Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752132AbaKGL4w (ORCPT ); Fri, 7 Nov 2014 06:56:52 -0500 Received: from mail-wi0-f179.google.com ([209.85.212.179]:47958 "EHLO mail-wi0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751435AbaKGL4s (ORCPT ); Fri, 7 Nov 2014 06:56:48 -0500 Message-ID: <545CB37C.6080804@message-id.googlemail.com> Date: Fri, 07 Nov 2014 12:56:44 +0100 From: Stefan Seyfried User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 MIME-Version: 1.0 To: Paul Bolle CC: LKML Subject: Re: [REGRESSION] in 3.18-rc1: ppp crashes kernel References: <545CA8B6.2060608@message-id.googlemail.com> <1415361193.4390.46.camel@x220> In-Reply-To: <1415361193.4390.46.camel@x220> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Paul, Am 07.11.2014 um 12:53 schrieb Paul Bolle: > On Fri, 2014-11-07 at 12:10 +0100, Stefan Seyfried wrote: >> I bisected the issue multiple times and always arrived at >> >> # first bad commit: [d6dd50e07c5bec00db2005969b1a01f8ca3d25ef] Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip >> >> which is a merge commit unfortunately. > > That merge commit actually does add some code: > > git show d6dd50e07c5bec00db2005969b1a01f8ca3d25ef > [...] > diff --cc init/main.c > index 8af2f1abfe38,e3c4cdd94d5b..c5c11da6c4e1 > --- a/init/main.c > +++ b/init/main.c > @@@ -583,6 -585,6 +583,7 @@@ asmlinkage __visible void __init start_ > early_irq_init(); > init_IRQ(); > tick_init(); > ++ rcu_init_nohz(); > init_timers(); > hrtimers_init(); > softirq_init(); > > Wild guess: is CONFIG_RCU_NOCB_CPU perhaps set in your > v3.18-rc3 .config? Yes it is: tux@linux:~> zgrep CONFIG_RCU_NOCB_CPU /proc/config.gz CONFIG_RCU_NOCB_CPU=y # CONFIG_RCU_NOCB_CPU_NONE is not set # CONFIG_RCU_NOCB_CPU_ZERO is not set CONFIG_RCU_NOCB_CPU_ALL=y And I'll try without it, but looking at the backtrace and the actual BUG_ON() in the code, I cannot really believe it is the real problems. But I'll try with the config changed and with the above line removed. Thanks, Stefan -- Stefan Seyfried Linux Consultant & Developer -- GPG Key: 0x731B665B B1 Systems GmbH Osterfeldstraße 7 / 85088 Vohburg / http://www.b1-systems.de GF: Ralph Dehner / Unternehmenssitz: Vohburg / AG: Ingolstadt,HRB 3537 -- 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/