linux-kernel - Re: [regression, 2.6.37-rc1] 'ip link tap0 up' stuck in do

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Date:	Thu, 09 Dec 2010 18:09:29 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Florian Mickler <florian@...kler.org>,
	Ingo Molnar <mingo@...e.hu>,
	Dave Chinner <david@...morbit.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [regression, 2.6.37-rc1] 'ip link tap0 up' stuck in do_exit()

Le jeudi 09 décembre 2010 à 18:07 +0100, Eric Dumazet a écrit :
> Le vendredi 10 décembre 2010 à 00:47 +0800, Américo Wang a écrit :
> 
> > Yeah, there is no point that a zombie can trigger a BUG_ON in kenrel.
> > But it is still interesting to know why it becomes a zombie...
> > 
> 
> A zombie is very easy to get.
> 
> Technically speaking, all processes die and become zombies, unless
> parent said : signal(SIGCLD, SIG_IGN) before fork()
> 
> The parent is buggy (sudo in this case ?) and doesnt call wait() to
> 'free' one of its children.
> 
> 

Before you ask :)

If the parent dies before the child, task is re-parented to init.

Then, with namespaces, I dont know what happens (is there one init per
namespace ?)




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