Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754855Ab3CLBOI (ORCPT ); Mon, 11 Mar 2013 21:14:08 -0400 Received: from mail-la0-f43.google.com ([209.85.215.43]:56656 "EHLO mail-la0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754467Ab3CLBOG (ORCPT ); Mon, 11 Mar 2013 21:14:06 -0400 MIME-Version: 1.0 Date: Tue, 12 Mar 2013 09:14:03 +0800 Message-ID: Subject: Bug involving dynamic_debug and '-p' modifier From: Andrew Cooks To: Jason Baron 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: 1242 Lines: 32 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. -- 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/