Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932175Ab3CLC24 (ORCPT ); Mon, 11 Mar 2013 22:28:56 -0400 Received: from mail-lb0-f181.google.com ([209.85.217.181]:54439 "EHLO mail-lb0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932101Ab3CLC2z (ORCPT ); Mon, 11 Mar 2013 22:28:55 -0400 MIME-Version: 1.0 In-Reply-To: References: Date: Tue, 12 Mar 2013 10:28:53 +0800 Message-ID: Subject: Re: Bug involving dynamic_debug and '-p' modifier From: Andrew Cooks To: Jason Baron , Jim Cromie Cc: open list Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1479 Lines: 36 On Tue, Mar 12, 2013 at 9:14 AM, Andrew Cooks wrote: > Hi Jason > > When I specify a '-p' modifier in the dynamic debug options in the > kernel command line, I get a kernel panic during boot. The panic > happens after userspace starts doing graphical stuff, but I haven't > been able to pinpoint exactly what. > > If I use '=_' instead of '-p', or boot to a recovery mode, or change > the modifier after booting using debugfs, the panic doesn't occur. For > example, booting to runlevel 3 with '=_', then flipping the same > modifier to first to '+p' and then to '-p', before starting X does not > result in a panic. > > Booting to runlevel 3 (or even 1!), with '-p' results in a panic, but > 'rdshell' is OK. > > I also tried the Red Hat kernel (just because it's installed - I > haven't figured out how to tell the package manager that I don't want > a kernel). This also panics, but it says that '-p' is not supported. > > Please let me know if you need me to do any other tests. > > '-p', panic: http://pastebin.com/8yAcBQdY > '-p', rdshell, no panic: http://pastebin.com/Hi2a7BZA > > -- > a. Jason's mail bounced, so redirecting to Jim Cromie, who made the most recent significant changes to dynamic_debug... -- 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/