From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754793AbZHYPsn (ORCPT ); Tue, 25 Aug 2009 11:48:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754127AbZHYPsm (ORCPT ); Tue, 25 Aug 2009 11:48:42 -0400 Received: from mta-2.ms.rz.RWTH-Aachen.DE ([134.130.7.73]:63446 "EHLO mta-2.ms.rz.rwth-aachen.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754055AbZHYPsm (ORCPT ); Tue, 25 Aug 2009 11:48:42 -0400 MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: text/plain; charset=ISO-8859-15 X-IronPort-AV: E=Sophos;i="4.44,273,1249250400"; d="scan'208";a="23636580" Message-id: <4A9407B1.6020400@nets.rwth-aachen.de> Date: Tue, 25 Aug 2009 17:48:01 +0200 From: Arnd Hannemann User-Agent: Thunderbird 2.0.0.23 (X11/20090817) To: LKML Cc: penberg@cs.helsinki.fi, hannes@cmpxchg.org, torvalds@linux-foundation.org Subject: [bisected] 2.6.31 regression: fails to boot as xen guest Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, current 2.6.31 fails to boot on our xen host (32bit pae). Unfortunately it fails in a way that there is absolutely no output on the console. Config is as 32bit guest. Git bisect gave the following: 83b519e8b9572c319c8e0c615ee5dd7272856090 is first bad commit commit 83b519e8b9572c319c8e0c615ee5dd7272856090 Author: Pekka Enberg Date: Wed Jun 10 19:40:04 2009 +0300 slab: setup allocators earlier in the boot sequence This patch makes kmalloc() available earlier in the boot sequence so we can get rid of some bootmem allocations. The bulk of the changes are due to kmem_cache_init() being called with interrupts disabled which requires some changes to allocator boostrap code. Note: 32-bit x86 does WP protect test in mem_init() so we must setup traps before we call mem_init() during boot as reported by Ingo Molnar: We have a hard crash in the WP-protect code: [ 0.000000] Checking if this processor honours the WP bit even in supervisor mode...BUG: Int 14: CR2 ffcff000 [ 0.000000] EDI 00000188 ESI 00000ac7 EBP c17eaf9c ESP c17eaf8c [ 0.000000] EBX 000014e0 EDX 0000000e ECX 01856067 EAX 00000001 [ 0.000000] err 00000003 EIP c10135b1 CS 00000060 flg 00010002 [ 0.000000] Stack: c17eafa8 c17fd410 c16747bc c17eafc4 c17fd7e5 000011fd f8616000 c18237cc [ 0.000000] 00099800 c17bb000 c17eafec c17f1668 000001c5 c17f1322 c166e039 c1822bf0 [ 0.000000] c166e033 c153a014 c18237cc 00020800 c17eaff8 c17f106a 00020800 01ba5003 [ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.30-tip-02161-g7a74539-dirty #52203 [ 0.000000] Call Trace: [ 0.000000] [] ? printk+0x14/0x16 [ 0.000000] [] ? do_test_wp_bit+0x19/0x23 [ 0.000000] [] ? test_wp_bit+0x26/0x64 [ 0.000000] [] ? mem_init+0x1ba/0x1d8 [ 0.000000] [] ? start_kernel+0x164/0x2f7 [ 0.000000] [] ? unknown_bootoption+0x0/0x19c [ 0.000000] [] ? __init_begin+0x6a/0x6f Acked-by: Johannes Weiner Acked-by Linus Torvalds Cc: Christoph Lameter Cc: Ingo Molnar Cc: Matt Mackall Cc: Nick Piggin Cc: Yinghai Lu Signed-off-by: Pekka Enberg However a git revert 83b519e8b9572c319c8e0c615ee5dd7272856090 to verify that current git without that commit would work, didn't succeed right away, so I was not able to test that. BTW: I only included Acked-by and Signed-off-by as Cc: and dropped the other Cc: mentioned in the commit, hope that was ok... Best regards, Arnd