From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: [PATCH RFC] net: Fix race condition when removing qdisc
Date: Thu, 03 Mar 2016 16:37:55 -0800
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Cc: Cong Wang <xiyou.wangcong@gmail.com>,
	Linux Kernel Network Developers <netdev@vger.kernel.org>,
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	Kernel Team <kernel-team@fb.com>
To: Tom Herbert <tom@herbertland.com>
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On jeu., 2016-03-03 at 16:24 -0800, Tom Herbert wrote:

> I suppose that case is protected by est_lock and e->bstats == NULL.

Yes, c7de2cf053420d63bac85133469c965d4b1083e1 was supposed
to fix some issues ...