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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 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 C7A24C432C0 for ; Tue, 19 Nov 2019 04:06:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 98985222A4 for ; Tue, 19 Nov 2019 04:06:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574136393; bh=h3O05lBsTS2ujFG2b7XJbkSMdiqsVY8miz0OJT9ljAY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=UIjkK/hVTQjngfP0fTFBGmUWO7mstMk9yQWXLX7z6ju1U0z4F4lX/BL2PV/6iiqbm Ifu2A0A5D3+6HIZuibaesYASTRZxmMEl7kPR0Uf1V2XhZlbqkRvQDzpQH2VpmaSsZo VhPXTT+RSu1/yoCGB0RiI2rhvJcl0MZQek57zvBA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727645AbfKSEGc (ORCPT ); Mon, 18 Nov 2019 23:06:32 -0500 Received: from mail.kernel.org ([198.145.29.99]:34030 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727586AbfKSEGc (ORCPT ); Mon, 18 Nov 2019 23:06:32 -0500 Received: from sol.localdomain (c-24-5-143-220.hsd1.ca.comcast.net [24.5.143.220]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 26BC522316; Tue, 19 Nov 2019 04:06:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574136391; bh=h3O05lBsTS2ujFG2b7XJbkSMdiqsVY8miz0OJT9ljAY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=b+wRyXD2zkHzq/hfU2wpIHEKPrRjEnfGHdPYpW6XIAGvEiJnMIO1aOU38pEBXDBJf 3dZtX+Fxj4RlMNrhWsb05DRyCbiqi9cngiD2oWhJz18y/EVOPgYUjdzC5iFJaYuj3/ VnSB9m7TpKXSzZSzP1klBNd6sjyAafs5+BJnsBKw= Date: Mon, 18 Nov 2019 20:06:29 -0800 From: Eric Biggers To: syzbot Cc: Steven Price , linux-mm@kvack.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: general protection fault in pagemap_pmd_range Message-ID: <20191119040629.GA163020@sol.localdomain> References: <000000000000ca5b3f0596a21e0c@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <000000000000ca5b3f0596a21e0c@google.com> User-Agent: Mutt/1.12.2 (2019-09-21) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [trimmed down ridiculous Cc list] On Tue, Nov 05, 2019 at 03:52:08PM -0800, syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 51309b9d Add linux-next specific files for 20191105 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=11ad1658e00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=a9b1a641c1f1fc52 > dashboard link: https://syzkaller.appspot.com/bug?extid=a0fc447639c6ffa66b59 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=164e5f92e00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15c65bcce00000 > > The bug was bisected to: > > commit 181be542ef3c9ca495500143d4c23f4d58beb5ab > Author: Steven Price > Date: Mon Nov 4 22:57:54 2019 +0000 > > mm: pagewalk: allow walking without vma > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11341968e00000 > final crash: https://syzkaller.appspot.com/x/report.txt?x=13341968e00000 > console output: https://syzkaller.appspot.com/x/log.txt?x=15341968e00000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+a0fc447639c6ffa66b59@syzkaller.appspotmail.com > Fixes: 181be542ef3c ("mm: pagewalk: allow walking without vma") > > kasan: CONFIG_KASAN_INLINE enabled > kasan: GPF could be caused by NULL-ptr deref or user memory access > general protection fault: 0000 [#1] PREEMPT SMP KASAN > CPU: 0 PID: 8839 Comm: syz-executor009 Not tainted 5.4.0-rc6-next-20191105 > #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:pmd_trans_huge_lock include/linux/huge_mm.h:219 [inline] > RIP: 0010:pagemap_pmd_range+0x83/0x1e40 fs/proc/task_mmu.c:1373 >From some quick tests, this seems to have been fixed by mm-pagewalk-allow-walking-without-vma-v15 (http://lkml.kernel.org/r/20191101140942.51554-13-steven.price@arm.com). And it's consistent with syzbot last seeing this crash on next-20191105. As this fix will be folded in, let's invalidate this syzbot bug report: #syz invalid