From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f70.google.com (mail-wm0-f70.google.com [74.125.82.70]) by kanga.kvack.org (Postfix) with ESMTP id 299326B0038 for ; Wed, 5 Oct 2016 02:20:56 -0400 (EDT) Received: by mail-wm0-f70.google.com with SMTP id l138so146655396wmg.3 for ; Tue, 04 Oct 2016 23:20:56 -0700 (PDT) Received: from mx2.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id c184si29960065wmd.123.2016.10.04.23.20.54 for (version=TLS1 cipher=AES128-SHA bits=128/128); Tue, 04 Oct 2016 23:20:54 -0700 (PDT) Date: Wed, 5 Oct 2016 08:20:53 +0200 From: Jan Kara Subject: Re: Frequent ext4 oopses with 4.4.0 on Intel NUC6i3SYB Message-ID: <20161005062053.GD20752@quack2.suse.cz> References: <20161004084136.GD17515@quack2.suse.cz> <90dfe18f-9fe7-819d-c410-cdd160644ab7@gmx.de> <2b7d6bd6-7d16-3c60-1b84-a172ba378402@gmx.de> <087b53e5-b23b-d3c2-6b8e-980bdcbf75c1@gmx.de> <26892620-eac1-eed4-da46-da9f183d52b1@gmx.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <26892620-eac1-eed4-da46-da9f183d52b1@gmx.de> Sender: owner-linux-mm@kvack.org List-ID: To: Johannes Bauer Cc: Andrey Korolyov , Jan Kara , linux-ext4@vger.kernel.org, linux-mm@kvack.org On Tue 04-10-16 23:54:24, Johannes Bauer wrote: > > - disk accesses and corresponding power spikes are causing partial > > undervoltage condition somewhere where bits are relatively freely > > flipping on paths without parity checking, though this could be > > addressed only to an onboard power distributor, not to power source > > itself. > > Huh that sounds like "defective hardware" to me, wouldn't it? Yeah, from the frequency and the kind of failures, I actually don't think it's a kernel bug anymore. So I'd also suspect something like that bits on memory bus start to flip when the disk is loaded or something like that. If you say compilation on tmpfs is fine - can you try compiling kernel in tmpfs in a loop and then after it is running smoothly for a while start to load the disk by copying a lot of data there? Do the errors trigger? Honza -- Jan Kara SUSE Labs, CR -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org