Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751672AbaANSrw (ORCPT ); Tue, 14 Jan 2014 13:47:52 -0500 Received: from terminus.zytor.com ([198.137.202.10]:55142 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751458AbaANSru (ORCPT ); Tue, 14 Jan 2014 13:47:50 -0500 Message-ID: <52D58647.4010208@zytor.com> Date: Tue, 14 Jan 2014 10:47:35 -0800 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 MIME-Version: 1.0 To: Kees Cook , Fengguang Wu CC: "H. Peter Anvin" , LKML Subject: Re: [x86, kaslr] BUG: kernel boot hang References: <20140114133125.GB26942@localhost> In-Reply-To: X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 01/14/2014 10:26 AM, Kees Cook wrote: >> >> [ 0.000000] Base memory trampoline at [ffff880000099000] 99000 size 24576 >> [ 0.000000] init_memory_mapping: [mem 0x00000000-0x000fffff] >> [ 0.000000] [mem 0x00000000-0x000fffff] page 4k >> [ 0.000000] BRK [0x07886000, 0x07886fff] PGTABLE >> [ 0.000000] BRK [0x07887000, 0x07887fff] PGTABLE >> [ 0.000000] BRK [0x07888000, 0x07888fff] PGTABLE >> PANIC: early exception 0e rip 10:ffffffff86204c6e error 0 cr2 ffffffff81972b28 >> [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.12.0-rc4-00008-g6e6a493 #614 >> PANIC: early exception 0e rip 10:ffffffff86204f22 error 0 cr2 ffffffff81972b28 > > I will try to reproduce this, but it's not clear to me what is causing > the failure. The generated config doesn't look insane to me, so I'm > not sure what's happening here. Is QEMU doing something unexpected > with the ordering of where things go for its boot loader? > It used to, but I fixed it up a long time ago and now it is really bog standard. More likely it just happens to trigger a corner condition, which is actually a good thing... much easier to debug in a simulator. -hpa -- 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/