netdev - Re: what's causing "ip_rt

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Date:	Fri, 17 Jun 2011 22:36:33 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Tomasz Chmielewski <mangoo@...g.org>
Cc:	netdev@...r.kernel.org
Subject: Re: what's causing "ip_rt_bug"?

Le vendredi 17 juin 2011 à 22:00 +0200, Tomasz Chmielewski a écrit :
> I have a system pushing around 800 Mbit/s, ~130 kpps.
> 
> It uses 2.6.35.12 kernel.
> 
> 
> Several times a minute, I can see entries like (a.b.c.d - IP of this system):
> 
> Jun 18 02:39:19 KOR-SV22 kernel: [37187.665951] ip_rt_bug: 110.x.x.x -> a.b.c.d, ?
> Jun 18 02:39:19 KOR-SV22 kernel: [37187.685419] ip_rt_bug: 110.x.x.x -> a.b.c.d, ?
> Jun 18 02:40:31 KOR-SV22 kernel: [37259.199315] ip_rt_bug: 124.x.x.x -> a.b.c.d, ?
> Jun 18 02:40:36 KOR-SV22 kernel: [37263.828000] ip_rt_bug: 124.x.x.x -> a.b.c.d, ?
> Jun 18 02:44:16 KOR-SV22 kernel: [37484.120689] ip_rt_bug: 110.x.x.x -> a.b.c.d, ?
> Jun 18 02:44:19 KOR-SV22 kernel: [37487.114357] ip_rt_bug: 110.x.x.x -> a.b.c.d, ?
> 

Hi

What your routing table looks like ? (ip ro)

You also could backport this patch so that we can catch where/why this
happens

commit c378a9c019cf5e017d1ed24954b54fae7bebd2bc
Author: Dave Jones <davej@...hat.com>
Date:   Sat May 21 07:16:42 2011 +0000

    ipv4: Give backtrace in ip_rt_bug().
    
    Add a stack backtrace to the ip_rt_bug path for debugging
    
    Signed-off-by: Dave Jones <davej@...hat.com>
    Signed-off-by: David S. Miller <davem@...emloft.net>

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index b24d58e..52b0b95 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1665,6 +1665,7 @@ static int ip_rt_bug(struct sk_buff *skb)
 		&ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr,
 		skb->dev ? skb->dev->name : "?");
 	kfree_skb(skb);
+	WARN_ON(1);
 	return 0;
 }
 



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