linux-kernel - Re: "sched/rt: Fix race in push_rt_task" linux kernel patch backports

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Message-ID: <2026012823-displace-tattered-93cf@gregkh>
Date: Wed, 28 Jan 2026 09:36:49 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Jari Ruusu <jariruusu@...tonmail.com>
Cc: Sasha Levin <sashal@...nel.org>, Jon Kohler <jon@...anix.com>,
	Rahul Chunduru <rahul.chunduru@...anix.com>,
	Harshit Agarwal <harshit@...anix.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: "sched/rt: Fix race in push_rt_task" linux kernel patch backports

On Wed, Jan 28, 2026 at 07:38:25AM +0000, Jari Ruusu wrote:
> Jari Ruusu <jariruusu@...tonmail.com> wrote:                                 
> >> Sorry to bother you with this question, but subject line mentioned linux 
> >> kernel patch (upstream commit 690e47d1403e90b7f2366f03b52ed3304194c793) 
> >> seems to be in 6.18.y and 6.12.y kernel branches, but does not seem 
> >> be backported to older stable branches such as 6.6.y and 6.1.y . 
> >> 
> >> To me, that patch you authored seems to be critically important, and 
> >> older kernel branches appear to have exact same race, but I am not 
> >> an expert on this, so I am asking you. 
> >> 
> >> Should that "sched/rt: Fix race in push_rt_task" patch be backported 
> >> to older stable kernel branches too? 
> >> 
> >> If, in your opinion, that patch should be backported to older stable 
> >> branches, is there any chance of you pinging Greg Kroah-Hartman 
> >> and Sasha Levin about it? 
>  
> Harshit Agarwal <harshit@...anix.com> wrote:
> > Yes, the fix is applicable to older branches that you mentioned.
> > In fact I see that they ported my similar fix in the deadline   
> > scheduler to 6.1.x and 6.6.x.
> >
> > If you don't see the rt fix then can you please reach out to them and
> > feel free to add me to the thread?
>  
> Greg, Sasha,
>  
> Important upstream "sched/rt: Fix race in push_rt_task", commit
> 690e47d1403e90b7f2366f03b52ed3304194c793, is present in 6.18.y
> and 6.12.y kernel branches, but seems to be missing from older
> kernel branches.
>  
> Any chance backporting that race fix to older kernel branches?

It does not apply cleanly to older kernel branches.  So if it is needed
there, please provide a working backport and we will be glad to consider
it.

thanks,

greg k-h