netdev - Re: [RFC PATCH net-next 00/11] netns: don't switch namespace while creating kernel sockets

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Message-ID: <CAHA+R7MKra6U4ESu9LvE2f9YGXaD5CZ-DLziNHfWhej+AKH6tg@mail.gmail.com>
Date:	Fri, 8 May 2015 09:33:26 -0700
From:	Cong Wang <cwang@...pensource.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Ying Xue <ying.xue@...driver.com>, netdev <netdev@...r.kernel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Pavel Emelyanov <xemul@...nvz.org>,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>, maxk@....qualcomm.com,
	Stephen Hemminger <stephen@...workplumber.org>,
	Thomas Graf <tgraf@...g.ch>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	Tom Herbert <tom@...bertland.com>,
	James Chapman <jchapman@...alix.com>,
	Erik Hugne <erik.hugne@...csson.com>, jon.maloy@...csson.com,
	Simon Horman <horms@...ge.net.au>
Subject: Re: [RFC PATCH net-next 00/11] netns: don't switch namespace while
 creating kernel sockets

On Fri, May 8, 2015 at 4:07 AM, Eric W. Biederman <ebiederm@...ssion.com> wrote:
>
> I agree which is why my implementation of lock_network_namespaces below
> loops until there are no exiting network namespaces.
>

It is easy to have live lock since you keep dropping and acquire netns mutex
in a loop.
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