StacktraceTop:fbCompositeSolidMask_nx8x0565 (op=137268424, pSrc=0x18, pMask=0xbfbaa4b8, pDst=0xb7593550, xSrc=0, ySrc=0, xMask=-18562, yMask=-8204, xDst=-18481, pixman_op (newReg=0xb759340e, reg1=<value optimized out>, reg2=<value optimized out>, overlapFunc=0x10, appendNon1=-1216417504, pixman_op (newReg=0x40, reg1=<value optimized out>, reg2=<value optimized out>, overlapFunc=0, appendNon1=4, appendNon2=0, pOverlap=0x4) _cairo_surface_mask (surface=0x0, op=3216681236, source=0x0, mask=0x831c448) at /build/buildd/libcairo-1.4.2/src/cairo-surface.c:1284
StacktraceTop: fbCompositeSoli dMask_nx8x0565 (op=137268424, pSrc=0x18, pMask=0xbfbaa4b8, pDst=0xb7593550, xSrc=0, ySrc=0, xMask=-18562, yMask=-8204, xDst=-18481, -1216417504, buildd/ libcairo- 1.4.2/src/ cairo-surface. c:1284
pixman_op (newReg=0xb759340e, reg1=<value optimized out>, reg2=<value optimized out>, overlapFunc=0x10, appendNon1=
pixman_op (newReg=0x40, reg1=<value optimized out>, reg2=<value optimized out>, overlapFunc=0, appendNon1=4, appendNon2=0, pOverlap=0x4)
_cairo_surface_mask (surface=0x0, op=3216681236, source=0x0, mask=0x831c448) at /build/