Comment 2 for bug 727437

StacktraceTop:
 ___tls_get_addr (ti=0xb5baefa8) at dl-tls.c:758
 lookup_composite_function (op=<value optimized out>, src=0xa1f7eb8, mask=0x0, dest=0xa1f7728, src_x=1, src_y=9, mask_x=0, mask_y=0, dest_x=0, dest_y=0, width=8, height=5) at ../../pixman/pixman.c:477
 pixman_image_composite32 (op=<value optimized out>, src=0xa1f7eb8, mask=0x0, dest=0xa1f7728, src_x=1, src_y=9, mask_x=0, mask_y=0, dest_x=0, dest_y=0, width=8, height=5) at ../../pixman/pixman.c:826
 _cairo_pattern_acquire_surface_for_gradient (pattern=0xb6730eb0, dst=0xa1f7a18, x=1, y=9, width=8, height=5, flags=0, surface_out=0xb67300fc, attributes=0xb673006c) at /build/buildd/cairo-1.10.2/src/cairo-pattern.c:1524
 _cairo_pattern_acquire_surface (pattern=0xb6730eb0, dst=0xa1f7a18, x=1, y=9, width=8, height=5, flags=0, surface_out=0xb67300fc, attributes=0xb673006c) at /build/buildd/cairo-1.10.2/src/cairo-pattern.c:2534