Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751024AbdL3KCo (ORCPT ); Sat, 30 Dec 2017 05:02:44 -0500 Received: from twin.jikos.cz ([91.219.245.39]:46876 "EHLO twin.jikos.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750841AbdL3KCm (ORCPT ); Sat, 30 Dec 2017 05:02:42 -0500 X-Greylist: delayed 537 seconds by postgrey-1.27 at vger.kernel.org; Sat, 30 Dec 2017 05:02:41 EST Date: Sat, 30 Dec 2017 10:53:33 +0100 (CET) From: Jiri Kosina To: Linus Torvalds cc: =?ISO-8859-15?Q?Toralf_F=F6rster?= , Alexander Tsoy , Andy Lutomirski , stable , Linux Kernel , the arch/x86 maintainers Subject: Re: 4.14.9 doesn't boot (regression) In-Reply-To: Message-ID: References: <33249a35-7d6a-f0f3-5a98-e6474f9366e3@gmx.de> User-Agent: Alpine 2.00 (LRH 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 621 Lines: 17 On Fri, 29 Dec 2017, Linus Torvalds wrote: > Ok, so what does seem to be consistent for everybody is that > double-fault in the NMI backtrace. > > So the fact that the NMI always hits on a double-fault does make me > suspect that it's a infinite stream of double-faults, and that is > presumably also what causes the RCU timeout. As I've been fighting with recursive double-faults lately (backporting PTI to ancient kernels), I can tell you that this is not the symptom you'd be seeing in such case; recursive double fault pretty quickly overflows the interrupt stack and triple-faults. -- Jiri Kosina SUSE Labs