linux-kernel - Re: 2.6.33 dies on modprobe

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 3 Mar 2010 14:24:20 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	M G Berberich <berberic@....uni-passau.de>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	linux-kernel@...r.kernel.org,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: 2.6.33 dies on modprobe

On Wed, 3 Mar 2010 23:16:02 +0100
M G Berberich <berberic@....uni-passau.de> wrote:

> Hello,
> 
> Am Dienstag, den 02. M__rz schrieb Andrew Morton:
> 
> > It could be that some kobject on that list has become invalid (memory
> > was freed, module was unloaded, etc) and later code stumbled across the
> > now-invalid object on that list and then crashed.
> > 
> > What we can do to find this is to add a diagnostic each time an object
> > is registered, and a diagnostic each time kset_find_obj() looks at the
> > objects.  Then we'll see which kobject caused the crash, then we can
> > look back and see where that kobject was registered from.
> 
> [...]
> 
> > This will generate a lot of output and we don't want to lose any of it.
> >  I'd suggest setting up netconsole so all the output can be reliably
> > saved: Documentation/networking/netconsole.txt
> 
> I have a serial connection to a netbook. Log attached.

drat, my patch didn't work.  Can you try this one please?

--- a/lib/kobject.c~a
+++ a/lib/kobject.c
@@ -126,6 +126,8 @@ static void kobj_kset_join(struct kobjec
 
 	kset_get(kobj->kset);
 	spin_lock(&kobj->kset->list_lock);
+	printk("kobj_kset_join:%p\n", kobj);
+	dump_stack();
 	list_add_tail(&kobj->entry, &kobj->kset->list);
 	spin_unlock(&kobj->kset->list_lock);
 }
@@ -751,9 +753,12 @@ struct kobject *kset_find_obj(struct kse
 
 	spin_lock(&kset->list_lock);
 	list_for_each_entry(k, &kset->list, entry) {
-		if (kobject_name(k) && !strcmp(kobject_name(k), name)) {
-			ret = kobject_get(k);
-			break;
+		if (kobject_name(k)) {
+			printk("kset_find_obj:%p\n", k);
+			if (!strcmp(kobject_name(k), name)) {
+				ret = kobject_get(k);
+				break;
+			}
 		}
 	}
 	spin_unlock(&kset->list_lock);
_

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/