netdev - Re: [PATCH] sctp: fix potential deadlock on &net->sctp.addr_wq

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Date: Thu, 29 Jun 2023 10:00:21 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Chengfeng Ye <dg573847474@...il.com>
Cc: marcelo.leitner@...il.com, lucien.xin@...il.com, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
 linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sctp: fix potential deadlock on &net->sctp.addr_wq_lock

Hello:

This patch was applied to netdev/net.git (main)
by Paolo Abeni <pabeni@...hat.com>:

On Tue, 27 Jun 2023 12:03:40 +0000 you wrote:
> As &net->sctp.addr_wq_lock is also acquired by the timer
> sctp_addr_wq_timeout_handler() in protocal.c, the same lock acquisition
> at sctp_auto_asconf_init() seems should disable irq since it is called
> from sctp_accept() under process context.
> 
> Possible deadlock scenario:
> sctp_accept()
>     -> sctp_sock_migrate()
>     -> sctp_auto_asconf_init()
>     -> spin_lock(&net->sctp.addr_wq_lock)
>         <timer interrupt>
>         -> sctp_addr_wq_timeout_handler()
>         -> spin_lock_bh(&net->sctp.addr_wq_lock); (deadlock here)
> 
> [...]

Here is the summary with links:
  - sctp: fix potential deadlock on &net->sctp.addr_wq_lock
    https://git.kernel.org/netdev/net/c/6feb37b3b06e

You are awesome, thank you!
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