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b=fhtnW4u/UudPVV1QEdxmYzO3L3c6AyO1BChlBF42VEEm2BX114jT6VD/r/sYmJZWU Oz2r/nIYV+HHHfV6HEUSTkM2+APMxr11seWvxJo3p+LPiEK1Z1YTE4KEaSWIW4zACG CnuUaUh97dZrli8bxsybAZslGsEhZh1ws4vVC7Ng= Date: Fri, 7 Aug 2026 14:38:04 -0700 From: Andrew Morton To: Hui Su 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 Message-Id: <20260807143804.24cfd5710208d9a421b0e0e1@linux-foundation.org> In-Reply-To: <20260807065038.2600949-1-sh_def@163.com> References: <20260806121006.1642946-1-sh_def@163.com> <20260806135125.a444f867993cb3cd3122551e@linux-foundation.org> <20260807065038.2600949-1-sh_def@163.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: DD7C840007 X-Stat-Signature: 1wgit1gj8f7wwk9e5qke4pp5y3ruo7fs X-HE-Tag: 1786138686-184601 X-HE-Meta: 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 RDN7Sb77 2rva7VNcec5gVX0TcLPgLsorFPiptxJveLJkP7vfVZ5FKYRjai1ZQ8zgOxoOGm3e92Y8mdy3nY8DGMQqhff1LkS4PcP4Am6qQeGKkDO3vJaXqY83q1vpdgFPuZc2b8kWRBqGuCP6c7Hshdl7Ts7c4eqmtEmokauXc7Yns7Jp8i3f50HyMDnKENvu5uATjHE/yFP2dvm+9y/6eJl4EU8XGhFcyG9EbX3dnoKS/Btepw/JgyHA7ih10CuFixzGYcuK5qn9N3Gvqk4oz5HZNlInW6MeWMoE1Zm6rhUFf5p8L9sfp/79+et0mtTTs4E+k1cQcCwA9EHNHcGVYHdhUEw3NVvbQKh9XM6X0rDbE Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, 7 Aug 2026 14:50:31 +0800 Hui Su 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!