Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756507AbYCDFG4 (ORCPT ); Tue, 4 Mar 2008 00:06:56 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751009AbYCDFGp (ORCPT ); Tue, 4 Mar 2008 00:06:45 -0500 Received: from smtp1.linux-foundation.org ([140.211.169.13]:52852 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750834AbYCDFGo (ORCPT ); Tue, 4 Mar 2008 00:06:44 -0500 Date: Mon, 3 Mar 2008 21:05:40 -0800 From: Andrew Morton To: netdev@vger.kernel.org, Ingo Molnar , linux-kernel@vger.kernel.org, Stephen Hemminger , "Rafael J. Wysocki" Subject: Re: locking api self-test hanging Message-Id: <20080303210540.cea55e13.akpm@linux-foundation.org> In-Reply-To: <20080206011643.d9021649.akpm@linux-foundation.org> References: <20080203150246.50647fa4.akpm@linux-foundation.org> <20080203150744.cf7d0415.akpm@linux-foundation.org> <20080204044304.d244e761.akpm@linux-foundation.org> <20080206003412.dca555d4.akpm@linux-foundation.org> <20080206011643.d9021649.akpm@linux-foundation.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 List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2609 Lines: 68 On Wed, 6 Feb 2008 01:16:43 -0800 Andrew Morton wrote: > On Wed, 6 Feb 2008 00:34:12 -0800 Andrew Morton wrote: > > > On Mon, 4 Feb 2008 04:43:04 -0800 Andrew Morton wrote: > > > > > On Sun, 3 Feb 2008 15:07:44 -0800 Andrew Morton wrote: > > > > > > > On Sun, 3 Feb 2008 15:02:46 -0800 Andrew Morton wrote: > > > > > > > > > > > > > > With current mainline I'm getting intermittent hangs here: > > > > > > > > > > http://userweb.kernel.org/~akpm/p2033590.jpg > > > > > > > > > > with this config: > > > > > > > > > > http://userweb.kernel.org/~akpm/config-sony.txt > > > > > > > > > > on the Vaio. Sometimes it boots (then hits another different hang), > > > > > sometimes it gets stuck there. > > > > > > CONFIG_DEBUG_LOCKING_API_SELFTESTS=n fixed that up. > > > > > > > > > > > The second hang is in kobject_uevent_init(). All that function does is call > > > > netlink_kernel_create(). > > > > > > And I've fully bisected this hang twice and both times came up with > > > > > > commit 33f807ba0d9259e7c75c7a2ce8bd2787e5b540c7 > > > Author: Stephen Hemminger > > > Date: Mon Nov 19 19:24:52 2007 -0800 > > > > > > [NETPOLL]: Kill NETPOLL_RX_DROP, set but never tested. > > > > > > which is stupid because that patch doesn't do anything. > > > > > > However I am using netconsole-over-e100 and the hang does go away when I > > > disable netconsole on the kernel boot command line. > > > > > > I'd say it's some timing thing in netpoll/netconsole/napi/etc. > > > > > > > I'm seeing this netconsole hang on a second machine now. Current > > mainline. It also has e100. This one is SMP ancient PIII. > > > > Config: http://userweb.kernel.org/~akpm/config-vmm.txt > > > > I can reproduce this on a third machine: the t61p laptop: dual x86_64 with > e1000. > > It seems to need quite a lot of printk activity to make it happen. Turning > on initcall_debug is a suitable way of triggering it. > This netconsole regression is still present in current mainline. Rafael, can you please add it to the list? It's strange that I can hit it on three separate machines with e100 and e1000 yet nobody else has reported it (afaik). Is nobody using netconsole? -- 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/