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=-4.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS autolearn=no 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 1E5CFC47082 for ; Sat, 5 Jun 2021 21:34:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 027E061355 for ; Sat, 5 Jun 2021 21:34:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230075AbhFEVgR (ORCPT ); Sat, 5 Jun 2021 17:36:17 -0400 Received: from hosting.gsystem.sk ([212.5.213.30]:48694 "EHLO hosting.gsystem.sk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230010AbhFEVgQ (ORCPT ); Sat, 5 Jun 2021 17:36:16 -0400 Received: from [192.168.0.2] (188-167-68-178.dynamic.chello.sk [188.167.68.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by hosting.gsystem.sk (Postfix) with ESMTPSA id B0A8B7A00E6; Sat, 5 Jun 2021 23:34:26 +0200 (CEST) From: Ondrej Zary To: Ben Skeggs Subject: Re: nouveau broken on Riva TNT2 in 5.13.0-rc4: NULL pointer dereference in nouveau_bo_sync_for_device Date: Sat, 5 Jun 2021 23:34:23 +0200 User-Agent: KMail/1.9.10 Cc: dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org References: <202106052143.52488.linux@zary.sk> In-Reply-To: <202106052143.52488.linux@zary.sk> X-KMail-QuotePrefix: > MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <202106052334.23943.linux@zary.sk> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Saturday 05 June 2021 21:43:52 Ondrej Zary wrote: > Hello, > I'm testing 5.13.0-rc4 and nouveau crashes with NULL pointer dereference in nouveau_bo_sync_for_device. > Found various reports like this but that was back in februaryso that should be fixed now. So it is the same bug. Broken since 5.11. This revert fixes it in 5.11: https://lists.freedesktop.org/archives/dri-devel/2021-February/298531.html Added some debug printks to nouveau_bo_sync_for_device: [ 22.225048] ttm_dma=fc33b500 [ 22.225066] ttm_dma->num_pages=18 [ 22.225071] i=0 num_pages=16 [ 22.225077] ttm_dma->dma_address=00000000 [ 22.225094] BUG: kernel NULL pointer dereference, address: 00000000 So ttm->dma_address is NULL. -- Ondrej Zary