linux-kernel - Re: [PATCH AUTOSEL 5.15 10/39] net/smc: Transfer remaining wait queue entries during fallback

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Message-ID: <20211125185139.0007069f@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Thu, 25 Nov 2021 18:51:39 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Wen Gu <guwen@...ux.alibaba.com>,
        Tony Lu <tonylu@...ux.alibaba.com>,
        "David S . Miller" <davem@...emloft.net>, kgraul@...ux.ibm.com,
        linux-s390@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.15 10/39] net/smc: Transfer remaining wait
 queue entries during fallback

On Thu, 25 Nov 2021 21:31:27 -0500 Sasha Levin wrote:
> From: Wen Gu <guwen@...ux.alibaba.com>
> 
> [ Upstream commit 2153bd1e3d3dbf6a3403572084ef6ed31c53c5f0 ]
> 
> The SMC fallback is incomplete currently. There may be some
> wait queue entries remaining in smc socket->wq, which should
> be removed to clcsocket->wq during the fallback.
> 
> For example, in nginx/wrk benchmark, this issue causes an
> all-zeros test result:

Hold this one, please, there is a fix coming: 7a61432dc813 ("net/smc:
Avoid warning of possible recursive locking").