netdev - Re: [PATCH RFC] net: Fix race condition when removing qdisc

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Message-ID: <CAM_iQpWxkd16A_=htGxjA6OVBj_kzBZKsOF-JmsQQLbJc=r_WA@mail.gmail.com>
Date:	Tue, 1 Mar 2016 22:34:17 -0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Tom Herbert <tom@...bertland.com>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	brakmo@...com, kernel-team@...com
Subject: Re: [PATCH RFC] net: Fix race condition when removing qdisc

On Tue, Mar 1, 2016 at 3:16 PM, Tom Herbert <tom@...bertland.com> wrote:
> We are seeing a number of softlockups occurring with HTB upon removing
> the qdisc. We are still attempting to repro the exact circumstances,
> however looking at the code I'm very suspicious of this block in
> net_tx_action and its interaction with dev_deactivate (called through
> tc_modify_qdisc):


Do you mind to share the stack trace of these soft lockups with us?

Thanks.