Program received signal SIGSEGV, Segmentation fault.
0x63696d65 in ?? ()
(gdb) bt f
#0  0x63696d65 in ?? ()
No symbol table info available.
#1  0xb7a8e1d7 in drm_intel_bo_unreference (bo=0xb83be50) at ../../../libdrm/intel/intel_bufmgr.c:73
No locals.
#2  0xb7a24a6e in i965_prepare_composite (op=3, pSrcPicture=0xb3dbf90, pMaskPicture=0x0, pDstPicture=0xd1404a0, pSrc=0xe4ec3f8, pMask=0x0, pDst=0xdf85038)
    at ../../src/i965_render.c:1350
        pScrn = (struct _ScrnInfoRec *) 0x89dbc20
        pI830 = (struct _I830Rec *) 0x89dc2f0
        render_state = (struct gen4_render_state *) 0x89ed068
        binding_table = (uint32_t *) 0xb7a6b000
        binding_table_bo = (drm_intel_bo *) 0xd140c00
        surface_state_bo = (drm_intel_bo *) 0xb2d69d8
#3  0xb7a8088f in exaTryDriverComposite () from /usr/lib/xorg/modules//libexa.so
No locals.
#4  0x0e4ec3f8 in ?? ()
No symbol table info available.
#5  0x00000000 in ?? ()
No symbol table info available.