Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756214AbbKDSHD (ORCPT ); Wed, 4 Nov 2015 13:07:03 -0500 Received: from mail-wm0-f43.google.com ([74.125.82.43]:36788 "EHLO mail-wm0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755162AbbKDSHB (ORCPT ); Wed, 4 Nov 2015 13:07:01 -0500 Date: Wed, 4 Nov 2015 19:06:56 +0100 From: Ingo Molnar To: Stephen Smalley Cc: Sander Eikelenboom , David Vrabel , xen-devel@lists.xen.org, linux-kernel@vger.kernel.org, "x86@kernel.org" Subject: Re: Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core Message-ID: <20151104180655.GA9892@gmail.com> References: <9184aedc84bf5274c290183fa60b48e9@eikelenboom.it> <563A29C4.7020400@tycho.nsa.gov> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <563A29C4.7020400@tycho.nsa.gov> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1784 Lines: 50 * Stephen Smalley wrote: > On 11/04/2015 06:55 AM, Sander Eikelenboom wrote: > >Hi All, > > > >I just tried to boot with the current linus mergewindow tree under Xen. > >It fails with a kernel panic at boot with the new "CONFIG_DEBUG_WX" > >option enabled. > >Disabling it makes the kernel boot fine. > > > >The splat: > >[ 18.424241] Freeing unused kernel memory: 1104K (ffffffff822fc000 - > >ffffffff82410000) > >[ 18.430314] Write protecting the kernel read-only data: 18432k > >[ 18.441054] Freeing unused kernel memory: 1144K (ffff880001ae2000 - > >ffff880001c00000) > >[ 18.447966] Freeing unused kernel memory: 1560K (ffff88000207a000 - > >ffff880002200000) > >[ 18.453947] BUG: unable to handle kernel paging request at > >ffff88055c883000 > >[ 18.459943] IP: [] > >ptdump_walk_pgd_level_core+0x20e/0x440 > >[ 18.465847] PGD 2212067 PUD 0 > >[ 18.471564] Oops: 0000 [#1] SMP > >[ 18.477248] Modules linked in: > >[ 18.482918] CPU: 2 PID: 1 Comm: swapper/0 Not tainted > >4.3.0-mw-20151104-linus-doflr+ #1 > >[ 18.488804] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640) , BIOS > >V1.8B1 09/13/2010 > >[ 18.494778] task: ffff880059b90000 ti: ffff880059b98000 task.ti: > >ffff880059b98000 > >[ 18.500852] RIP: e030:[] [] > >ptdump_walk_pgd_level_core+0x20e/0x440 It would be nice to see which line of code this corresponds to. Doing this: gdb vmlinux list *0xffffffff8105af8e should normally do the trick. Thanks, Ingo -- 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/