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b=DnOyrUwtRAwzJloHfIE5bmAiAyWXeBHZ9/k3vL9S6xEPKYSyTXIxJdo7XzKzTwln6 ma4xd7hPWcgBS72Jz2UDN0ayuGVM3OSvZIFtEGhvHO+ZvznXRZKk5J4ZzfIpKfYb6C ISH/gBZ7zPEawCQIJXr8OpfNLdzCebnhUpJG2o0Y= Date: Wed, 22 Oct 2025 11:24:05 -0700 From: Andrew Morton To: Mike Rapoport Cc: Pasha Tatashin , brauner@kernel.org, corbet@lwn.net, graf@amazon.com, jgg@ziepe.ca, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, masahiroy@kernel.org, ojeda@kernel.org, pratyush@kernel.org, rdunlap@infradead.org, tj@kernel.org, jasonmiu@google.com, dmatlack@google.com, skhawaja@google.com Subject: Re: [PATCH v3 0/3] KHO: kfence + KHO memory corruption fix Message-Id: <20251022112405.8ef617335ba0387f0608188c@linux-foundation.org> In-Reply-To: References: <20251021000852.2924827-1-pasha.tatashin@soleen.com> <20251021135331.8e0185a173a5fa40add60802@linux-foundation.org> X-Mailer: Sylpheed 3.7.0 (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: rspam04 X-Rspamd-Queue-Id: CA42B14000F X-Stat-Signature: th1rm7ykomm4z15pnmttuz44r39mt67i X-HE-Tag: 1761157447-920593 X-HE-Meta: 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 hpFhxcRp kvJ2OHARwLBL7kQbpEI7K32T1RoReRa9Wd6ySL81hRJSJjBAiZFeXuJ46reqKNUTCEWK4NzDeKb7dwWwldIDnlvtapx94Zqb0jtUPiD8aMI8fVm1uBQoiAyxD1iX+ASi980mp0RG5hH8wCLyc2+6UEaWgSq/0Y81nEKF+TFQFHS+G6bZDOPUrUFjNVPHzw0gRJHZnIPKCBaW0W1lf61eDvPKy5wiYXU3++jux3AsTu6wo7RLNdeZM0NPh7q8bjIDO2zdkwQ+ZAHCbNUa9FwDznfWdVw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, 22 Oct 2025 08:48:34 +0300 Mike Rapoport wrote: > > We are using KHO and have had obscure crashes due to this memory > > corruption, with stacks all over the place. I would prefer this fix to > > be properly backported to stable so we can also automatically consume > > it once we switch to the upstream KHO. I do not think disabling kfence > > in the Google fleet to resolve this problem would work for us, so if > > it is not going to be part of stable, we would have to backport it > > manually anyway. > > The backport to stable is only relevant to 6.17 that's going to be EOL soon > anyway. Do you really think it's worth the effort? If some organization is basing their next kernel on 6.17 then they'd like it. Do we assume that all organizations follow the LTS schedule? I haven't been doing that.