdb) bt #0 0x0080b802 in ?? () from /usr/lib/i386-linux-gnu/dri/swrast_dri.so #1 0x0096f86f in _swrast_Clear () from /usr/lib/i386-linux-gnu/dri/libdricore.so #...