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Date:   Mon, 01 Aug 2022 19:50:13 +0000
To:     Hangyu Hua <>
Subject: Re: [PATCH v2] dccp: put dccp_qpolicy_full() and dccp_qpolicy_push() in
 the same lock


This patch was applied to netdev/net.git (master)
by Jakub Kicinski <>:

On Fri, 29 Jul 2022 19:00:27 +0800 you wrote:
> In the case of sk->dccps_qpolicy == DCCPQ_POLICY_PRIO, dccp_qpolicy_full
> will drop a skb when qpolicy is full. And the lock in dccp_sendmsg is
> released before sock_alloc_send_skb and then relocked after
> sock_alloc_send_skb. The following conditions may lead dccp_qpolicy_push
> to add skb to an already full sk_write_queue:
> thread1--->lock
> thread1--->dccp_qpolicy_full: queue is full. drop a skb
> thread1--->unlock
> thread2--->lock
> thread2--->dccp_qpolicy_full: queue is not full. no need to drop.
> thread2--->unlock
> thread1--->lock
> thread1--->dccp_qpolicy_push: add a skb. queue is full.
> thread1--->unlock
> thread2--->lock
> thread2--->dccp_qpolicy_push: add a skb!
> thread2--->unlock
> [...]

Here is the summary with links:
  - [v2] dccp: put dccp_qpolicy_full() and dccp_qpolicy_push() in the same lock

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