Comment 2 for bug 1221397

StacktraceTop:
 g_object_ref (_object=0x1eebea0) at /build/buildd/glib2.0-2.37.6/./gobject/gobject.c:3057
 g_hash_table_foreach (hash_table=0x1d3c060, func=func@entry=0x7f86f084deb0 <ref_accessible_hf>, user_data=user_data@entry=0x0) at /build/buildd/glib2.0-2.37.6/./glib/ghash.c:1526
 spi_cache_foreach (cache=<optimized out>, func=func@entry=0x7f86f084deb0 <ref_accessible_hf>, data=data@entry=0x0) at accessible-cache.c:417
 impl_GetItems (bus=<optimized out>, message=<optimized out>, user_data=<optimized out>) at cache-adaptor.c:317
 handle_other (pathstr=0x1a2c3e8 "/org/a11y/atspi/cache", member=0x1a2c438 "GetItems", iface=<optimized out>, path=0x1ec1600, message=0x1a286c0, bus=0x1e33ef0) at droute.c:553