Conditional jump or move depends on uninitialised value(s) at rsvg_c_api::pixbuf_utils::pixbuf_from_surface (pixbuf_utils.rs:49)
With librsvg2-2.46.4-1.fc31 and gtk3-3.24.13-1.fc31, I see this warning when starting Epiphany under valgrind:
==44464== Conditional jump or move depends on uninitialised value(s)
==44464== at 0x41ED9DF3: rsvg_c_api::pixbuf_utils::pixbuf_from_surface (pixbuf_utils.rs:49)
==44464== by 0x41DEAAF5: get_pixbuf_sub (c_api.rs:635)
==44464== by 0x41DEAAF5: rsvg_rust_handle_get_pixbuf_sub (c_api.rs:1004)
==44464== by 0x41D77495: gdk_pixbuf__svg_image_stop_load (io-svg.c:166)
==44464== by 0x41D77495: gdk_pixbuf__svg_image_stop_load (io-svg.c:146)
==44464== by 0x5C03232: gdk_pixbuf_loader_close (gdk-pixbuf-loader.c:846)
==44464== by 0x5BFFAC2: load_from_stream (gdk-pixbuf-io.c:1508)
==44464== by 0x5C009EE: gdk_pixbuf_new_from_stream_at_scale (gdk-pixbuf-io.c:1577)
==44464== by 0x4BD77D1: icon_info_ensure_scale_and_pixbuf (gtkicontheme.c:3963)
==44464== by 0x4BD77D1: icon_info_ensure_scale_and_pixbuf (gtkicontheme.c:3853)
==44464== by 0x4BDAB67: gtk_icon_info_load_icon (gtkicontheme.c:4088)
==44464== by 0x4BDADD3: gtk_icon_theme_load_icon_for_scale (gtkicontheme.c:2361)
==44464== by 0x4D67BB9: icon_list_from_theme (gtkwindow.c:4483)
==44464== by 0x4D692A0: gtk_window_realize_icon (gtkwindow.c:4531)
==44464== by 0x4D7065E: gtk_window_realize (gtkwindow.c:7603)