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

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Message-ID: <V2MM9ljyF6PGt5ucnQnEfINZwUruiYJjACLxA1GVPpyG86xTZNhBEgG3wnglqW-mk6I-jx3pHU5w92fuw4drtmZqx7WGRQvXmClB1o8IuXo=@protonmail.com>
Date: Wed, 28 Jan 2026 07:38:25 +0000
From: Jari Ruusu <jariruusu@...tonmail.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Sasha Levin <sashal@...nel.org>
Cc: 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

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?
 
> BTW, are you seeing this issue on this branch? Just curious.
 
I have not seen that race trigger on any kernel branch.

--
Jari Ruusu  4096R/8132F189 12D6 4C3A DCDA 0AA4 27BD  ACDF F073 3C80 8132 F189