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

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Message-ID: <1291914474.4063.68.camel@edumazet-laptop>
Date:	Thu, 09 Dec 2010 18:07:54 +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 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.



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