Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266006AbUIDUEK (ORCPT ); Sat, 4 Sep 2004 16:04:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266013AbUIDUEK (ORCPT ); Sat, 4 Sep 2004 16:04:10 -0400 Received: from mx2.elte.hu ([157.181.151.9]:17032 "EHLO mx2.elte.hu") by vger.kernel.org with ESMTP id S266006AbUIDUEG (ORCPT ); Sat, 4 Sep 2004 16:04:06 -0400 Date: Sat, 4 Sep 2004 22:05:01 +0200 From: Ingo Molnar To: "K.R. Foley" Cc: linux-kernel@vger.kernel.org, Felipe Alfaro Solana , Daniel Schmitt , Lee Revell , Mark_H_Johnson@raytheon.com, "P.O. Gaillard" Subject: Re: [patch] voluntary-preempt-2.6.9-rc1-bk4-R3 Message-ID: <20040904200501.GA15383@elte.hu> References: <20040902063335.GA17657@elte.hu> <20040902065549.GA18860@elte.hu> <20040902111003.GA4256@elte.hu> <20040902215728.GA28571@elte.hu> <4138A56B.4050006@cybsft.com> <20040903181710.GA10217@elte.hu> <20040903193052.GA16617@elte.hu> <413939F8.1030806@cybsft.com> <20040904085717.GA15744@elte.hu> <4139D2C1.2020202@cybsft.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4139D2C1.2020202@cybsft.com> User-Agent: Mutt/1.4.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=-4.9, required 5.9, autolearn=not spam, BAYES_00 -4.90 X-ELTE-SpamLevel: X-ELTE-SpamScore: -4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1332 Lines: 33 * K.R. Foley wrote: > I am glad that it's reproducible for you as well. How did you trigger > it? Because it seems to only crash under heavy load for me. The system > has been up since I rebooted last night after the crash and I haven't > seen any problems. Same thing goes for up until last night when I > booted the new patch. Even building the new patch didn't seem to be > enough to trigger it. i triggered it via two IO-intense scripts running on a 256 MB RAM testbox: cd /tmp; while true; do dd if=/dev/zero of=bigfile bs=1000000 count=500 >/dev/null 2>/dev/null; sync; date; sleep 60; done & while true; do du /usr >/dev/null 2>/dev/null; date; done & usually it triggers within half an hour or so of runtime. With -R4 it didnt crash yet after ~1 hour of running so i'm quite optimistic that this particular bug has been fixed. i think the key to reproduce was to use KP=0,SP=0,HP=0 - this concentrates all preemption activity to the places the VP patch adds - amongst them the one in the do_exit() path that is necessary to trigger the race. Ingo - 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/