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b=BvsJ03pGBLi1YmtCZ8C0D8WvcHS+RmRHNPZql7RGpbklXYte0LYpupraBCS4xOuMO 7tx5BZOJK7thCe6TZFgyOrnoF9I6bfopWVDyL/y65ALY4qy003kQfaka63vmfVR2Z/ QSY8SeskvpY9pZE3E/eEtDypZcHUmieSsMAhRtnVIItxCjfIL9qb6gKYQIYYQLGJ6N zVjxCXptAk7rZJ4GIBdloP69N1KCaa0pooMlqHjyNLSBRZPZFANqW8glt6eGdpk20c SH1aazS15ehjZq6kUZtzL0EPiK1//rZkPY9t7G2A6GPPq+s3MgrOUtVcQ9c11GmMYC PQq/bC91NY4Sw== Date: Wed, 22 Oct 2025 08:48:34 +0300 From: Mike Rapoport To: Pasha Tatashin Cc: Andrew Morton , 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: References: <20251021000852.2924827-1-pasha.tatashin@soleen.com> <20251021135331.8e0185a173a5fa40add60802@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Rspamd-Queue-Id: 72394A0008 X-Rspamd-Server: rspam11 X-Rspam-User: X-Stat-Signature: c66yhntptkzyq4pnsf8ggm7oi3r84wsf X-HE-Tag: 1761112125-111808 X-HE-Meta: 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 nvwry2oL PyU498ZTtH8zgabh+9Znx/AO2cY7MRplfdzOwDqDJXK1t52TwPXjl3Z9CxATecaXcO5nBSLq1YwP7S28h71v2i+EXcuB6wolCrTO2UAcYBzIHKjRw3ovkVOKFpdAxIxaW/04sbyT3D8qxf+HoIc7im5TiZHV6Bp25kksl+EsE5wOuVdIX8spIjvKDST99v+rjHznuo7N18Q5OBwegLA7TU8Ot57DtxR/jinm+5eQ8x1oBJ8y1ez3l9UBh6qMk1bxmH6aerughB0zTQXWNP7JFwAxwh4Kq7blDPFs/I+7VBmy2sV+cYefs5pnZMFeo17/Vu57GwID15vKbX/cXYNAuL6MMcxQ7DKD03q689Ld5b+XN89ds3jpOCdxefnJfy62zSI6tJbgef+KcQ/o= 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 Tue, Oct 21, 2025 at 08:15:04PM -0400, Pasha Tatashin wrote: > On Tue, Oct 21, 2025 at 4:53 PM Andrew Morton wrote: > > > > On Tue, 21 Oct 2025 12:04:47 -0400 Pasha Tatashin wrote: > > > > > > With liveupdate: dropped from the subjects > > > > > > I noticed "liveupdate: " subject prefix left over only after sending > > > these patches. Andrew, would you like me to resend them, or could you > > > remove the prefix from these patches? > > > > No problem. > > > > What should we do about -stable kernels? > > > > It doesn't seem worthwhile to backport a 3-patch series for a pretty > > obscure bug. Perhaps we could merge a patch which disables this > > 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? > Thanks, > Pasha > > > combination in Kconfig, as a 6.18-rcX hotfix with a cc:stable. > > > > Then for 6.19-rc1 we add this series and a fourth patch which undoes > > that Kconfig change? -- Sincerely yours, Mike.