Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756638Ab0FDUq6 (ORCPT ); Fri, 4 Jun 2010 16:46:58 -0400 Received: from mga01.intel.com ([192.55.52.88]:33500 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756020Ab0FDUq4 convert rfc822-to-8bit (ORCPT ); Fri, 4 Jun 2010 16:46:56 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.53,363,1272870000"; d="scan'208";a="804852728" From: "Luck, Tony" To: Linus Torvalds CC: Rusty Russell , Dave Young , Stephen Rothwell , "linux-next@vger.kernel.org" , LKML Date: Fri, 4 Jun 2010 13:46:49 -0700 Subject: RE: linux-next: Tree for June 3 Thread-Topic: linux-next: Tree for June 3 Thread-Index: AcsEIfJGUmZRUKMLRVqWnV5TSgULTQABEubw Message-ID: <987664A83D2D224EAE907B061CE93D530114C3DC47@orsmsx505.amr.corp.intel.com> References: <20100603134753.710a64b3.sfr@canb.auug.org.au> <201006032222.57411.rusty@rustcorp.com.au> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 803 Lines: 18 > What does a NaT consumption fault mean, and does it give the invalid > address it was loaded off? This almost always means that we dereferenced a NULL pointer ... though any access into the bottom PAGE_SIZE of kernel virtual address space will result in this trap. This happens on ia64 because we have a "NaT" page mapped at 0x0 so that speculative loads that chase NULL pointers at the end of lists behave more rationally. Sadly I don't have the actual address. The register that was used for the dereference isn't included in the OOPS output. -Tony -- 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/