netdev - Re: [PATCH] ipv4: remove all rt cache entries on UNREGISTER event

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Message-ID: <4D120096.6080508@6wind.com>
Date:	Wed, 22 Dec 2010 14:43:50 +0100
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Octavian Purdila <opurdila@...acom.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] ipv4: remove all rt cache entries on UNREGISTER event

Yes, I saw this commit, but I still got the problem:

shelby:/home/root/src# uname -a
Linux shelby 2.6.37-rc5+ #10 SMP Wed Dec 22 05:02:53 EST 2010 i686 GNU/Linux
shelby:/home/root/src# ip tunnel add mode ipip remote 10.16.0.164 local 
10.16.0.72 dev eth0
shelby:/home/root/src# ./a.out tunl1
shelby:/home/root/src# ip tunnel del tunl1

Message from syslogd@...lby at Dec 22 10:12:08 ...
  kernel:[18459.828011] unregister_netdevice: waiting for tunl1 to become free. 
Usage count = 3

Message from syslogd@...lby at Dec 22 10:12:19 ...
  kernel:[18470.072017] unregister_netdevice: waiting for tunl1 to become free. 
Usage count = 3

Message from syslogd@...lby at Dec 22 10:12:29 ...
  kernel:[18480.316011] unregister_netdevice: waiting for tunl1 to become free. 
Usage count = 3

Message from syslogd@...lby at Dec 22 10:12:39 ...
  kernel:[18490.560010] unregister_netdevice: waiting for tunl1 to become free. 
Usage count = 3
shelby:/home/root/src#

I don't know if I will have time to investigate more before next year.

Regards,
Nicolas

Le 22.12.2010 11:07, Eric Dumazet a écrit :
> Le mercredi 22 décembre 2010 à 10:55 +0100, Eric Dumazet a écrit :
>> Le mercredi 22 décembre 2010 à 09:32 +0100, Nicolas Dichtel a écrit :
>>> What is the status of this patch? The initial problem is still here in 2.6.37-rc5+
>>>
>> I cannot reproduce the problem on net-next-2.6, are you sure we still
>> need a new patch ?
>>
>> # ip tunnel add mode ipip remote 10.16.0.164 local 10.16.0.72 dev eth0
>> # ip link show dev tunl1
>> 19: tunl1: <POINTOPOINT,NOARP> mtu 1480 qdisc noop state DOWN 
>>     link/ipip 10.16.0.72 peer 10.16.0.164
>> # /root/vrrp tunl1
>> # ip tunnel del tunl1
>>
>>
> 
> (I thought commit 332dd96f7ac15e fixed the problem for you, as it did
> for me)
> 
> net/dst: dst_dev_event() called after other notifiers
> 
> 
> 

-- 
Nicolas DICHTEL
6WIND
R&D Engineer

Tel: +33 1 39 30 92 10
Fax: +33 1 39 30 92 11
nicolas.dichtel@...nd.com
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