linux-kernel - Re: [PATCH stable] net: sch_generic: fix the missing new qdisc assignment bug

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Message-ID: <20201113035119.GA1914997@google.com>
Date:   Thu, 12 Nov 2020 19:51:19 -0800
From:   Brian Norris <briannorris@...omium.org>
To:     Yunsheng Lin <linyunsheng@...wei.com>
Cc:     gregkh@...uxfoundation.org, stable@...r.kernel.org,
        vpai@...mai.com, Joakim.Tjernlund@...inera.com,
        xiyou.wangcong@...il.com, johunt@...mai.com, jhs@...atatu.com,
        jiri@...nulli.us, davem@...emloft.net, kuba@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxarm@...wei.com, john.fastabend@...il.com,
        eric.dumazet@...il.com, dsahern@...il.com
Subject: Re: [PATCH stable] net: sch_generic: fix the missing new qdisc
 assignment bug

On Tue, Nov 03, 2020 at 11:25:38AM +0800, Yunsheng Lin wrote:
> commit 2fb541c862c9 ("net: sch_generic: aviod concurrent reset and enqueue op for lockless qdisc")
> 
> When the above upstream commit is backported to stable kernel,
> one assignment is missing, which causes two problems reported
> by Joakim and Vishwanath, see [1] and [2].
> 
> So add the assignment back to fix it.
> 
> 1. https://www.spinics.net/lists/netdev/msg693916.html
> 2. https://www.spinics.net/lists/netdev/msg695131.html
> 
> Fixes: 749cc0b0c7f3 ("net: sch_generic: aviod concurrent reset and enqueue op for lockless qdisc")
> Signed-off-by: Yunsheng Lin <linyunsheng@...wei.com>

For whatever it's worth, we've seen similar problems (particularly,
ENOBUFS on AF_PACKET sockets) and have tested this fix on 4.19.y (we're
also queueing it up on our 5.4.y branch, but haven't tested it as much):

Tested-by: Brian Norris <briannorris@...omium.org>

Thanks!