netdev - Re: [PATCH net v1 1/3] net/smc: fix dangling sock under state SMC

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Date: Thu, 2 Nov 2023 21:28:07 +0800
From: "D. Wythe" <alibuda@...ux.alibaba.com>
To: Wenjia Zhang <wenjia@...ux.ibm.com>, kgraul@...ux.ibm.com,
 jaka@...ux.ibm.com, wintera@...ux.ibm.com
Cc: kuba@...nel.org, davem@...emloft.net, netdev@...r.kernel.org,
 linux-s390@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [PATCH net v1 1/3] net/smc: fix dangling sock under state
 SMC_APPFINCLOSEWAIT

On 11/2/23 6:34 PM, Wenjia Zhang wrote:
>
>
> On 02.11.23 06:52, D. Wythe wrote:
>> From: "D. Wythe" <alibuda@...ux.alibaba.com>
>>
>> Considering scenario:
>>
>>                 smc_cdc_rx_handler
>> __smc_release
>>                 sock_set_flag
>> smc_close_active()
>> sock_set_flag
>>
>> __set_bit(DEAD)            __set_bit(DONE)
>>
>> Dues to __set_bit is not atomic, the DEAD or DONE might be lost.
>> if the DEAD flag lost, the state SMC_CLOSED  will be never be reached
>> in smc_close_passive_work:
>>
>> if (sock_flag(sk, SOCK_DEAD) &&
>>     smc_close_sent_any_close(conn)) {
>>     sk->sk_state = SMC_CLOSED;
>> } else {
>>     /* just shutdown, but not yet closed locally */
>>     sk->sk_state = SMC_APPFINCLOSEWAIT;
>> }
>>
>> Replace sock_set_flags or __set_bit to set_bit will fix this problem.
>> Since set_bit is atomic.
>>
>> Signed-off-by: D. Wythe <alibuda@...ux.alibaba.com>
>> Reviewed-by: Dust Li <dust.li@...ux.alibaba.com>
>
> Fixes tag?

ops, i forget that. 🙁
I will fix it in next version.

Thanks.
D. Wythe