linux-kernel - Re: [PATCH] RDMA/rxe: Fix race condition in QP timer handlers

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Message-ID: <20260128100226.GB12149@unreal>
Date: Wed, 28 Jan 2026 12:02:26 +0200
From: Leon Romanovsky <leon@...nel.org>
To: "Zhijian Li (Fujitsu)" <lizhijian@...itsu.com>
Cc: "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"zyjzyj2000@...il.com" <zyjzyj2000@...il.com>,
	"jgg@...pe.ca" <jgg@...pe.ca>
Subject: Re: [PATCH] RDMA/rxe: Fix race condition in QP timer handlers

On Tue, Jan 27, 2026 at 09:27:27AM +0000, Zhijian Li (Fujitsu) wrote:
> 
> 
> On 25/01/2026 22:08, Leon Romanovsky wrote:
> >> Ensure the QP's reference count is maintained and its validity is checked
> >> within the timer callbacks by adding calls to rxe_get(qp) and corresponding
> >> rxe_put(qp) after use.
> >>
> >> Signed-off-by: Li Zhijian<lizhijian@...itsu.com>
> > Fixes line?
> 
> I believe the following `Fixes` tag is appropriate, as this commit introduced
> the WARN_ON that now triggers:
>   
> Fixes: d94671632572 ("RDMA/rxe: Rewrite rxe_task.c")
>   
> However, I'm not entirely certain if this race condition also existed
> before this commit, as it involved a significant rewrite.

Let's include the most recent fix. It is unlikely that anyone is still
running such an old version of RXE.

Thanks

> 
> Thanks
> Zhijian
> 
> > 
> > Thanks