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h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=vZtU9Dt5WIVq0BK/9r6wJhbJ52OVVUzbQN24aCI1+8o4UcoYz09Gg2mVSu8du25RI NdNOI4J7J/JnyAJaYL01s5DEJNQJAEYLuOmkQHmaKMFk80eZ3IxDz3Nkqm6TjYCoXz NEHhXCwNI+hLozBES6iWNJXIJZPYzGyqpYWHNRcU= Date: Fri, 15 May 2026 11:22:02 +0200 From: Greg KH To: Ahmed Elaidy Cc: Andrei Vagin , stable@vger.kernel.org, lorenzo.stoakes@oracle.com, akpm@linux-foundation.org, linux-mm@kvack.org Subject: Re: [PATCH 6.18.y v3] mm: fix VM_SOFTDIRTY propagation on VMA merge Message-ID: <2026051531-failing-nectar-83bf@gregkh> References: <20260504195447.31794-1-elaidya225@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260504195447.31794-1-elaidya225@gmail.com> X-Stat-Signature: fyooykdcxkguzjqz197jfkfzatgxuwro X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 5B962120009 X-Rspam-User: X-HE-Tag: 1778836919-167513 X-HE-Meta: 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 dfky/8tO U4jzC83d+15MaQnE48gvCffMq+XS6bVXe1SMCmRY4S8fPENkHUIWAW3BzkseJIh6hB5y9d7HsmdOFOVt23MoHeH3vmpxSDkLWQwfXio5VtTIx8GU4bAQvkgqrs/fRpYRvzvJPouRIcz0BKjnll3yp7JaHyNcHPA/qu/0gqYAMvQtWp4HjZWDKUuf9rLm0goegw4uKWkZFKp+d73mc9z2il2lpH2moAHrhtP8thSC2XPNzaLg1yIcz1j6iKTOdnFDmYuF7bl6zLqATYw/TmrW1J+2m7NMCFtuW3cGCBhbufyHQDzltwyhpb1M11kaoRCAU933slj59JFgtOck2vJkssOgp+SZVHAucW+pkcx0XDL85+lg= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, May 04, 2026 at 10:54:47PM +0300, Ahmed Elaidy wrote: > During VMA merging, such as through mprotect(), VM_SOFTDIRTY flags could be > lost. This breaks tools relying on soft-dirty tracking, such as CRIU > incremental dump/restore. > > Upstream resolved this using a broader VM_STICKY infrastructure (commit > bf14d4a05387 "mm: propagate VM_SOFTDIRTY on merge"). To minimize churn and > risk in the stable 6.18.y tree, this patch skips backporting the entire > VM_STICKY series (9 patches). Instead, it introduces a minimal standalone fix. 9 patches is nothing. Please just backport the whole thing, especially as we will be maintaining this kernel for a long time. We want what is upstream for future issues/fixes, right? thanks, greg k-h