From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753420AbbCPIQ4 (ORCPT ); Mon, 16 Mar 2015 04:16:56 -0400 Received: from ozlabs.org ([103.22.144.67]:37721 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750822AbbCPIQw (ORCPT ); Mon, 16 Mar 2015 04:16:52 -0400 Message-ID: <1426493810.4716.0.camel@ellerman.id.au> Subject: Re: linux panic on 4.0.0-rc4 From: Michael Ellerman To: Pranith Kumar Cc: "open list:LINUX FOR POWERPC..." , LKML Date: Mon, 16 Mar 2015 19:16:50 +1100 In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.12.10-0ubuntu1~14.10.1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2015-03-16 at 01:34 -0400, Pranith Kumar wrote: > On Mon, Mar 16, 2015 at 1:11 AM, Pranith Kumar wrote: > > Hello, > > > > I have a power mac mini 32-bit system. > > > ... > > You can see the panic message here: http://imgur.com/s1lH15g. (there > > is no log and I have no serial console). > > There was some debug code in there when it hit. The actual hang seems > to be in printk_late_init(). It does not return from this. May be this > is a hint? That is where the boot consoles get disabled and it switches to the "real" console. It suggests that the system is not "hung" there but you just lost output. Try booting with "keep_bootcon" ? If that doesn't help try booting with "udbg-immortal". cheers