From: Aaro Koskinen Subject: Re: ARM kernel (& ext3) stability issues with GCC 4.8? Date: Tue, 21 Jan 2014 21:58:41 +0200 Message-ID: <20140121195841.GA23238@drone.musicnaut.iki.fi> References: <20130613220429.GC18360@blackmetal.musicnaut.iki.fi> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii To: linux-arm-kernel@lists.infradead.org, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org Return-path: Content-Disposition: inline In-Reply-To: <20130613220429.GC18360@blackmetal.musicnaut.iki.fi> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org Hi, On Fri, Jun 14, 2013 at 01:04:29AM +0300, Aaro Koskinen wrote: > I'm having severe stability issues with 3.10-rc5 on OpenRD (kirkwood) > when cross-compiling it using GCC 4.8.1 (I tried also GCC 4.8.0 > with 3.9-something earlier with pretty much same results). [...] > [ 3383.627778] ------------[ cut here ]------------ > [ 3383.654029] kernel BUG at fs/buffer.c:2956! It looks like the issue was caused by GCC bug 58854 (http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58854). The bug is still present in GCC 4.8.2 but there's a fix available in GCC repository. The bug resulted in at least fs/buffer.c getting compiled incorrectly, and what we saw were kernel crashes or file system getting corrupted or both. A.