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[195.135.220.15]) by mx.google.com with ESMTPS id z11si730139edx.149.2019.02.21.05.29.17 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 21 Feb 2019 05:29:17 -0800 (PST) Received-SPF: pass (google.com: domain of jack@suse.cz designates 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=pass (google.com: domain of jack@suse.cz designates 195.135.220.15 as permitted sender) smtp.mailfrom=jack@suse.cz 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) 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 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