Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965313AbbKDMEE (ORCPT ); Wed, 4 Nov 2015 07:04:04 -0500 Received: from vserver.eikelenboom.it ([84.200.39.61]:53475 "EHLO smtp.eikelenboom.it" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751016AbbKDMEB (ORCPT ); Wed, 4 Nov 2015 07:04:01 -0500 X-Greylist: delayed 419 seconds by postgrey-1.27 at vger.kernel.org; Wed, 04 Nov 2015 07:04:01 EST MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Date: Wed, 04 Nov 2015 12:55:35 +0100 From: Sander Eikelenboom To: Stephen Smalley , David Vrabel Cc: xen-devel@lists.xen.org, linux-kernel@vger.kernel.org Subject: Linux 4.4 MW: Boot under Xen fails with =?UTF-8?Q?CONFIG=5FDEBUG?= =?UTF-8?Q?=5FWX=20enabled=3A=20RIP=3A=20ptdump=5Fwalk=5Fpgd=5Flevel=5Fcor?= =?UTF-8?Q?e?= Message-ID: <9184aedc84bf5274c290183fa60b48e9@eikelenboom.it> User-Agent: Roundcube Webmail/0.9.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3469 Lines: 80 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 [ 18.507102] RSP: e02b:ffff880059b9be48 EFLAGS: 00010296 [ 18.513351] RAX: ffff88055c883000 RBX: ffffffff81ae2000 RCX: ffff880000000000 [ 18.519733] RDX: 0000000000000067 RSI: ffff880059b9be98 RDI: ffff880000001000 [ 18.526129] RBP: ffff880059b9bf00 R08: 0000000000000000 R09: 0000000000000000 [ 18.532522] R10: ffff88005fd0e790 R11: 0000000000000001 R12: ffff880080000000 [ 18.538891] R13: ffffc00000000fff R14: ffff880059b9be98 R15: 0000000000000000 [ 18.545247] FS: 0000000000000000(0000) GS:ffff88005f680000(0000) knlGS:0000000000000000 [ 18.551708] CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b [ 18.558153] CR2: ffff88055c883000 CR3: 0000000002211000 CR4: 0000000000000660 [ 18.564686] Stack: [ 18.571106] 0000000159b9be50 ffffffff82211000 ffff88055c884000 0000000000000800 [ 18.577704] 0000800000000000 ffff88055c883000 0000000000000007 ffff88005fd0e790 [ 18.584291] ffff880059b9bed8 ffffffff81156ace 0000000000000001 0000000000000000 [ 18.590916] Call Trace: [ 18.597458] [] ? free_reserved_area+0x11e/0x120 [ 18.604180] [] ptdump_walk_pgd_level_checkwx+0x12/0x20 [ 18.611014] [] mark_rodata_ro+0xe9/0xf0 [ 18.617819] [] ? rest_init+0x80/0x80 [ 18.624512] [] kernel_init+0x18/0xe0 [ 18.631095] [] ret_from_fork+0x3f/0x70 [ 18.637650] [] ? rest_init+0x80/0x80 [ 18.644178] Code: 70 ff ff ff 48 3b 85 58 ff ff ff 0f 84 c0 fe ff ff 48 8b 85 68 ff ff ff 48 c1 e0 10 48 c1 f8 10 48 89 45 b0 48 8b 85 70 ff ff ff <48> 8b 38 48 85 ff 0f 85 4e ff ff ff b9 02 00 00 00 31 d2 4c 89 [ 18.658246] RIP [] ptdump_walk_pgd_level_core+0x20e/0x440 [ 18.665211] RSP [ 18.672073] CR2: ffff88055c883000 [ 18.678852] ---[ end trace d84e34461c40637a ]--- [ 18.685641] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009 [ 18.685641] [ 18.699520] Kernel Offset: disable -- 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/