Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759848AbXEOFJV (ORCPT ); Tue, 15 May 2007 01:09:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756721AbXEOFJO (ORCPT ); Tue, 15 May 2007 01:09:14 -0400 Received: from smtp1.linux-foundation.org ([65.172.181.25]:35205 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756330AbXEOFJM (ORCPT ); Tue, 15 May 2007 01:09:12 -0400 Date: Mon, 14 May 2007 22:09:01 -0700 From: Andrew Morton To: Thomas Gleixner , john stultz Cc: linux-kernel@vger.kernel.org, "bugme-daemon@kernel-bugs.osdl.org" , dang@gentoo.org Subject: Re: [Bugme-new] [Bug 8479] New: gettimeofday returning 1000000 in tv_usec on core2duo Message-Id: <20070514220901.90aab9e0.akpm@linux-foundation.org> In-Reply-To: <200705150417.l4F4HlvS013354@fire-2.osdl.org> References: <200705150417.l4F4HlvS013354@fire-2.osdl.org> X-Mailer: Sylpheed 2.4.1 (GTK+ 2.8.17; x86_64-unknown-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1385 Lines: 35 On Mon, 14 May 2007 21:17:47 -0700 bugme-daemon@bugzilla.kernel.org wrote: > http://bugzilla.kernel.org/show_bug.cgi?id=8479 > > Summary: gettimeofday returning 1000000 in tv_usec on core2duo > Kernel Version: 2.6.21 > Status: NEW > Severity: normal > Owner: ak@suse.de > Submitter: dang@gentoo.org > > > Most recent kernel where this bug did *NOT* occur: 2.6.20 > Distribution: Gentoo > Hardware Environment: core2duo T7200 (all reporters had this same CPU) > Software Environment: Linux 2.6.21, glibc 2.5 > Problem Description: > > gettimeofday returns 1 - 1000000 in tv_usec, not 0 - 999999 > This does not happen on any of my AMD-based 32 or 64 bit boxes, only on my > core2duo; I have 2 other reports of this problem, all on T7200's > > Steps to reproduce: > > call gettimeofday a lot. Eventually, you'll get 1000000 returned in tv_usec. My > average is ~1 in 1000000 calls. I've attached my test program, with output from > various boxes. One of the other reporters tried the test program too, and got > similar output. .config will be attached too. err, whoops. - 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/