Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757643AbYFPDGG (ORCPT ); Sun, 15 Jun 2008 23:06:06 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751056AbYFPDFz (ORCPT ); Sun, 15 Jun 2008 23:05:55 -0400 Received: from ik-out-1112.google.com ([66.249.90.176]:33374 "EHLO ik-out-1112.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750851AbYFPDFy (ORCPT ); Sun, 15 Jun 2008 23:05:54 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; b=So90LMBKMeAMS/9ssEc6SeyTHZtUMICbJeBohwAZwsgECh9eRKMuizSoCuIRjkkuI1 aVyrtFfBN/dY3z0wVoU2LX7oQgwuw74A33g49REY8qr5UHRHLQFAr1VZaZmYqhAUD+V7 aZ/Y5TXUZ129eRRSQq9bYdREvvqoFMobtQqDU= Date: Mon, 16 Jun 2008 07:01:54 +0400 From: Alexey Dobriyan To: Linus Torvalds Cc: "Paul E. McKenney" , Oleg Nesterov , Adrian Bunk , "Rafael J. Wysocki" , Linux Kernel Mailing List Subject: Re: [Bug #10815] 2.6.26-rc4: RIP find_pid_ns+0x6b/0xa0 Message-ID: <20080616030154.GA7445@martell.zuzino.mipt.ru> References: <20080614144200.GA26421@linux.vnet.ibm.com> <20080614145839.GA10523@tv-sign.ru> <20080614181212.GB26421@linux.vnet.ibm.com> <20080614194338.GA4820@martell.zuzino.mipt.ru> <20080615033001.GE26421@linux.vnet.ibm.com> <20080615162150.GA8289@martell.zuzino.mipt.ru> <20080615181710.GA17915@linux.vnet.ibm.com> <20080615232754.GD17915@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.16 (2007-06-09) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1099 Lines: 26 On Sun, Jun 15, 2008 at 04:38:24PM -0700, Linus Torvalds wrote: > On Sun, 15 Jun 2008, Paul E. McKenney wrote: > > > > If that is the right thing to do. I would feel better about it if I > > could reproduce the failure. > > Is there some configuration thing that might make it happen for Alexey but > not for you? The only obvious one is the normal PREEMPT thing, but > PREEMPT_RCU obviously depends on that, so there must be something else. > > CONFIG_SMP? CONFIG_NO_HZ? CONFIG_[RT|FAIR]_GROUP_SCHED? There's a number > of config options that change scheduling details.. The only way I can "fix" rcutorture here is SMP=n (not maxcpus=1!). Among things tried and do not matter are NO_HZ, HIGH_RES_TIMERS, turning off debugging options (one by one and in bulk), DEBUG_PER_CPU_MAPS, HZ tweaks, SCHED_MC. All of this doesn't help, but SMP=n does. -- 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/