Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751600AbdFIUZQ (ORCPT ); Fri, 9 Jun 2017 16:25:16 -0400 Received: from mx2.suse.de ([195.135.220.15]:36247 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751554AbdFIUZP (ORCPT ); Fri, 9 Jun 2017 16:25:15 -0400 Date: Fri, 09 Jun 2017 22:25:13 +0200 Message-ID: From: Takashi Iwai To: Greg Kroah-Hartman , Ben Skeggs Cc: "Luigi Baldoni" , linux-stable@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [4.4.70 REGRESSION] Nouveau hangs up at boot User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.8 Emacs/25.2 (x86_64-suse-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") 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: 1445 Lines: 39 Hi, we've received a bug report about 4.4.70 kernel showing the hang up at boot. And, this turned out to be a regression in nouveau driver: https://bugzilla.suse.com/show_bug.cgi?id=1043467 I provided a test kernel reverting the last five commits about nouveau below, and it was confirmed to work. But still not figured out which one actually breaks. e4add1cf6b4154804350c3385c6d447cff3570de drm/nouveau/tmr: handle races with hw when updating the next alarm time commit 1b0f84380b10ee97f7d2dd191294de9017e94d1d upstream. 9d78e40f5f41ad1db1849f8d15acbda99d0871b4 drm/nouveau/tmr: avoid processing completed alarms when adding a new one commit 330bdf62fe6a6c5b99a647f7bf7157107c9348b3 upstream. 5e07724c28f4e06fe42dd5b58bb6f9dd56510567 drm/nouveau/tmr: fix corruption of the pending list when rescheduling an alarm commit 9fc64667ee48c9a25e7dca1a6bcb6906fec5bcc5 upstream. 27f82df2f02688c51d2c1d9f624cc0c5b8a62661 drm/nouveau/tmr: ack interrupt before processing alarms commit 3733bd8b407211739e72d051e5f30ad82a52c4bc upstream. 3819271d8a5f4c6e0c8f71c339e44e2efbe40710 drm/nouveau/therm: remove ineffective workarounds for alarm bugs commit e4311ee51d1e2676001b2d8fcefd92bdd79aad85 upstream. Ben, is this a known problem? Or is there any fixup? The kernel back trace found in the bugzilla report shows the issue in nvkm_timer_alarm_trigger(), at least. thanks, Takashi