From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756915Ab2ECPzh (ORCPT ); Thu, 3 May 2012 11:55:37 -0400 Received: from mail-yx0-f174.google.com ([209.85.213.174]:36170 "EHLO mail-yx0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754842Ab2ECPzg convert rfc822-to-8bit (ORCPT ); Thu, 3 May 2012 11:55:36 -0400 MIME-Version: 1.0 In-Reply-To: <20120503154140.GA2592@linux.vnet.ibm.com> References: <20120503154140.GA2592@linux.vnet.ibm.com> From: Sasha Levin Date: Thu, 3 May 2012 17:55:14 +0200 Message-ID: Subject: Re: rcu: BUG on exit_group To: paulmck@linux.vnet.ibm.com Cc: "linux-kernel@vger.kernel.org List" Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, May 3, 2012 at 5:41 PM, Paul E. McKenney wrote: > On Thu, May 03, 2012 at 10:57:19AM +0200, Sasha Levin wrote: >> Hi Paul, >> >> I've hit a BUG similar to the schedule_tail() one when. It happened >> when I've started fuzzing exit_group() syscalls, and all of the traces >> are starting with exit_group() (there's a flood of them). >> >> I've verified that it indeed BUGs due to the rcu preempt count. > > Hello, Sasha, > > Which version of -next are you using?  I did some surgery on this > yesterday based on some bugs Hugh Dickins tracked down, so if you > are using something older, please move to the current -next. I'm using -next from today (3.4.0-rc5-next-20120503-sasha-00002-g09f55ae-dirty).