From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793803583; b=4/8cno6qunt6AoxqID7U8M8qpc7762hkKgvPxtY0mLs9mv74O7DFo/TzvMK1TEpNhnC8 07JEvmuyhXIekQ5cRPOoISPmvHn8BB+xab49MBLCbI7dCM3LsXolcXpCGAsAvR4N1uiTv k1ebLpZj9DHjaISERENuegq+ssNB09q9YtuwJ6oKr8TFeAIAen5xDxHMie6igUsf6+Y+n JC+7WsvnDZri8dxng9iXLjapmubexT9SUskHbUmat49+Hfyt5iYhvnKz7pbyYEA73b9tm /hrIS47QpKqArYCuHJXk6NmC6gGqqTXegA5DHJ9b0NJjyNXodfFbvDyx3S/epaT2Fog== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793803583; h=Received:DKIM-Signature:Date:From:To:Cc:Subject:Message-ID: References:MIME-Version:Content-Type:Content-Disposition:In-Reply-To; bh=XvwysgLfyIs5+DpWw1HKgaTFW31+lgpV5TFO7hfqvV4=; b=HZ0uPoNtA8BKDpQQZbtIYGP8ry1PvX96NUHD1rNHK6DI0fHpUu60EXG2Yjjj2LOqlW6c Q0AT6hajDE/zJYsJfywg8VIh1Z5JEUY+KqKYlal/cmmlUinyxg1GANK28JrbqEoBxBG7e ASAEd6tpm86PKNBjpHhb5QYlOAvrpm2U9JHZ4QPbSNm+X1CYNfTXZHB38nkaZ/3cqkuoQ uRHHGrJEI1A0CyEgIckdSyTuCjTK5l5/qJzA8+IHdcfYKJvg6vbuS0AX0LpU55WkwGz1w CgOXx9uApXiYeceZ0+w+mrcV8Q95xp9n3TI0+acJ9c8geCQ+2C+eKc9tRk2X5k+dG8g== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=GMZW0dBR; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2960D606A326 for ; Wed, 4 Nov 2026 14:46:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=GMZW0dBR Received: by smtp.kernel.org (Postfix) with ESMTPSA id E02FB1F000C1; Wed, 4 Nov 2026 14:46:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793803583; bh=XvwysgLfyIs5+DpWw1HKgaTFW31+lgpV5TFO7hfqvV4=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=GMZW0dBRIx8mvbM2KDH5Mq/dO3W2/K2tCDu3B35/dJTuD9Z5x/7s8I3oCZQnzZz9l FhYKV8usOtxuEBFqs40vBPLEHiOPRUebcoIvqC3AbzVEC5tDV9avRLG4Mj/ddAc2fk CQzZHnMsyuJOgDBfxWUgB+Ia3D4sFJD5rmGSkFkZJGzyCKP+AuHyP+NuD5TgLLopen pnIYiBAUIsXgMOvrdcqKgb4OliCnCgRK4B2EpUpMPeV6VEwY+ASmgiunVXcDk9EYW7 Jtg2C8BK1OgAntrhhbw24OjOmRpacmQBVd78pWRcxIyahSg4q9Lz9fpbc3emUnlPM1 /+AgkxC2K+gcQ== Date: Wed, 4 Nov 2026 14:46:17 +0000 From: "Lorenzo Stoakes (ARM)" To: Josef Bacik Cc: Andrew Morton , "Liam R. Howlett" , David Hildenbrand , Vlastimil Babka , Jann Horn , Pedro Falcato , Muchun Song , Oscar Salvador , "Jose A. Perez de Azpillaga" , linux-mm@kvack.org, stable@vger.kernel.org Subject: Re: [PATCH v2 0/5] mm/mremap: fix accounting on a partial move Message-ID: References: <20261102-b4-mremap-pre-split-v2-0-d281dd11ad7d@toxicpanda.com> <20261102162304.c3585fc3fb88644118c152d7@linux-foundation.org> X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Wed, Nov 04, 2026 at 02:32:35PM +0000, Josef Bacik wrote: > The Committed_AS bugs need an allocation to fail during the unmap at the > end of the move. mremap() checks the map count and sealing before it > gets there, so what's left is small GFP_KERNEL allocations, which in > practice means a process that is already being OOM killed. I only hit > it with fault injection, so I left those with just Fixes and let the > stable folks decide. If you want them cc'ed it's no problem to add. Generally would prefer the fault-injection ones _not_ to be backported, they're essentially technical fixes since to actually hit them <4 KiB allocs would have to fail meaning OOM + fatal signal -> process dying soon anyway so doesn't matter. -- Cheers, Lorenzo