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Date: Sun, 19 Oct 2025 14:05:17 +0200
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Oleg Nesterov <oleg@redhat.com>
Cc: stable@vger.kernel.org, patches@lists.linux.dev,
	Christian Brauner <brauner@kernel.org>,
	Sasha Levin <sashal@kernel.org>,
	=?utf-8?B?6auY57+U?= <gaoxiang17@xiaomi.com>
Subject: Re: [PATCH 6.1 163/168] pid: make __task_pid_nr_ns(ns => NULL) safe
 for zombie callers
Message-ID: <2025101904-fantasy-creamlike-a8f0@gregkh>
References: <20251017145129.000176255@linuxfoundation.org>
 <20251017145135.053471068@linuxfoundation.org>
 <20251017153126.GD21102@redhat.com>
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In-Reply-To: <20251017153126.GD21102@redhat.com>

On Fri, Oct 17, 2025 at 05:31:26PM +0200, Oleg Nesterov wrote:
> On 10/17, Greg Kroah-Hartman wrote:
> >
> > 6.1-stable review patch.  If anyone has any objections, please let me know.
> 
> Well, I don't think this is a -stable material...
> 
> This patch tried to make the usage of __task_pid_nr_ns() more simple/safe,
> but I don't think we have the problematic users right now.
> 
> And please see
> 
> 	[PATCH 1/2] Revert "pid: make __task_pid_nr_ns(ns => NULL) safe for zombie callers"
> 	https://lore.kernel.org/all/20251015123613.GA9456@redhat.com/
> 
> because we have another commit 006568ab4c5c ("pid: Add a judgment for ns null in pid_nr_ns").
> Which too (imo) is not for -stable. The panic fixed by this patch was caused
> by the out-of-tree and buggy code.

Thanks for letting me know, I'll go drop this patch from all stable
queues now.

greg k-h