From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751203AbdCBFQH (ORCPT ); Thu, 2 Mar 2017 00:16:07 -0500 Received: from gate.crashing.org ([63.228.1.57]:52816 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750989AbdCBFQG (ORCPT ); Thu, 2 Mar 2017 00:16:06 -0500 Message-ID: <1488431644.2870.64.camel@kernel.crashing.org> Subject: Re: Regression in 4.11 - PowerPC crashes on boot, bisected to commit 5657933dbb6e From: Benjamin Herrenschmidt To: Larry Finger , Bart Van Assche , Thorsten Leemhuis Cc: LKML Date: Thu, 02 Mar 2017 16:14:04 +1100 In-Reply-To: <5bc9c08f-58aa-ef26-8891-4837e2d4184b@lwfinger.net> References: <5bc9c08f-58aa-ef26-8891-4837e2d4184b@lwfinger.net> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.22.5 (3.22.5-1.fc25) Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2017-03-01 at 21:26 -0600, Larry Finger wrote: > My Powerbook G4 Aluminum generates a fatal splat early in the boot process, just  > after identifying the driver for the disk. Unfortunately, it turns off almost  > immediately, thus I cannot report the message. After this bug has been  > triggered, the system clock has been reset to Dec. 31, 1969. I assume this is a  > side effect of an uncontrolled DMA operation. > > This problem has been bisected to commit 5657933dbb6e ("treewide: Move dma_ops  > from struct dev_archdata into struct device"). Side effect of a crash during boot... the PMU gets upset when we crash while there's a request in flight, that's probably what is happening. As to why that commit is broken, I don't have time to look into it right now, maybe next week of nobody beats me to it. Cheers, Ben.