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=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED 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 05774CA9EA0 for ; Fri, 25 Oct 2019 21:36:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BA9A121D7B for ; Fri, 25 Oct 2019 21:36:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572039385; bh=E4lkMbIFGs07dUtv9M8GhB45SbnpOSz4PqDKVYnEmSY=; h=Date:From:To:Cc:Subject:In-Reply-To:References:List-ID:From; b=vBJUEAoWuMPiode6qzJXvd4uIf/ybBb6eZRjJSDSxHbrsdpm6RTxld5VLgLQy8E3D 8WBxcRS8Ev4BTu83vxcr712Njuo+U8XBr0pICSuuiAnKwGFBfgCIAAofAFNeoAvJW8 EP4JZdql0D67yJBsXKxw/+cLwUypaUOOr/oaL6qs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726279AbfJYVgY (ORCPT ); Fri, 25 Oct 2019 17:36:24 -0400 Received: from mail.kernel.org ([198.145.29.99]:33026 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726063AbfJYVgY (ORCPT ); Fri, 25 Oct 2019 17:36:24 -0400 Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (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 79B822084C; Fri, 25 Oct 2019 21:36:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572039383; bh=E4lkMbIFGs07dUtv9M8GhB45SbnpOSz4PqDKVYnEmSY=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=WkYKSdhn0xFzEDFlOydOOV1zjOfxSkShdjsy68pkL+Cy8u8ahbyhN43S5fq9LVYy3 feJFnbkgxiKPfiIWKTyKnixaTs9DUh9qtfn2ZOTmu6xfTHuQbiYU6a1txZc6Pv3q9n 68z6KuoS68mBmUx4XXPvoIuKE/hZxD+h2zvWGehI= Date: Fri, 25 Oct 2019 14:36:23 -0700 From: Andrew Morton To: syzbot Cc: hughd@google.com, jglisse@redhat.com, kirill.shutemov@linux.intel.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, songliubraving@fb.com, syzkaller-bugs@googlegroups.com, willy@infradead.org Subject: Re: WARNING in collapse_file Message-Id: <20191025143623.3e9b0a916635a45865a11ed3@linux-foundation.org> In-Reply-To: <00000000000066214a0595b7ea86@google.com> References: <00000000000066214a0595b7ea86@google.com> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 25 Oct 2019 01:27:07 -0700 syzbot wrote: > syzbot found the following crash on: > > HEAD commit: a6fcdcd9 Add linux-next specific files for 20191021 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=11145ed8e00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=32434321999f01e9 > dashboard link: https://syzkaller.appspot.com/bug?extid=742a9c5d4ab05d343c49 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > > Unfortunately, I don't have any reproducer for this crash yet. > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+742a9c5d4ab05d343c49@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 1080 at mm/khugepaged.c:1643 Yup, thanks, this was addressed in v4: https://ozlabs.org/~akpm/mmotm/broken-out/mmthp-recheck-each-page-before-collapsing-file-thp-v4.patch