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=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=unavailable 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 7DCCAC4360F for ; Thu, 21 Feb 2019 13:29:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 446DB2086A for ; Thu, 21 Feb 2019 13:29:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728011AbfBUN3S (ORCPT ); Thu, 21 Feb 2019 08:29:18 -0500 Received: from mx2.suse.de ([195.135.220.15]:33014 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725385AbfBUN3S (ORCPT ); Thu, 21 Feb 2019 08:29:18 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id D5B5DAF94; Thu, 21 Feb 2019 13:29:16 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id 49DCC1E0900; Thu, 21 Feb 2019 14:29:16 +0100 (CET) Date: Thu, 21 Feb 2019 14:29:16 +0100 From: Jan Kara To: Meelis Roos Cc: Jan Kara , Matthew Wilcox , "Theodore Y. Ts'o" , linux-alpha@vger.kernel.org, LKML , linux-block@vger.kernel.org, linux-mm@kvack.org Subject: Re: ext4 corruption on alpha with 4.20.0-09062-gd8372ba8ce28 Message-ID: <20190221132916.GA22886@quack2.suse.cz> References: <076b8b72-fab0-ea98-f32f-f48949585f9d@linux.ee> <20190216174536.GC23000@mit.edu> <20190218120209.GC20919@quack2.suse.cz> <4e015688-8633-d1a0-308b-ba2a78600544@linux.ee> <20190219132026.GA28293@quack2.suse.cz> <20190219144454.GB12668@bombadil.infradead.org> <20190220094813.GA27474@quack2.suse.cz> <2381c264-92f5-db43-b6a5-8e00bd881fef@linux.ee> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2381c264-92f5-db43-b6a5-8e00bd881fef@linux.ee> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu 21-02-19 01:23:50, Meelis Roos wrote: > > > First, I found out that both the problematic alphas had memory compaction and > > > page migration and bounce buffers turned on, and working alphas had them off. > > > > > > Next, turing off these options makes the problematic alphas work. > > > > OK, thanks for testing! Can you narrow down whether the problem is due to > > CONFIG_BOUNCE or CONFIG_MIGRATION + CONFIG_COMPACTION? These are two > > completely different things so knowing where to look will help. Thanks! > > Tested both. > > Just CONFIG_MIGRATION + CONFIG_COMPACTION breaks the alpha. > Just CONFIG_BOUNCE has no effect in 5 tries. OK, so page migration is problematic. Thanks for confirmation! Honza -- Jan Kara SUSE Labs, CR