From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9C287C56201 for ; Tue, 24 Nov 2020 04:14:28 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id F19132085B for ; Tue, 24 Nov 2020 04:14:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="BLh3OA8M" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F19132085B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 1191A6B005D; Mon, 23 Nov 2020 23:14:26 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 0A35F6B006E; Mon, 23 Nov 2020 23:14:26 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EABE46B0070; Mon, 23 Nov 2020 23:14:25 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0149.hostedemail.com [216.40.44.149]) by kanga.kvack.org (Postfix) with ESMTP id B6A176B005D for ; Mon, 23 Nov 2020 23:14:25 -0500 (EST) Received: from smtpin30.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 5BDF1181AEF1E for ; Tue, 24 Nov 2020 04:14:25 +0000 (UTC) X-FDA: 77517994890.30.alley80_0200c682736b Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin30.hostedemail.com (Postfix) with ESMTP id 3C193180B3AA7 for ; Tue, 24 Nov 2020 04:14:25 +0000 (UTC) X-HE-Tag: alley80_0200c682736b X-Filterd-Recvd-Size: 2227 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf48.hostedemail.com (Postfix) with ESMTP for ; Tue, 24 Nov 2020 04:14:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=mlMktLVfsrdjf/T64LkGt1vFmYlTMbYcYYynjTprjGg=; b=BLh3OA8MiW6zkUwz+TIcgFV6P2 O9jjur8ymrJWnNUBlW9hJRl3DbQK+1nW01rnwzHiiiv3TmqqUJP2/FN6JtCNPn+IA4JESNQ8V6cRm 54F+8q7BDJ4NQSDPTKcHgAAC4cyzVV/xjLed+h3pIpWptKC5j4Je7hR9gvNwy9kOsH8SyWO+fyGGU ZjlhG79fbCSTehFHs24lvX5LnWd2N6dsjN67btTTvPtRVjyLS4jAG3aQerUcTsTTJEdypnwzi3ec2 E6ZVbyb/WKOrk5d1l8jDXJ0Bxbs6tHhOw12SlRl8UD/0XWKRO49Du1IIOxoZlScLW9Yd1+L1fG9Nz 0MzZoMWQ==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1khPib-0007UO-RQ; Tue, 24 Nov 2020 04:14:17 +0000 Date: Tue, 24 Nov 2020 04:14:17 +0000 From: Matthew Wilcox To: Andrew Morton Cc: syzbot , linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, Thomas Gleixner Subject: Re: kernel BUG at include/linux/highmem.h:LINE! Message-ID: <20201124041417.GX4327@casper.infradead.org> References: <000000000000f6914405b49d9c9d@google.com> <20201123194230.f59c93eba3cf356c632eb1c0@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201123194230.f59c93eba3cf356c632eb1c0@linux-foundation.org> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Nov 23, 2020 at 07:42:30PM -0800, Andrew Morton wrote: > Matthew's series "Overhaul multi-page lookups for THP" chnages the > shmem code quite a bit, and in the area of truncate. Matthew, could > you please fire up that reproducer? Almost certainly my fault. I was trying to get the shmem truncate code in better shape before posting my series of fixes. I'll send you a batch of four which fix problems noticed by Hugh. There's at least one more to come.