From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261551AbVGRL23 (ORCPT ); Mon, 18 Jul 2005 07:28:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261655AbVGRL2U (ORCPT ); Mon, 18 Jul 2005 07:28:20 -0400 Received: from village.ehouse.ru ([193.111.92.18]:14600 "EHLO mail.ehouse.ru") by vger.kernel.org with ESMTP id S261551AbVGRL1m (ORCPT ); Mon, 18 Jul 2005 07:27:42 -0400 From: "Alexander Y. Fomichev" Reply-To: "Alexander Y. Fomichev" To: Linus Torvalds Subject: Re: 2.6.12 hangs on boot Date: Mon, 18 Jul 2005 15:27:16 +0400 User-Agent: KMail/1.8.1 Cc: Kernel Mailing List , admin@list.net.ru, Git Mailing List , ak@suse.de References: <200506221813.50385.gluk@php4.ru> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200507181527.16652.gluk@php4.ru> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Saturday 25 June 2005 02:20, Linus Torvalds wrote: > On Wed, 22 Jun 2005, Alexander Y. Fomichev wrote: > > I've been trying to switch from 2.6.12-rc3 to 2.6.12 on Dual EM64T 2.8 > > GHz [ MoBo: Intel E7520, intel 82801 ] > > but kernel hangs on boot right after records: > > > > Booting processor 2/1 rip 6000 rsp ffff8100023dbf58 > > Initializing CPU#2 > > Hmm.. Since you seem to be a git user, maybe you could try the git > "bisect" thing to help narrow down exactly where this happened (and help > test that thing too ;). [skiped] Ok, as i can see [and as Andi guessed http://bugme.osdl.org/show_bug.cgi?id=4792] issue have been introduced by new TSC sync algorithm git id: dda50e716dc9451f40eebfb2902c260e4f62cf34. And, yes, seems like it depends of timings... In my case kludge with insertion of low delay (e.g. printk) between cpu_set/mb and tsc_sync_wait() makes kernel bootable. diff -urN b/arch/x86_64/kernel/smpboot.c a/arch/x86_64/kernel/smpboot.c --- b/arch/x86_64/kernel/smpboot.c 2005-07-17 21:55:55.000000000 +0400 +++ a/arch/x86_64/kernel/smpboot.c 2005-07-17 21:57:56.000000000 +0400 @@ -451,6 +451,7 @@ cpu_set(smp_processor_id(), cpu_online_map); mb(); + printk(KERN_INFO "We're still here!\n"); /* Wait for TSC sync to not schedule things before. We still process interrupts, which could see an inconsistent time in that window unfortunately. */ -- Best regards. Alexander Y. Fomichev Public PGP key: http://sysadminday.org.ru/gluk.asc