netdev - Re: 2.6.23 WARNING: at kernel/softirq.c:139 local_bh

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Date:	Fri, 23 Nov 2007 21:59:06 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Simon Arlott <simon@...e.lp0.eu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org, Ingo Molnar <mingo@...hat.com>
Subject: Re: 2.6.23 WARNING: at kernel/softirq.c:139 local_bh_enable()

On Fri, Nov 23, 2007 at 09:51:01PM +0300, Evgeniy Polyakov (johnpol@....mipt.ru) wrote:
> On Fri, Nov 23, 2007 at 09:48:51PM +0300, Evgeniy Polyakov (johnpol@....mipt.ru) wrote:
> > Stop, we are trying to free skb without destructor and catch connection
> > tracking, so it is not a solution. To fix the problem we need to check
> > if it is not netfilter related, kind of this (not tested), Simon please
> > give it a try:
> 
> And to be really cool we need to bypass skbs with xfrm attached, since
> its freeing also assumes BH context.

What about compile options?

Signed-off-by: Evgeniy Polyakov <johnpol@....mipt.ru>

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 758dafe..adb3c54 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -196,10 +196,25 @@ static void zap_completion_queue(void)
 		while (clist != NULL) {
 			struct sk_buff *skb = clist;
 			clist = clist->next;
-			if (skb->destructor)
+			if (skb->destructor) {
 				dev_kfree_skb_any(skb); /* put this one back */
-			else
-				__kfree_skb(skb);
+				continue;
+			}
+
+#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
+			if (skb->nfct || skb->nfct_reasm) {
+				dev_kfree_skb_any(skb); /* put this one back */
+				continue;
+			}
+#endif
+
+#ifdef CONFIG_XFRM
+			if (skb->sp) {
+				dev_kfree_skb_any(skb); /* put this one back */
+				continue;
+			}
+#endif
+			__kfree_skb(skb);
 		}
 	}
 

-- 
	Evgeniy Polyakov
-
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