http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60731
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jason at gcc dot gnu.org
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
We hit
void
_dl_close (void *_map)
{
struct link_map *map = _map;
/* First see whether we can remove the object at all. */
if (__builtin_expect (map->l_flags_1 & DF_1_NODELETE, 0))
{
assert (map->l_init_called);
/* Nope. Do nothing. */
return;
the DF_1_NODELETE flag is set already after the first dlopen call which sets
it via do_lookup_x for the STB_GNU_UNIQUE symbol _ZGVZ16make_static_stayvE3smp
if (map->l_type == lt_loaded)
/* Make sure we don't unload this object by
setting the appropriate flag. */
((struct link_map *) map)->l_flags_1 |= DF_1_NODELETE;
so this either points to a "bad" design on the guard code for initializing
'smp' or to a weakness in the dynamic loader which doesn't handle unloading
of objects which define any(?) STB_GNU_UNIQUE symbol. Note the above is
guarded with
if ((type_class & ELF_RTYPE_CLASS_COPY) != 0)
enter (entries, size, new_hash, strtab + sym->st_name, ref,
undef_map);
else
{
enter (entries, size, new_hash, strtab + sym->st_name, sym,
map);
if (map->l_type == lt_loaded)
/* Make sure we don't unload this object by
setting the appropriate flag. */
((struct link_map *) map)->l_flags_1 |= DF_1_NODELETE;
}
thus if this were referenced via a copy relocation it would work.
Jason?
