From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756957AbdLWSkx (ORCPT ); Sat, 23 Dec 2017 13:40:53 -0500 Received: from Galois.linutronix.de ([146.0.238.70]:58810 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752767AbdLWSkv (ORCPT ); Sat, 23 Dec 2017 13:40:51 -0500 Date: Sat, 23 Dec 2017 19:40:34 +0100 (CET) From: Thomas Gleixner To: kernel test robot cc: LKP , xen-devel@lists.xenproject.org, kasan-dev@googlegroups.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Ingo Molnar , wfg@linux.intel.com Subject: Re: 92a0f81d89 ("x86/cpu_entry_area: Move it out of the fixmap"): BUG: kernel hang in boot stage In-Reply-To: <5a3e8fc0.twXCoyu5pJQz+3SI%fengguang.wu@intel.com> Message-ID: References: <5a3e8fc0.twXCoyu5pJQz+3SI%fengguang.wu@intel.com> User-Agent: Alpine 2.20 (DEB 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 24 Dec 2017, kernel test robot wrote: > Greetings, > > 0day kernel testing robot got the below dmesg and the first bad commit is > > https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/pti > > commit 92a0f81d89571e3e8759366e050ee05cc545ef99 > Author: Thomas Gleixner > AuthorDate: Wed Dec 20 18:51:31 2017 +0100 > Commit: Ingo Molnar > CommitDate: Fri Dec 22 20:13:05 2017 +0100 > > x86/cpu_entry_area: Move it out of the fixmap Yes, I'm an idiot. for (; start < end; start += PMD_SIZE) which works fine when start + PMD_SIZE does not wrap around to 0 .... Fix is on the way to git. Thanks, tglx