Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753083AbbB1WTM (ORCPT ); Sat, 28 Feb 2015 17:19:12 -0500 Received: from mail-qc0-f176.google.com ([209.85.216.176]:37113 "EHLO mail-qc0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751975AbbB1WTL (ORCPT ); Sat, 28 Feb 2015 17:19:11 -0500 From: "Justin Piszcz" To: References: <003701d0529d$37ed8340$a7c889c0$@lucidpixels.com> <003b01d052a5$8f437a70$adca6f50$@lucidpixels.com> In-Reply-To: <003b01d052a5$8f437a70$adca6f50$@lucidpixels.com> Subject: RE: 3.19 kernel: BUG: unable to handle kernel NULL pointer dereference Date: Sat, 28 Feb 2015 17:19:07 -0500 Message-ID: <005801d053a4$929e1540$b7da3fc0$@lucidpixels.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQIubbFbcrw02TXxmORwRo5ZIQA/yQJVkv4PnDfAAoA= Content-Language: en-us Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1579 Lines: 56 > -----Original Message----- > From: Justin Piszcz [mailto:jpiszcz@lucidpixels.com] > Sent: Friday, February 27, 2015 10:54 AM > To: linux-kernel@vger.kernel.org > Subject: RE: 3.19 kernel: BUG: unable to handle kernel NULL pointer > dereference > > > > > -----Original Message----- > > From: Justin Piszcz [mailto:jpiszcz@lucidpixels.com] > > Sent: Friday, February 27, 2015 9:54 AM > > To: linux-kernel@vger.kernel.org > > Subject: 3.19 kernel: BUG: unable to handle kernel NULL pointer > dereference > > > > Hello, > > > > With kernel 3.15, I do not recall having any issues, with 3.19, I am > getting > > a kernel crash when I copy files over NFS from machine A to B. > > Is this a known issue? > > > > I suspect it has to do something with this: > > Feb 27 09:31:20 remote-host [ 15.745342] dmar: DRHD: handling fault > status > > reg 2 > > Feb 27 09:31:20 remote-host [ 15.745361] dmar: DMAR:[DMA Read] > Request > > device [04:00.0] fault addr 0 #012[ 15.745361] DMAR:[fault reason 06] > PTE > > Read access is not set > > > > [ .. ] > > Here is another crash with debugging enabled: > [ .. ] https://bbs.archlinux.org/viewtopic.php?id=176398 https://forums.opensuse.org/showthread.php/497436-DMAR-errors-with-VT-d-enab led I disabled Virtualization in the kernel and this works around the problem. Justin. -- 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/