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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 873B4C433FE for ; Wed, 5 Jan 2022 09:40:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234234AbiAEJkv (ORCPT ); Wed, 5 Jan 2022 04:40:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60908 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229645AbiAEJku (ORCPT ); Wed, 5 Jan 2022 04:40:50 -0500 Received: from mail-ua1-x932.google.com (mail-ua1-x932.google.com [IPv6:2607:f8b0:4864:20::932]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 70EB0C061761; Wed, 5 Jan 2022 01:40:50 -0800 (PST) Received: by mail-ua1-x932.google.com with SMTP id c36so42429485uae.13; Wed, 05 Jan 2022 01:40:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=Z1JabUfioaXQzQJ9cyfx4bPbapY2g1hoPELFMnBeqJw=; b=G7N8XSF+kA5XWE1zgOstxJvehCpGUEZNO5dt96BFGSWnakr+tcAYbKh6C3hs4GOoyu Yhdo0/6j6EYnE6dWUYfN/foAc9o8Q/mFEQfELPEUn5M6/EN3NpmtBRob4BSPydMEuRft Zuc7xVhZy4hy7KQ71MDbvq/60q09Ls8n0//sM5h1yHR/pBVN6qClzOOBNMpjVEhFZket sD6tucMhDg3NDunnoqvq3/iIVSCs4pTVBnCmgDHEMAmnJwiDQrnAOwNE1jrUQCiwEsTm 4KVfwV+NoZRomdBuTDEwlm1qHrQgLLWvi5GukJG7u/1phHUErZGVIonPrgrevkuZjk0x +ETA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=Z1JabUfioaXQzQJ9cyfx4bPbapY2g1hoPELFMnBeqJw=; b=OReKEHzxdRHZ4my4+lUuaIRK/UgtTurJCM7GfvxnGs08UQwQpW3YL1K5PzLaD5ci/2 bSiczkSWDpmxQnPY0IAjZn8YLIou/sEDVoBH8c0ar+6EIFArx55E5hb2ShfuQCoJMTv/ CzMDgHCqAGR4gcbGg+lZqkvaa0bf5DVaMGdgFJju3X22XfQKTjWzlBz/0CU/KMzE+iwi KMfUAlan1l7RtWbQoa1nuQHJOL9XH0vOt4aVqAmodWoTYeOgbZrV/Cuc33v7rpfTMmXM 8QWE13ufNvUfTWfQ5EBmj45SwgEeGAoIiSGzTkxTMJ7C637vPKOCaymTrdS4R5rMeqWA /3IA== X-Gm-Message-State: AOAM533q4x352/CsVh48CSvan0zzdyLKe85qf7tb2oMNQ2QkduOYM6KX M8J44EFh1eCU7FyB0gaXixCyUxlAU3Eb8zH1rJH+u7F/S1E= X-Google-Smtp-Source: ABdhPJwHDpzSWJ/HD9aDpmk46Nd2vRr9D/1sJ/QYCx0rcjjI2aiEOYE0Fh+nDGNm45mVSwWAf7u5ojdUjsBROja5WTw= X-Received: by 2002:a05:6102:ec2:: with SMTP id m2mr17000808vst.6.1641375649657; Wed, 05 Jan 2022 01:40:49 -0800 (PST) MIME-Version: 1.0 References: <20211013063656.3084555-1-chenhuacai@loongson.cn> <722477bcc461238f96c3b038b2e3379ee49efdac.camel@mengyan1223.wang> <587ab54d77af2fb4cdbe0530cdd5e550c3e968db.camel@mengyan1223.wang> In-Reply-To: <587ab54d77af2fb4cdbe0530cdd5e550c3e968db.camel@mengyan1223.wang> From: Huacai Chen Date: Wed, 5 Jan 2022 17:40:49 +0800 Message-ID: Subject: Re: [PATCH V5 00/22] arch: Add basic LoongArch support To: Xi Ruoyao Cc: Huacai Chen , Arnd Bergmann , Andy Lutomirski , Thomas Gleixner , Peter Zijlstra , Andrew Morton , David Airlie , Jonathan Corbet , Linus Torvalds , linux-arch , "open list:DOCUMENTATION" , LKML , Xuefeng Li , Yanteng Si , Jiaxun Yang Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Ruoyao, The problem still exists in 5.16-rc8, can you try to change cpu_relax() definition to smp_mb()? It seems can fix the problem. Huacai On Tue, Dec 28, 2021 at 4:34 PM Xi Ruoyao wrote: > > On Tue, 2021-12-21 at 15:53 +0800, Huacai Chen wrote: > > > On Mon, Dec 20, 2021 at 5:04 PM Xi Ruoyao > > wrote: > > > > > > The snapshot panics on my system under high pressure (building and > > > testing GCC). The panic message is pasted, but it's kind of broken up > > > likely because multiple CPU cores were outputing to the serial console > > > simutaniously. > > > > > > The config is attached. I'm not sure the reason of the panic (bug in > > > the patches or bug in mainline kernel?) Do you have some pointers to > > > diagnostic and fix the issue? > > > > > > [ 5391.004745] CPU 1 Unable to handle kernel paging request at virtual address 000000000040007e, era == 90000000003aa07c, ra == 90000000003aa84c > > /* snip */ > > > We also found that the latest github kernel has some stable issues, > > and we are investigating. > > I rebased the patches onto 438645193e59e91761ccb3fa55f6ce70b615ff93 and > the problem *seems* gone. Not sure if it's something fixed in the > mainline or some more strange thing. > -- > Xi Ruoyao > School of Aerospace Science and Technology, Xidian University