Date: Wed, 3 Nov 2010 20:30:14 GMT From: Kostik Belousov <kostikbel@gmail.com> To: freebsd-bugs@FreeBSD.org Subject: Re: misc/151861: dlclose() of library causes separately opened libraries to unload as well Message-ID: <201011032030.oA3KUEK5055658@freefall.freebsd.org>
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The following reply was made to PR misc/151861; it has been noted by GNATS.
From: Kostik Belousov <kostikbel@gmail.com>
To: Jaakko Heinonen <jh@freebsd.org>
Cc: Alexander Kabaev <kabaev@gmail.com>,
Arjan van Leeuwen <freebsd-maintainer@opera.com>,
bug-followup@freebsd.org, kan@freebsd.org
Subject: Re: misc/151861: dlclose() of library causes separately opened libraries to unload as well
Date: Wed, 3 Nov 2010 22:27:50 +0200
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On Wed, Nov 03, 2010 at 08:48:24PM +0200, Jaakko Heinonen wrote:
> On 2010-11-03, Kostik Belousov wrote:
> > By intermediate I mean private intermediate state in my working tree.
> > Below is the patch augmented with the change to not call ref_dag()
> > from init_dag().
>=20
> I prefer this one. Could you also add assert(root->dag_inited); to
> ref_dag() and unref_dag()?
This is reasonable but IMHO risky asserts.
I added them as requested, will see how it going.
Any further suggestions or objections ? If not, I will commit this tomorrow
morning.
diff --git a/libexec/rtld-elf/rtld.c b/libexec/rtld-elf/rtld.c
index f1ffc3e..bf21586 100644
--- a/libexec/rtld-elf/rtld.c
+++ b/libexec/rtld-elf/rtld.c
@@ -1276,7 +1276,7 @@ init_dag(Obj_Entry *root)
DoneList donelist;
=20
if (root->dag_inited)
- return;
+ return;
donelist_init(&donelist);
init_dag1(root, root, &donelist);
root->dag_inited =3D true;
@@ -1290,7 +1290,6 @@ init_dag1(Obj_Entry *root, Obj_Entry *obj, DoneList *=
dlp)
if (donelist_check(dlp, obj))
return;
=20
- obj->refcount++;
objlist_push_tail(&obj->dldags, root);
objlist_push_tail(&root->dagmembers, obj);
for (needed =3D obj->needed; needed !=3D NULL; needed =3D needed->ne=
xt)
@@ -2031,6 +2030,7 @@ dlopen(const char *name, int mode)
assert(*old_obj_tail =3D=3D obj);
result =3D load_needed_objects(obj, RTLD_LO_DLOPEN);
init_dag(obj);
+ ref_dag(obj);
if (result !=3D -1)
result =3D rtld_verify_versions(&obj->dagmembers);
if (result !=3D -1 && ld_tracing)
@@ -2054,10 +2054,8 @@ dlopen(const char *name, int mode)
* already loaded as a dependency, initialize the dag
* starting at it.
*/
- if (obj->dl_refcount =3D=3D 1)
- init_dag(obj);
- else
- ref_dag(obj);
+ init_dag(obj);
+ ref_dag(obj);
=20
if (ld_tracing)
goto trace;
@@ -3085,6 +3083,7 @@ ref_dag(Obj_Entry *root)
{
Objlist_Entry *elm;
=20
+ assert(root->dag_inited);
STAILQ_FOREACH(elm, &root->dagmembers, link)
elm->obj->refcount++;
}
@@ -3094,6 +3093,7 @@ unref_dag(Obj_Entry *root)
{
Objlist_Entry *elm;
=20
+ assert(root->dag_inited);
STAILQ_FOREACH(elm, &root->dagmembers, link)
elm->obj->refcount--;
}
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