Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757493Ab1D3QuZ (ORCPT ); Sat, 30 Apr 2011 12:50:25 -0400 Received: from 1wt.eu ([62.212.114.60]:35898 "EHLO 1wt.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751039Ab1D3QuY (ORCPT ); Sat, 30 Apr 2011 12:50:24 -0400 Date: Sat, 30 Apr 2011 18:49:58 +0200 From: Willy Tarreau To: Randy Dunlap Cc: Greg KH , Nikola Ciprich , seto.hidetoshi@jp.fujitsu.com, =?iso-8859-1?Q?Herv=E9?= Commowick , linux-kernel mlist , linux-stable mlist Subject: Re: [stable] 2.6.32.21 - uptime related crashes? Message-ID: <20110430164958.GE10529@1wt.eu> References: <20110428082625.GA23293@pcnci.linuxbox.cz> <20110428183434.GG30645@1wt.eu> <20110429100200.GB23293@pcnci.linuxbox.cz> <20110430093605.GA10529@1wt.eu> <20110430120205.GA2459@nik-comp.lan> <20110430155707.GA22021@kroah.com> <20110430090805.354484ad.rdunlap@xenotime.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20110430090805.354484ad.rdunlap@xenotime.net> User-Agent: Mutt/1.4.2.3i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1432 Lines: 42 On Sat, Apr 30, 2011 at 09:08:05AM -0700, Randy Dunlap wrote: > On Sat, 30 Apr 2011 08:57:07 -0700 Greg KH wrote: > > > On Sat, Apr 30, 2011 at 02:02:05PM +0200, Nikola Ciprich wrote: > > > > There was a kernel parameter in the past that was used to make jiffies wrap > > > > a few minutes after boot, maybe we should revive it to try to reproduce > > > > without waiting 7 new months :-/ > > > hmm, I've googled this up, and it seems to have been 2.5.x patch, so it will > > > certainly need some porting.. > > > I'll try to have a look on it tonight and report... > > > > I don't think any patch is needed, I thought we did that by default now, > > but I can't seem to find the code where it happens... > > > > odd. > > linux/jiffies.h: > > /* > * Have the 32 bit jiffies value wrap 5 minutes after boot > * so jiffies wrap bugs show up earlier. > */ > #define INITIAL_JIFFIES ((unsigned long)(unsigned int) (-300*HZ)) > > > and kernel/timer.c: > > u64 jiffies_64 __cacheline_aligned_in_smp = INITIAL_JIFFIES; Thanks Randy. So that would mean that wrapping jiffies should be unrelated to the reported panics. Let's wait for Hidetoshi-san's analysis then. Regards, Willy -- 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/