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@linux.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").