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=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 3264FC32750 for ; Tue, 13 Aug 2019 04:43:49 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 65AFD2063F for ; Tue, 13 Aug 2019 04:43:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=c-s.fr header.i=@c-s.fr header.b="MJUg8Qcq" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 65AFD2063F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=c-s.fr Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 4670Tt3FhwzDqWW for ; Tue, 13 Aug 2019 14:43:46 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=c-s.fr (client-ip=93.17.236.30; helo=pegase1.c-s.fr; envelope-from=christophe.leroy@c-s.fr; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=c-s.fr Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=c-s.fr header.i=@c-s.fr header.b="MJUg8Qcq"; dkim-atps=neutral Received: from pegase1.c-s.fr (pegase1.c-s.fr [93.17.236.30]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4670RL333yzDqQj for ; Tue, 13 Aug 2019 14:41:33 +1000 (AEST) Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 4670RC2FPQz9v1VL; Tue, 13 Aug 2019 06:41:27 +0200 (CEST) Authentication-Results: localhost; dkim=pass reason="1024-bit key; insecure key" header.d=c-s.fr header.i=@c-s.fr header.b=MJUg8Qcq; dkim-adsp=pass; dkim-atps=neutral X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id OYZtCG8COW2R; Tue, 13 Aug 2019 06:41:27 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 4670RC0xVpz9v1SR; Tue, 13 Aug 2019 06:41:27 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1565671287; bh=mFjr2W6KC5v33j9Skz0AXA+ozawGYVEx6VDe5ntf+O8=; h=Subject:To:References:From:Date:In-Reply-To:From; b=MJUg8QcqtgZ9cJ9o2qzYPijV1PUjPCSlcGs/MNNWcjtzTqBJfacu3NAMosXPdzZU+ aNIkfB9QryR1lXiaphxAjvDtth2yGRzKt4ewwsxtrXvL/stm23/EmvEYlWNul7nT4O XLxs0N7N++xJ4lZIW3eVvmZVIwG1vI6YlbPrfqtE= Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id EF2268B79D; Tue, 13 Aug 2019 06:41:27 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id 6tIsM8rWN2WH; Tue, 13 Aug 2019 06:41:27 +0200 (CEST) Received: from [192.168.4.90] (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id C108C8B79A; Tue, 13 Aug 2019 06:41:27 +0200 (CEST) Subject: Re: Freeze on ppc32 MPC8248 board with 5.2 kernel To: Doug Crawford , linuxppc-dev@lists.ozlabs.org References: From: Christophe Leroy Message-ID: Date: Tue, 13 Aug 2019 06:41:27 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Hi Doug, Le 26/07/2019 à 00:30, Doug Crawford a écrit : > We have a ppc32 MPC8248 board that is working perfectly with the 4.19 > kernel. > We have noticed two issues with the 5.2 kernel: Have you tried 5.0 and 5.1 ? > > 1) If the new CONFIG_PPC_KUAP (kernel userspace access protection) is > enabled the kernel freezes right after initializing all the drivers and > just before starting /sbin/init. Can you provide your .config ? Can you also provide the output of the boot console ? > > 2) If CONFIG_PPC_KUAP is disabled the system starts up, but any user > space program will hang indefinitely after calling the GCC atomic > "__sync_bool_compare_and_swap".  This happens when nginx starts.  The > same nginx binary works fine on a 4.19 kernel. Can you provide 'dmesg' ? What version of GCC do you use ? Have you tried a simple program doing nothing else than __sync_bool_compare_and_swap() ? Can you provide a disassembly of the function that uses __sync_bool_compare_and_swap() ? Thanks Christophe