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Date: Fri, 7 Aug 2026 14:38:04 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Hui Su <sh_def@163.com>
Cc: ryabinin.a.a@gmail.com, glider@google.com, andreyknvl@gmail.com,
 dvyukov@google.com, vincenzo.frascino@arm.com, qiang1.zhang@intel.com,
 kasan-dev@googlegroups.com, linux-mm@kvack.org,
 linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH] kasan: fix cache shrink race with CPU hotplug
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On Fri,  7 Aug 2026 14:50:31 +0800 Hui Su <sh_def@163.com> wrote:

> > Especially when proposing a backport.  At present we've provided our
> > -stable recipients no reason to accept the patch.
> > 
> > Documentation/process/stable-kernel-rules.rst says "it must fix a real
> > bug that bothers people".
> > 
> 
> Yes, I agree. I did not include the real bug dmesg in the original
> changelog, which made the stable rationale unclear.
> 
> The 9p case above shows that this is a real bug: a userspace-triggered
> teardown path can leave objects in the 9p fcall cache and report the slab
> shutdown warning after umount.

OK, thanks.

> Should I keep Cc: stable in PATCH v2 with this dmesg and
> userspace-visible effect added to the changelog?

Yes please!