netdev - Re: Fw: oops during unregister_netdevice interface enslaved to bond

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Message-ID: <20110510142047.GB39624@tuxmaker.boeblingen.de.ibm.com>
Date:	Tue, 10 May 2011 16:20:47 +0200
From:	Frank Blaschka <blaschka@...ux.vnet.ibm.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-s390@...r.kernel.org, ELELUECK@...ibm.com
Subject: Re: Fw: oops during unregister_netdevice interface enslaved to
	bond - regression

On Tue, May 10, 2011 at 03:36:59PM +0200, Eric Dumazet wrote:
> Le mardi 10 mai 2011 à 15:14 +0200, Frank Blaschka a écrit :
> 
> > I just checked todays net-next tree, problem is still there.
> > I don't have an x86 box, but I was able to reproduce the problem
> > with the dummy device (on s/390)
> > 
> > # modprobe bonding
> > # modprobe dummy
> > # ifconfig bond0 up
> > # ifenslave bond0 dummy0
> > # rmmod dummy
> 
> Here is the patch to fix this problem
>
Hi Eric,

your patch did the trick. With the patch applied I could not
reproduce the problem anyhow I use real or dummy device.

Thx for your help!
 
> Thanks again for your help.
> 
> [PATCH net-2.6] net: dev_close() should check IFF_UP
> 
> Commit 443457242beb (factorize sync-rcu call in
> unregister_netdevice_many) mistakenly removed one test from dev_close()
> 
> Following actions trigger a BUG :
> 
> modprobe bonding
> modprobe dummy
> ifconfig bond0 up
> ifenslave bond0 dummy0
> rmmod dummy
> 
> dev_close() must not close a non IFF_UP device.
> 
> With help from Frank Blaschka and Einar EL Lueck
> 
> Reported-by: Frank Blaschka <blaschka@...ux.vnet.ibm.com>
> Reported-by: Einar EL Lueck <ELELUECK@...ibm.com>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> CC: Octavian Purdila <opurdila@...acom.com>
> ---
>  net/core/dev.c |   10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 856b6ee..9200944 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -1284,11 +1284,13 @@ static int dev_close_many(struct list_head *head)
>   */
>  int dev_close(struct net_device *dev)
>  {
> -	LIST_HEAD(single);
> +	if (dev->flags & IFF_UP) {
> +		LIST_HEAD(single);
> 
> -	list_add(&dev->unreg_list, &single);
> -	dev_close_many(&single);
> -	list_del(&single);
> +		list_add(&dev->unreg_list, &single);
> +		dev_close_many(&single);
> +		list_del(&single);
> +	}
>  	return 0;
>  }
>  EXPORT_SYMBOL(dev_close);
> 
> 
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