Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754010AbaJJQTI (ORCPT ); Fri, 10 Oct 2014 12:19:08 -0400 Received: from gw-1.arm.linux.org.uk ([78.32.30.217]:60046 "EHLO pandora.arm.linux.org.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752035AbaJJQTE (ORCPT ); Fri, 10 Oct 2014 12:19:04 -0400 Date: Fri, 10 Oct 2014 17:18:35 +0100 From: Russell King - ARM Linux To: Aaro Koskinen Cc: Rabin Vincent , Rik van Riel , Linux OMAP Mailing List , Tony Lindgren , Linux USB Mailing List , josh@joshtriplett.org, Felipe Balbi , Linux Kernel Mailing List , Alan Stern , Johannes Weiner , Sasha Levin , Andrew Morton , "Paul E. McKenney" , Linus Torvalds , Linux ARM Kernel Mailing List Subject: Re: RCU bug with v3.17-rc3 ? Message-ID: <20141010161835.GK12379@n2100.arm.linux.org.uk> References: <20140904192535.GJ13421@saruman.home> <20140904200403.GL13421@saruman.home> <20140905213216.GD5001@linux.vnet.ibm.com> <20141008171322.GH22688@saruman> <20141008175707.GI22688@saruman> <20141008212938.GP22688@saruman> <20141009160138.GA2396@cmpxchg.org> <20141009162656.GE16002@saruman> <20141009204101.GA25955@debian> <20141009214706.GC4606@drone.musicnaut.iki.fi> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20141009214706.GC4606@drone.musicnaut.iki.fi> User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Oct 10, 2014 at 12:47:06AM +0300, Aaro Koskinen wrote: > Hi, > > On Thu, Oct 09, 2014 at 10:41:01PM +0200, Rabin Vincent wrote: > > What GCC version are you using? > > > > 4.8.1 and 4.8.2 are known to miscompile the ARM kernel and these > > find_get_entry() crashes with 0xffffffff involved smell a lot like the > > earlier reports from kernels build with those compilers: > > > > https://lkml.org/lkml/2014/6/25/456 > > https://lkml.org/lkml/2014/6/30/375 > > https://lkml.org/lkml/2014/6/30/660 > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58854 > > https://lkml.org/lkml/2014/5/9/330 > > Is it possible to blacklist those GCC versions on ARM somehow as it > seems people are still using them? > > This bug also ruined a file system on one of my boxes last year > (see e.g. http://marc.info/?l=linux-arm-kernel&m=139033442527244&w=2). Given that, why the fsck (pun intended) did you not shout a little louder about getting it blacklisted. Looking at your marc.info URL, there's very little information there which hints at filesystem corruption, and it's a thread of only *one* message according to marc.info. Even _if_ I did read the message you point to above, that on its own did not hint at filesystem corruption. So, would you please mind passing on further details about this, specifically which function in the ext4 code is affected, so it can be properly written up. Thanks. -- FTTC broadband for 0.8mile line: currently at 9.5Mbps down 400kbps up according to speedtest.net. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/