From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9CC80C6778A for ; Sat, 30 Jun 2018 00:56:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 56F0B280C2 for ; Sat, 30 Jun 2018 00:56:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 56F0B280C2 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.crashing.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755289AbeF3A4p (ORCPT ); Fri, 29 Jun 2018 20:56:45 -0400 Received: from gate.crashing.org ([63.228.1.57]:43402 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753435AbeF3A4m (ORCPT ); Fri, 29 Jun 2018 20:56:42 -0400 Received: from gate.crashing.org (localhost.localdomain [127.0.0.1]) by gate.crashing.org (8.14.1/8.14.1) with ESMTP id w5U0tXhb001343; Fri, 29 Jun 2018 19:55:34 -0500 Received: (from segher@localhost) by gate.crashing.org (8.14.1/8.14.1/Submit) id w5U0tUKI001338; Fri, 29 Jun 2018 19:55:30 -0500 Date: Fri, 29 Jun 2018 19:55:30 -0500 From: Segher Boessenkool To: Linus Torvalds Cc: Larry Finger , Randy Dunlap , Dave Hansen , Lai Jiangshan , Linux Kernel Mailing List , Matthew Wilcox , Pekka Enberg , Jerome Glisse , Paul Mackerras , "Kirill A. Shutemov" , Martin Schwidefsky , Andrey Ryabinin , Christoph Lameter , ppc-dev , Andrew Morton , Vlastimil Babka Subject: Re: [Update] Regression in 4.18 - 32-bit PowerPC crashes on boot - bisected to commit 1d40a5ea01d5 Message-ID: <20180630005530.GX16221@gate.crashing.org> References: <99169786-61dd-b19c-ac81-84bcd0a67de4@lwfinger.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.3i Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jun 29, 2018 at 02:01:46PM -0700, Linus Torvalds wrote: > On Fri, Jun 29, 2018 at 1:42 PM Larry Finger wrote: > But the real question is what the problem was the *first* time around. > I assume that has scrolled off the screen? This part: > > _exception_pkey+0x58/0x128 > ret_from_except_full+0x0/0x4 > --- interrupt: 700 at free_pgd_range+0x19c/0x30c > LR = free_pgd_range+0x19c/0x30c > free_pgtables+0xa/0xb > exit_mnap+0xf4/0x16c > mmput+0x64/0xf0 > > Does reverting that commit 1d40a5ea01d5 make everything work for you? > Because if so, judging by the deafening silence on this so far, I > think that's what we should do. > > That said, can some ppc person who knows the 32-bit ppc code and maybe > knows what that "interrupt: 700" means talk about that oddity in the > trace, please? 700 is "program interrupt"; here it probably means a BUG() happened (which does a trap instruction, which causes a 700). The stuff that scrolled away should tell more. Segher