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b=kDJe5+sso7hd35pmgzbRec8EJdYFSAwXcWDHIULo7DbPrsDAl6hsi5m0Tws7hwLeq nWZpRus0U9ISk9umHlTdCNb+ibfhrhUAoXMAlFkw6TeLMgFmhxcv+LAspg3ZcUFjN8 FZsCkn35Rt0VEoc00wFmuhNtBeWH4h2CjnsZ+tukSsz5wrgZ4CntgmHLEqsJCEwGgz qHApvhZmrQ5QX/FiKlCSUyuA6kMPIFs9pE9dHXdTR6qDLdaoDPIqkuc0ZT13XVeEOP yb6hTSsP+gEYH+VGqakcdb0IiJIbaGhnKtyUVGHiBv2xYKeDHScSELnkDzyD6ifWD/ OR01yP1WM1yIA== Date: Fri, 15 May 2026 12:52:17 +0100 From: Lorenzo Stoakes To: Greg KH Cc: Ahmed Elaidy , Andrei Vagin , stable@vger.kernel.org, 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: References: <20260504195447.31794-1-elaidya225@gmail.com> <2026051531-failing-nectar-83bf@gregkh> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2026051531-failing-nectar-83bf@gregkh> X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 390EC18000D X-Stat-Signature: rxh18xpzxnd1794fgkz9qgi95j3udyos X-Rspam-User: X-HE-Tag: 1778845941-118692 X-HE-Meta: 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 QwNgF+Ai 71dEXZVdn7vsjT/vFQjFUppukZgDfH65Q1AQB3RTPlDuZVYO1LDj3KOF6D/Tb35fyymMhmaztGF8vsmyMax7EaXfuVBWdd24OIQ00c3pEyTC1chBDew6KVZfFE604Nr9UH2KvHHVyaNoGqDNMyI+fDdGbFDyWrix1mi8D9tdAB/v08wja0QK1CMVd0exf0fzHdpZb+c8Fy4Gvqsjh12K0xPptD4zuAqbOmaekvV7aln34PshQd+nZfj49aRM7mM0rVwY6xgXXzR+FeDsNqgpE4FLqyBhRtFqlMUAFKstDvPr8trY= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, May 15, 2026 at 11:22:02AM +0200, Greg KH wrote: > 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? FWIW, agreed! > > thanks, > > greg k-h Cheers, Lorenzo