netdev - Re: route add default fails with ESRCH?

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Message-ID: <4F4541E5.5040700@fb.com>
Date:	Wed, 22 Feb 2012 11:28:37 -0800
From:	Arun Sharma <asharma@...com>
To:	<netdev@...r.kernel.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Stephen Hemminger <shemminger@...tta.com>
Subject: Re: route add default fails with ESRCH?

[ Expanded cc ]

On 2/17/12 5:39 PM, Arun Sharma wrote:
>
> I've been trying to debug this strange problem with recent 3.2 kernels:
>
> # boot to single user mode
> # service network start
> # ifconfig eth0
> eth0 Link encap:Ethernet HWaddr <blah>
> inet addr:10.47.46.39 Bcast:10.47.46.255 Mask:255.255.255.0
>
> <Link is up>
> # strace route add default gw 10.47.46.1
> ioctl(3, SIOCADDRT, 0x7fff1fd4db80) = -1 ESRCH (No such process)

I git bisected the problem to this commit:

commit 3630b7c050d9c3564f143d595339fc06b888d6f3
Author: David S. Miller <davem@...emloft.net>
Date: Tue Feb 1 15:15:39 2011 -0800

ipv4: Remove fib_hash.

which came in via 2.6.39.

 > If there are any semantic differences found in fib_trie, we should
 > simply fix them.

Looks like the problem I'm running into falls into this bucket (since it 
goes away if I revert the commit).

I changed the pr_debug() in fib_trie.c to pr_info() and got some debug 
output (attached).

Based on the debug info, I think it's this call that's failing with ESRCH:

[   69.189627] Insert table=254 00000000/0

/sbin/route -V
net-tools 1.60
route 1.98 (2001-04-15)

# cat /proc/net/fib_trie
Local:
   +-- 0.0.0.0/1 1 0 0
      +-- 10.47.46.0/24 1 0 0
         +-- 10.47.46.0/26 1 0 0
            |-- 10.47.46.0
               /32 link BROADCAST
            |-- 10.47.46.39
               /32 host LOCAL
         |-- 10.47.46.255
            /32 link BROADCAST
      +-- 127.0.0.0/8 1 0 0
         +-- 127.0.0.0/31 1 0 0
            |-- 127.0.0.0
               /32 link BROADCAST
               /8 host LOCAL
            |-- 127.0.0.1
               /32 host LOCAL
         |-- 127.255.255.255
            /32 link BROADCAST

Please let me know if you have any suggestions.

  -Arun

View attachment "fib_debug.txt" of type "text/plain" (4074 bytes)