See http://patchwork.freedesktop.org/patch/18053/

--- src/gallium/drivers/svga/svga_resource_texture.c
+++ src/gallium/drivers/svga/svga_resource_texture.c
@@ -205,7 +205,10 @@ svga_texture_get_handle(struct pipe_screen *screen,
    struct svga_winsys_screen *sws = svga_winsys_screen(texture->screen);
    unsigned stride;
 
-   assert(svga_texture(texture)->key.cachable == 0);
+   if (svga_texture(texture)->key.cachable) {
+      debug_warn_once("svga: texture->key.cachable=1");
+   }
+
    svga_texture(texture)->key.cachable = 0;
    stride = util_format_get_nblocksx(texture->format, texture->width0) *
             util_format_get_blocksize(texture->format);
