netdev - Re: [PATCH 2/2] IPVS netns shutdown/startup dead-lock (Take II)

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Message-ID: <alpine.LFD.2.00.1110032350500.1868@ja.ssi.bg>
Date:	Mon, 3 Oct 2011 23:55:02 +0300 (EEST)
From:	Julian Anastasov <ja@....bg>
To:	Hans Schillstrom <hans.schillstrom@...csson.com>
cc:	horms@...ge.net.au, wensong@...ux-vs.org,
	lvs-devel@...r.kernel.org, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org, hans@...illstrom.com
Subject: Re: [PATCH 2/2] IPVS netns shutdown/startup dead-lock (Take II)


	Hello,

On Mon, 3 Oct 2011, Hans Schillstrom wrote:

> From: Hans Schillstrom <hans@...illstrom.com>
> 
> ip_vs_mutext is used by both netns shutdown code and startup
> and both implicit uses sk_lock-AF_INET mutex.
> 
> cleanup CPU-1         startup CPU-2
> ip_vs_dst_event()     ip_vs_genl_set_cmd()
>  sk_lock-AF_INET     __ip_vs_mutex
>                      sk_lock-AF_INET
> __ip_vs_mutex
> * DEAD LOCK *
> 
> A new mutex placed in ip_vs netns struct called sync_mutex is added.
> 
> Comments from Julian and Simon added.
> This patch has been running for more than 3 month now and it seems to work.

	May be IP_VS_SO_GET_DAEMON in do_ip_vs_get_ctl
must be protected by sync_mutex in a similar way.

Regards

--
Julian Anastasov <ja@....bg>
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