Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S269464AbUJSPZ4 (ORCPT ); Tue, 19 Oct 2004 11:25:56 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S269458AbUJSPZ4 (ORCPT ); Tue, 19 Oct 2004 11:25:56 -0400 Received: from smtp3.netcabo.pt ([212.113.174.30]:14473 "EHLO smtp.netcabo.pt") by vger.kernel.org with ESMTP id S269464AbUJSPZs (ORCPT ); Tue, 19 Oct 2004 11:25:48 -0400 Message-ID: <28172.195.245.190.93.1098199429.squirrel@195.245.190.93> In-Reply-To: <20041019144642.GA6512@elte.hu> References: <20041012123318.GA2102@elte.hu> <20041012195424.GA3961@elte.hu> <20041013061518.GA1083@elte.hu> <20041014002433.GA19399@elte.hu> <20041014143131.GA20258@elte.hu> <20041014234202.GA26207@elte.hu> <20041015102633.GA20132@elte.hu> <20041016153344.GA16766@elte.hu> <20041018145008.GA25707@elte.hu> <20041019124605.GA28896@elte.hu> <20041019144642.GA6512@elte.hu> Date: Tue, 19 Oct 2004 16:23:49 +0100 (WEST) Subject: Re: [patch] Real-Time Preemption, -RT-2.6.9-rc4-mm1-U6 From: "Rui Nuno Capela" To: "Ingo Molnar" Cc: linux-kernel@vger.kernel.org, "Lee Revell" , mark_h_johnson@raytheon.com, "K.R. Foley" , "Bill Huey" , "Adam Heath" , "Florian Schmidt" , "Thomas Gleixner" , "Michal Schmidt" , "Fernando Pablo Lopez-Lezcano" User-Agent: SquirrelMail/1.4.3a X-Mailer: SquirrelMail/1.4.3a MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT X-Priority: 3 (Normal) Importance: Normal X-OriginalArrivalTime: 19 Oct 2004 15:25:41.0720 (UTC) FILETIME=[E502E580:01C4B5EF] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1343 Lines: 37 Ingo Molnar wrote: > >> i have released the -U6 Real-Time Preemption patch: >> >> http://redhat.com/~mingo/realtime-preempt/realtime-preempt-2.6.9-rc4-mm1-U6 > I'm experiencing terrible kernel panics at a very early bootstrap stage while testing the U5 and U6 latest patch(es) on my laptop (P4/UP) -- (Ingo: this is about the very same trouble I've reported while pre-testing U6). Sorry that I can't show any trace dumps; only a hard-screenshot (with digital camera?) would be possible but rather incomplete. The serial console hack is not an option--these "modern" laptops doesn't come with serial ports anymore, and netconsole is a no-op at a so early point of the boot process. Or so I believe. OK. After some incremental configurations, I've isolated that those oops(es) only occurs if PREEMPT_TIMING and/or LATENCY_TRACE areset (Y). My first suspect was that newest RWSEM_DEADLOCK_DETECT, but it wasn't the case. So something has broken on that non-preemptible critical section timing stuff since U4. Hasn't anybody else stumbled on this? -- rncbc aka Rui Nuno Capela rncbc@rncbc.org - 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/