Comment 2 for bug 927209

StacktraceTop:
 __GI___assert_fail (assertion=0xb6bfed39 "ret != inval_id", file=0xb6bfecaa "../../src/xcb_io.c", line=528, function=0xb6bfedbe "_XAllocID") at assert.c:81
 _XAllocID (dpy=0xb7873940) at ../../src/xcb_io.c:528
 XCreatePixmap (dpy=0xb7873940, d=75501453, width=22, height=22, depth=32) at ../../src/CrPixmap.c:56
 _cairo_xlib_surface_create_similar (abstract_src=0xade13c00, content=CAIRO_CONTENT_COLOR_ALPHA, width=22, height=22) at /build/buildd/cairo-1.10.2/src/cairo-xlib-surface.c:393
 _cairo_surface_create_similar_scratch (other=0xade13c00, content=CAIRO_CONTENT_COLOR_ALPHA, width=22, height=22) at /build/buildd/cairo-1.10.2/src/cairo-surface.c:461