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=-3.8 required=3.0 tests=BAYES_00, 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 63236C2D0A3 for ; Wed, 4 Nov 2020 14:53:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1634F20759 for ; Wed, 4 Nov 2020 14:53:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728902AbgKDOxH (ORCPT ); Wed, 4 Nov 2020 09:53:07 -0500 Received: from depni-mx.sinp.msu.ru ([213.131.7.21]:25 "EHLO depni-mx.sinp.msu.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730208AbgKDOxG (ORCPT ); Wed, 4 Nov 2020 09:53:06 -0500 Received: from spider (unknown [176.192.246.239]) by depni-mx.sinp.msu.ru (Postfix) with ESMTPSA id 047391BF438; Wed, 4 Nov 2020 17:53:07 +0300 (MSK) From: Serge Belyshev To: Christophe Leroy Cc: Andreas Schwab , Paul Mackerras , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] powerpc/32s: Setup the early hash table at all time. References: <87wnz8vizm.fsf@igel.home> <87y2jouw8k.fsf@mpe.ellerman.id.au> <87v9esaxlv.fsf@igel.home> <20201030140047.Horde.TJJqKGzG9vSGbMRNIj-MPg7@messagerie.c-s.fr> <87pn4zc0zl.fsf@igel.home> <1f8494cd-36db-e3a2-8ea4-28fb976468e7@csgroup.eu> <875z6mmfna.fsf@depni.sinp.msu.ru> <5acd7caf-99e9-9cb5-ed24-578d2e0a5ee1@csgroup.eu> <871rh9mu4e.fsf@depni.sinp.msu.ru> <87wnz1lbce.fsf@depni.sinp.msu.ru> Date: Wed, 04 Nov 2020 17:53:01 +0300 In-Reply-To: <87wnz1lbce.fsf@depni.sinp.msu.ru> (Serge Belyshev's message of "Wed, 04 Nov 2020 12:28:49 +0300") Message-ID: <87pn4tkwc2.fsf@depni.sinp.msu.ru> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >>> To be sure we are not in front of a long lasting bug, could you try >>> CONFIG_KASAN=y on v5.9 ? >> >> Indeed it started to fail somewhere between v5.6 and v5.7. >> >> v5.7 fails early with few messages on the console with reboot, v5.8 and >> later hang right at bootloader. >> >> I'm bisecting now. > > (side note: I tried FB_OF=y instead of DRM_RADEON + DRM_FBDEV_* to speed > up bisection and it turns out in that configuration KASAN never worked, > down to commit 305d600123046, hanging right after bootloader or even > with invalid access in the bootloader itself). My bisection ended up nowhere (at net-next merge with 2k commits), and given the above failure with unrelated configuration change, I conclude that KASAN=y was always broken on this box.