Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934378Ab3JPND1 (ORCPT ); Wed, 16 Oct 2013 09:03:27 -0400 Received: from cdptpa-outbound-snat.email.rr.com ([107.14.166.225]:6444 "EHLO cdptpa-oedge-vip.email.rr.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S934104Ab3JPND0 (ORCPT ); Wed, 16 Oct 2013 09:03:26 -0400 Date: Wed, 16 Oct 2013 09:03:25 -0400 From: Steven Rostedt To: Ingo Molnar Cc: LKML , Thomas Gleixner , "H. Peter Anvin" , Frederic Weisbecker , Andrew Morton , "paulmck@linux.vnet.ibm.com" , Peter Zijlstra , "x86@kernel.org" , "Wang, Xiaoming" , "Li, Zhuangzhi" , "Liu, Chuansheng" Subject: Re: [PATCH] x86: Remove WARN_ON(in_nmi()) from vmalloc_fault Message-ID: <20131016090325.11daee3a@gandalf.local.home> In-Reply-To: <20131016125111.GB2611@gmail.com> References: <20131015163906.342d8ffa@gandalf.local.home> <20131016061118.GA21109@gmail.com> <20131016084219.53deac7a@gandalf.local.home> <20131016125111.GB2611@gmail.com> X-Mailer: Claws Mail 3.9.2 (GTK+ 2.24.20; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-RR-Connecting-IP: 107.14.168.118:25 X-Cloudmark-Score: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 597 Lines: 17 On Wed, 16 Oct 2013 14:51:11 +0200 Ingo Molnar wrote: > So kallsyms_lookup() faulted, while the NMI watchdog triggered a > show_regs()? How is that possible? It was a vmalloc fault. Do modules keep their symbol tables in a vmalloced area? If so, I think the get_ksymbol() can fault when searching for a module address. -- Steve -- 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/