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b=r7LHLzbd0Mx3R5rOXvWP+PpUysVwGELhq01tND4SbqiwRuh/Mcy1MSIKsa7U7icZS UUFaeKBMV0dkcXN8kqoIr3ZGSP8zIrdffHc0AXlo67wZ3OYRQm30Cpvlh5iUHBMuzz hrr4PrWEKFpePZ2nISNQaVbut+HzuB+G2w1VIGOM= Date: Tue, 15 Sep 2026 15:35:42 -0700 From: Andrew Morton To: Dima Koziuk Cc: Alexander Potapenko , Marco Elver , Dmitry Vyukov , kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/2] mm: kmsan: fix iounmap metadata teardown Message-Id: <20260915153542.3b9afbd00f7e6cea87a3350b@linux-foundation.org> In-Reply-To: <20260915160207.2952-1-dmytrokoziuk68@gmail.com> References: <20260915160207.2952-1-dmytrokoziuk68@gmail.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-Rspamd-Server: rspam04 X-Rspam-User: X-Stat-Signature: 7xiye6nfcy7trckhx1h9jz7n65bc8nyo X-Rspamd-Queue-Id: 7F9ECC0002 X-HE-Tag: 1789511744-832973 X-HE-Meta: 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 MMptXFDC joBQQDI4/6HmOdA6+dQw4Lf8BI7EbIunjM/U0wP56FU22XGPnjewn38UEhBGC2BDsZdWVmVQL1LXn6u/VdPifshMkAMbD9lyP6GXTdRJjqlA9pimayAvLJDFxntq25NMGfKy14918SD8tPAv44ynmRKHESUKKu1XQtj2kbUvciNQHWCx5Tx07oBmUkaNNszhbGagtBOWdB6ptIMFhbSUJKpdWpC6rWQ0+3LUKVtMAu2E1fUX8oSqsDWFPVVZ6HkU2shrTQoYO/u/9+jtDnrwpmJ2bU+B5dUH/yi43cQjmENtZhgleJohT2d+D5Hh6Uzqhb4rWcj1PzMjXnpk= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, 15 Sep 2026 19:02:06 +0300 Dima Koziuk wrote: > While studying the code, I noticed that kmsan_iounmap_page_range() calls > __vunmap_range_noflush(v_shadow, vmalloc_shadow(end)) inside its per-page > loop, and does the same for origin. The first iteration therefore unmaps > the entire metadata range, removing the PTEs for later pages before the > loop can recover their backing pages. Thanks. AI review might have a found a couple of issues - please check? https://sashiko.dev/#/patchset/20260915160207.2952-1-dmytrokoziuk68@gmail.com