From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 586912D249E for ; Wed, 28 Jan 2026 08:36:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769589413; cv=none; b=NbM71JYXhxULWCnFw86Cy06t7j2nKvsIxKbiit3qJgcEYUrYWd5x4Urp/DRjLq1HE6QZS+NVUzQK+UgZhs+/p5wWucHxqco7dTuPz89npP824ENVAKHH+PNmc6c+OwypZRvVZgBl4x4eJaSq6qABvqtjL9l/XhDz/X1HpVLnBBc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769589413; c=relaxed/simple; bh=44OQ69+EJtdieW2S+picHo84+SY4AKAUtEZNI1/FBsc=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=T1Gt67fVeJy+NbVA8vwLEC8w3PY7MW2QRmmkGGwYBWGTOma3eOyLup8K5pJrGr2dj4pmszlLk3Ve61WIPtIvFRjqXpbBdJyWqTPtE4eOrbAqBlzNe8RyQgkehaq7npvS9NHE2kEjqcuQ6WaLpPmqTxye8E29uEWcUH74vshFVgc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=BgMYIOZW; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="BgMYIOZW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 64C07C4CEF1; Wed, 28 Jan 2026 08:36:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1769589412; bh=44OQ69+EJtdieW2S+picHo84+SY4AKAUtEZNI1/FBsc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=BgMYIOZW5Cd2k96pR8ZmeRHndxWLj886tlVFHgF59nc1mCIdQvvJ3j8H6YoftGWkv tE6KCGBDc7+9ZnbvK+B30fxaloif088vGq5ZIdge8GnLYQebT/QXTbAj8Nso3070ya ypcvgs+my0IayO0fiKJOyUUledMgkiTZATmM/apE= Date: Wed, 28 Jan 2026 09:36:49 +0100 From: Greg Kroah-Hartman To: Jari Ruusu Cc: Sasha Levin , Jon Kohler , Rahul Chunduru , Harshit Agarwal , "linux-kernel@vger.kernel.org" Subject: Re: "sched/rt: Fix race in push_rt_task" linux kernel patch backports Message-ID: <2026012823-displace-tattered-93cf@gregkh> References: <509103F3-EF26-48E9-8D65-79F269516BEE@nutanix.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Wed, Jan 28, 2026 at 07:38:25AM +0000, Jari Ruusu wrote: > Jari Ruusu 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 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