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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 74909C43603 for ; Tue, 10 Dec 2019 02:01:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 55D3020637 for ; Tue, 10 Dec 2019 02:01:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726642AbfLJCBl (ORCPT ); Mon, 9 Dec 2019 21:01:41 -0500 Received: from outgoing-auth-1.mit.edu ([18.9.28.11]:56186 "EHLO outgoing.mit.edu" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726605AbfLJCBl (ORCPT ); Mon, 9 Dec 2019 21:01:41 -0500 Received: from callcc.thunk.org (guestnat-104-132-34-105.corp.google.com [104.132.34.105] (may be forged)) (authenticated bits=0) (User authenticated as tytso@ATHENA.MIT.EDU) by outgoing.mit.edu (8.14.7/8.12.4) with ESMTP id xBA21Ukk012184 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 9 Dec 2019 21:01:32 -0500 Received: by callcc.thunk.org (Postfix, from userid 15806) id 9468A421A48; Mon, 9 Dec 2019 21:01:30 -0500 (EST) Date: Mon, 9 Dec 2019 21:01:30 -0500 From: "Theodore Y. Ts'o" To: Rafael David Tinoco Cc: ebiggers3@gmail.com, adilger.kernel@dilger.ca, bot+eb13811afcefe99cfe45081054e7883f569f949d@syzkaller.appspotmail.com, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: ppc64el kernel access of bad area (ext4_htree_store_dirent->rb_insert_color) Message-ID: <20191210020130.GA61323@mit.edu> References: <20171219215906.GA12465@gmail.com> <20191209132914.907306-1-rafaeldtinoco@ubuntu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191209132914.907306-1-rafaeldtinoco@ubuntu.com> User-Agent: Mutt/1.12.2 (2019-09-21) Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org On Mon, Dec 09, 2019 at 10:29:14AM -0300, Rafael David Tinoco wrote: > It looks like the same stacktrace that was reported in this thread. This has > been reported to ppc64el AND we got a reproducer (ocfs2-tools autopkgtests). Can you share your reproducer? Is it a super-simple reproducer that doesn't require a complex setup and which can be triggered in some kind of virtual machine (under KVM, etc.)? > Thread from beginning 2018, so I guess this issue is pretty intermittent but > might exist, and, perhaps, its related to specific arches/machines ? What syzbot reported (a) had no reproducer, (b) only reproduced twice on linux-next in 2017, and never since. So if you're seeing something in 2019 in ppc64el, it may not be the same issue. - Ted