netdev - Re: [PATCH net 1/2] net/sched: act_ct: fix restore the qdisc_skb

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Message-Id: <20200702.142505.302089629790561856.davem@davemloft.net>
Date:   Thu, 02 Jul 2020 14:25:05 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     wenxu@...oud.cn
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net 1/2] net/sched: act_ct: fix restore the
 qdisc_skb_cb after defrag

From: wenxu <wenxu@...oud.cn>
Date: Thu, 2 Jul 2020 17:17:47 +0800

> On 7/2/2020 6:21 AM, David Miller wrote:
>> From: wenxu@...oud.cn
>> Date: Mon, 29 Jun 2020 17:16:17 +0800
>>
>> Nothing can clobber the qdisc_skb_cb like this in these packet flows
>> otherwise we will have serious crashes and problems.  Some packet
>> schedulers store pointers in the qdisc CB private area, for example.
> Why store all the cb private and restore it can't total fix this?

Parallel accesses to the SKB.