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=-2.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 8559DC4338F for ; Mon, 2 Aug 2021 17:17:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5F1FD61102 for ; Mon, 2 Aug 2021 17:17:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229914AbhHBRRQ (ORCPT ); Mon, 2 Aug 2021 13:17:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35032 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229710AbhHBRRP (ORCPT ); Mon, 2 Aug 2021 13:17:15 -0400 Received: from mail-oi1-x22b.google.com (mail-oi1-x22b.google.com [IPv6:2607:f8b0:4864:20::22b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6C6E1C06175F for ; Mon, 2 Aug 2021 10:17:04 -0700 (PDT) Received: by mail-oi1-x22b.google.com with SMTP id u10so24895621oiw.4 for ; Mon, 02 Aug 2021 10:17:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to:cc; bh=XNmEhCYcavH8lUjF07r3laSZ11ZJHK1QVVxu5abkP1M=; b=TAL5Vdu+3qZZCRpP6g1+EmXLtetQl+wHhdkwpxsT+/fxPP6sJMH1Op+C3Ogsp5Jvwe qo5HznHDkKYo/uMBDKRWYsMV2JEx/PER4p3xMmU7pgvErWbBbRcBsi0B0OcI+piKnJAG KXs4zksTeKoQX3tFmDMRfPh4eaIMSiC2Vh5KXBo9cqFWkENxcpUnMUEH92byjofJsHtB yPe+FUW3C5CJiUhH3t7QmNGFUtvGOLroKgr5aabx1se/421I9qvEo5rUC7FP1QsgyoUB 1DUNWij1xA4AbusIobhtWbBZXITS4zLM1f1SbUZ6PeOu+0zI0M6PKsRPbuaqtj+Gqzc1 4roA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=XNmEhCYcavH8lUjF07r3laSZ11ZJHK1QVVxu5abkP1M=; b=JaqMUu0cWBrE9kyF7FubRv032en/6APqx06hTV6vdLy4+KB/FMRVbyPg4A/dxP8WL8 bOPGfcaZ8TDkgSvCc7n3RW5XcY+oHmqh09PAHkBQ3n0EGCV3WrLZH/9bfQ7wRYacGgfd BT6OlQHQUFVzVwtIeqfw++kwREjd5K3v8mjS259LqFD6f8636fVM4T4nSGraQEfV0TCz 1/dy0+NZ7A7LyANsZ3UUffB5rTFJikSGhm4hbiWk53GbQ4/dwQ+rUXBGd+iesMGMb0bz lZAhmYHiRlNVpPzKBZa/K+nBmS0q4Vs9/ywTLFW3zXMtFC2XCQ9CkaoL0vzFB1VdVD9d OMBw== X-Gm-Message-State: AOAM5312YSWHqJ4twlhdXY05uDl995sDEQuniQNHnIRn4rX4ovIINzwm IgvDMvVwk7YjVSjqJNMK1jaePgJrVoNnrxQkH3CyX2gHonSoeA== X-Google-Smtp-Source: ABdhPJz0ojc6DeWSvEDLNdpEWqUoNSiP9Bq90/S4qeCahoGj+1KUQMcRa6S+Ji4G5PJDkMs0LeWCBpPJw/xdRUnR3Lc= X-Received: by 2002:a05:6808:1304:: with SMTP id y4mr11638385oiv.40.1627924623710; Mon, 02 Aug 2021 10:17:03 -0700 (PDT) MIME-Version: 1.0 From: Mikael Pettersson Date: Mon, 2 Aug 2021 19:16:52 +0200 Message-ID: Subject: [BISECTED] 5.14.0-rc4 broke drm/ttm when !CONFIG_DEBUG_FS To: Linux Kernel list Cc: dri-devel@lists.freedesktop.org, Jason Ekstrand , Daniel Vetter Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Booting 5.14.0-rc4 on my box with Radeon graphics breaks with [drm:radeon_ttm_init [radeon]] *ERROR* failed initializing buffer object driver(-19). radeon 0000:01:00.0: Fatal error during GPU init after which the screen goes black for the rest of kernel boot and early user-space init. Once the console login shows up the screen is in some legacy low-res mode and Xorg can't be started. A git bisect between v5.14-rc3 (good) and v5.14-rc4 (bad) identified # first bad commit: [69de4421bb4c103ef42a32bafc596e23918c106f] drm/ttm: Initialize debugfs from ttm_global_init() Reverting that from 5.14.0-rc4 gives me a working kernel again. Note that I have # CONFIG_DEBUG_FS is not set /Mikael