linux-kernel - Re: 2.6.25-mm1: not looking good

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Date:	Thu, 17 Apr 2008 18:35:38 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Paul Moore <paul.moore@...com>
Cc:	mingo@...e.hu, tglx@...utronix.de, penberg@...helsinki.fi,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, jmorris@...ei.org, sds@...ho.nsa.gov
Subject: Re: 2.6.25-mm1: not looking good

On Thu, 17 Apr 2008 19:55:46 -0400
Paul Moore <paul.moore@...com> wrote:

> > security/selinux/netnode.c looks to be doing simple old
> > kzalloc/kfree, so I'd be suspecting slab.  But there are significant
> > changes netnode.c in git-selinux.
> >
> > I have maybe two hours in which to weed out whatever
> > very-recently-added dud patches are causing this.  Any suggestions
> > are welcome.
> 
> For what it's worth I just looked over the changes in netnode.c and 
> nothing is jumping out at me.  The changes ran fine for me when tested 
> on the later 2.6.25-rcX kernels but I suppose that doesn't mean a whole 
> lot.
> 
> I've got a 4-way x86_64 box but it needs to be installed (which means 
> I'm not going to be able to do anything useful with it until tomorrow 
> at the earliest).  I'll try it out and see if I can recreate the 
> problem.

I dropped git-selinux and that crash seems to have gone away.  It took about
five minutes before, but would presumably have happened earlier if I'd
reduced the cache size.

btw, wouldn't this

--- a/security/selinux/netnode.c~a
+++ a/security/selinux/netnode.c
@@ -190,7 +190,7 @@ static int sel_netnode_insert(struct sel
 	if (sel_netnode_hash[idx].size == SEL_NETNODE_HASH_BKT_LIMIT) {
 		struct sel_netnode *tail;
 		tail = list_entry(node->list.prev, struct sel_netnode, list);
-		list_del_rcu(node->list.prev);
+		list_del_rcu(&tail->list);
 		call_rcu(&tail->rcu, sel_netnode_free);
 	} else
 		sel_netnode_hash[idx].size++;
_

be a bit clearer?  If it's correct - I didn't try too hard :)
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