From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 485F04F0545; Mon, 19 Oct 2026 12:24:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792412682; cv=none; b=cS9QKMBz9l/LxSqYKtk+rJN4CwW+VicLatk6fPMZMJW7pHbeXZ4a7dSwj7LrCCaWE/LLc0QyIrbL/jLwgbZ6Awe8mWHHT3ZbRtRBKIzo/rctavakMEwsyaveU7paCDhDXzim5E9jXOJy2Vgql5c4li7bYYKivNrR5c21SSsiESg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792412682; c=relaxed/simple; bh=depGBNWTJOth+tixF+gTVLE6p+N/VC4raERj007M5c4=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=R93s+nI0CSI/Nbs8Q1Kdqni09f2Oit24X05rjQt3Fu22rMVoZ0f8Wm9PPq02EfU0+stNAwWbOXwy97PAh8HvlX6aBCZcC13AyrXYtPxnl485pkrDhCpmvrTFF2eIIuRI/zU+KMUiLFntsP+KyQ/BsTZFJzGqp66J8ES4mSDDuIE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UIclckRe; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="UIclckRe" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 04A4C1F000C4; Mon, 19 Oct 2026 12:24:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792412677; bh=PjLOjJ0vU6EmifRuz9YgBL8J8WMfaEKUpeJsLHfNMeQ=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=UIclckReVDUKs6IGU4//3urRXgq0S9ghCmLXaRsJrj6BW+j2Qwg23bgIo9fckLFqr hxuOfaIEh9VV5IZp4JGashPMUqJqF6QAgoPBJ1EJAsjR3VamkhfW0sESBzVMbvWb3S RgHzND38ypHVJ9C1DzZdfk6bTZIAZVEvLlch1vekluuGbTgyy5kPSAwE+UdWeaeCy9 UrSFJ6pTe0eq3qTnfyUdFeA/fH7+D3eufcrORD7ftW3SFiI+WUsCFhqBpl7g9fUdR9 LQDyWJwFx5X58g8cxo3R9fkIjGZkw/A4ikJtvSBVlFqS0Z5sCnPoRSqXmvzwz32plP R9bW7waE21/tA== Message-ID: <3fcce5c1-076f-44e2-b162-9adcea52f157@kernel.org> Date: Mon, 19 Oct 2026 14:24:30 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 10/10] mm/mremap: fix calling fixup_hugetlb_reservations() on the wrong VMA To: Lance Yang Cc: akpm@linux-foundation.org, liam@infradead.org, ljs@kernel.org, vbabka@kernel.org, jannh@google.com, pfalcato@suse.de, muchun.song@linux.dev, osalvador@suse.de, linmiaohe@huawei.com, nao.horiguchi@gmail.com, agl@us.ibm.com, mel@csn.ul.ie, riel@surriel.com, peterx@redhat.com, kas@kernel.org, rppt@kernel.org, josef@toxicpanda.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org References: <20261015-urgent_fixes-v1-10-42796911043b@kernel.org> <20261018083431.15699-1-lance.yang@linux.dev> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 10/18/26 10:34, Lance Yang wrote: > > On Thu, Oct 15, 2026 at 06:07:16PM +0200, David Hildenbrand (Arm) wrote: >> In case we fail to move the page tables, for example, because we fail >> to allocate a page table, we actually keep the old VMA. >> >> Calling fixup_hugetlb_reservations() on the old VMA is wrong. Fix it >> by just calling it on the VMA that will be removed. >> >> The user-visible impact is that the VMA loses its reservations, meaning >> that the existing reservations get stranded (leaked) and new hugetlb folios >> that are getting allocated in the VMA cannot make use of the >> reservations, failing these allocations. >> >> Fixes: b714ccb02a76 ("mm/mremap: complete refactor of move_vma()") >> Cc: stable@vger.kernel.org >> Reviewed-by: Lorenzo Stoakes (ARM) >> Signed-off-by: David Hildenbrand (Arm) >> --- > > Reviewed-by: Lance Yang Thanks for all the review, Lance! -- Cheers, David