netdev - Re: RFC Hanging clean-up of a namespace

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Message-Id: <20120119.124002.1964667767933832927.davem@davemloft.net>
Date:	Thu, 19 Jan 2012 12:40:02 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	hans.schillstrom@...csson.com
Cc:	netdev@...r.kernel.org, ebiederm@...ssion.com
Subject: Re: RFC Hanging clean-up of a namespace

From: Hans Schillstrom <hans.schillstrom@...csson.com>
Date: Thu, 19 Jan 2012 12:07:09 +0100

> Closing of a namespace (container) can be delayed by ~ 2 minutes 
> due to tcp timers ex tcp time wait (and of cource other things too).
> 
> I think there should be some kind of "forced close" of the Network stack
> in ex free_nsproxy() 

I think this is unwise.

Keeping the timewait sockets around is necessary to absorb any lingering
packets in the network meant for those sockets.

If you truncate this activity, and then try to create another socket with
the same ID you'll run into the very problems time-wait is meant to
solve.

It's an unfortunate delay, but one you will have to live with.
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