From mboxrd@z Thu Jan 1 00:00:00 1970 From: Aaro Koskinen Subject: Re: RCU bug with v3.17-rc3 ? Date: Fri, 10 Oct 2014 00:47:06 +0300 Message-ID: <20141009214706.GC4606@drone.musicnaut.iki.fi> References: <20140904191642.GJ5001@linux.vnet.ibm.com> <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> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20141009204101.GA25955@debian> Sender: linux-kernel-owner@vger.kernel.org To: Rabin Vincent Cc: Felipe Balbi , Johannes Weiner , Andrew Morton , Linus Torvalds , Sasha Levin , "Paul E. McKenney" , Linux USB Mailing List , Alan Stern , josh@joshtriplett.org, Linux Kernel Mailing List , Tony Lindgren , Linux OMAP Mailing List , Linux ARM Kernel Mailing List , Rik van Riel List-Id: linux-omap@vger.kernel.org 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). A.