Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761485Ab3DGNd5 (ORCPT ); Sun, 7 Apr 2013 09:33:57 -0400 Received: from mail.skyhub.de ([78.46.96.112]:48018 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760846Ab3DGNdz (ORCPT ); Sun, 7 Apr 2013 09:33:55 -0400 Date: Sun, 7 Apr 2013 15:33:46 +0200 From: Borislav Petkov To: Dave Hansen Cc: linux-kernel@vger.kernel.org, hpa@linux.intel.com, penguin-kernel@i-love.sakura.ne.jp, x86@kernel.org, akpm@linux-foundation.org, suresh.b.siddha@intel.com, khlebnikov@openvz.org, bhelgaas@google.com Subject: Re: [PATCH] do not try to sync identity map for non-mapped pages Message-ID: <20130407133346.GD31299@pd.tnic> Mail-Followup-To: Borislav Petkov , Dave Hansen , linux-kernel@vger.kernel.org, hpa@linux.intel.com, penguin-kernel@i-love.sakura.ne.jp, x86@kernel.org, akpm@linux-foundation.org, suresh.b.siddha@intel.com, khlebnikov@openvz.org, bhelgaas@google.com References: <20130307163151.D9B58C4E@kernel.stglabs.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20130307163151.D9B58C4E@kernel.stglabs.ibm.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2782 Lines: 60 Hey Dave, On Thu, Mar 07, 2013 at 08:31:51AM -0800, Dave Hansen wrote: > > The original bug reporter says this fixes it for him, so I'm > broadening the cc list a bit. I assume this should just get > sucked in to the x86 tree. looks like we haven't whacked all the moles - I keep seeing this when testing 32-bit builds in qemu on latest Linus + tip. I'd guess this is still that /dev/mem accessing thing called wdm. I'm still wondering though whether we should BUG_ON on a /dev/mem access? I've added debug output to show why we're triggering: [ 471.102902] slow_virt_to_phys((void *)x): 0x0, phys_addr: 0x37bfe000 [ 471.119500] ------------[ cut here ]------------ [ 471.119500] kernel BUG at arch/x86/mm/physaddr.c:85! [ 471.119500] invalid opcode: 0000 [#1] PREEMPT SMP [ 471.119500] Modules linked in: [ 471.119500] Pid: 1571, comm: wdm Not tainted 3.9.0-rc5+ #42 Bochs Bochs [ 471.119500] EIP: 0060:[] EFLAGS: 00000206 CPU: 0 [ 471.119500] EIP is at __phys_addr+0x86/0xb0 [ 471.119500] EAX: 37bfe000 EBX: 37bfe000 ECX: 00000001 EDX: 37bfe000 [ 471.119500] ESI: f7bfe000 EDI: 00002000 EBP: f67f1f3c ESP: f67f1f28 [ 471.119500] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 [ 471.119500] CR0: 8005003b CR2: bfeb12d4 CR3: 35edd000 CR4: 000006f0 [ 471.119500] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 471.119500] DR6: 00000000 DR7: 00000000 [ 471.119500] Process wdm (pid: 1571, ti=f67f0000 task=f5c90000 task.ti=f67f0000) [ 471.119500] Stack: [ 471.119500] c16b1f2c 00000000 37bfe000 00000000 00002000 f67f1f64 c131d074 00002000 [ 471.119500] 00000246 bfeb12ec 00000000 00000000 f67a6c40 c131d040 00002000 f67f1f8c [ 471.119500] c1129c85 f67f1f98 f67f0000 f5ebe864 c131d040 00000020 f67a6c40 00000000 [ 471.119500] Call Trace: [ 471.119500] [] read_mem+0x34/0x100 [ 471.119500] [] ? write_mem+0x110/0x110 [ 471.119500] [] vfs_read+0x85/0x130 [ 471.119500] [] ? write_mem+0x110/0x110 [ 471.119500] [] sys_read+0x47/0xa0 [ 471.119500] [] sysenter_do_call+0x12/0x36 [ 471.119500] Code: 0b a1 88 ae 0c c2 05 00 00 80 00 39 c6 72 bb a1 ac 1a 76 c1 2d 00 a0 3e 00 25 00 00 e0 ff 2d 00 20 00 00 39 c6 73 a3 0f 0b 0f 0b <0f> 0b 89 f0 e8 41 ca ff ff 89 5c 24 08 89 44 24 04 c7 04 24 2c [ 471.119500] EIP: [] __phys_addr+0x86/0xb0 SS:ESP 0068:f67f1f28 [ 471.508967] ---[ end trace 5fc00ac35d61284a ]--- Hmmm. -- Regards/Gruss, Boris. Sent from a fat crate under my desk. Formatting is fine. -- -- 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/