linux-kernel - Re: [PATCH] mm/kfence: add reboot notifier to disable KFENCE on shutdown

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Message-Id: <20251127111940.8549bd7aa82cfae5e9be1b0e@linux-foundation.org>
Date: Thu, 27 Nov 2025 11:19:40 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Breno Leitao <leitao@...ian.org>
Cc: Alexander Potapenko <glider@...gle.com>, Marco Elver <elver@...gle.com>,
 Dmitry Vyukov <dvyukov@...gle.com>, kasan-dev@...glegroups.com,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org, kernel-team@...a.com
Subject: Re: [PATCH] mm/kfence: add reboot notifier to disable KFENCE on
 shutdown

On Thu, 27 Nov 2025 03:12:10 -0800 Breno Leitao <leitao@...ian.org> wrote:

> > > This fixes a late kexec CSD lockup[1] when kfence is trying to IPI a CPU
> > > that is busy in a IRQ-disabled context printing characters to the
> > > console.
> > > 
> > > Link: https://lore.kernel.org/all/sqwajvt7utnt463tzxgwu2yctyn5m6bjwrslsnupfexeml6hkd@v6sqmpbu3vvu/ [1]
> > 
> > 6.13 kernels and earlier, so I assume we'll want a cc:stable on this. 
> > And I assume there's really no identifiable Fixes: target.
> 
> This infrastructure showed up when kfence was created, so, a possible
> Fixes: target would point to commit 0ce20dd84089  ("mm: add Kernel
> Electric-Fence infrastructure")

Great, thanks, I added that.