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,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED 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 20157C433E6 for ; Mon, 31 Aug 2020 06:21:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B41E820782 for ; Mon, 31 Aug 2020 06:21:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=preining.info header.i=@preining.info header.b="CUjtkTjr" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726252AbgHaGVe (ORCPT ); Mon, 31 Aug 2020 02:21:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54276 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725848AbgHaGVd (ORCPT ); Mon, 31 Aug 2020 02:21:33 -0400 X-Greylist: delayed 2554 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Sun, 30 Aug 2020 23:21:33 PDT Received: from hz.preining.info (hz.preining.info [IPv6:2a01:4f9:2a:1a08::2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 09307C061573 for ; Sun, 30 Aug 2020 23:21:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=preining.info; s=201909; h=Content-Type:MIME-Version:Message-ID:Subject:To: From:Date:Sender:Reply-To:Cc:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:In-Reply-To:References:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=/i95vzyfWpS6eCxBQWhb4V8bmrV6UbLhK0Eq9Uxe4OM=; b=CUjtkTjr56lAd3Jnu11rV053IH rstccilescML/nx6Sif9taajQcv4lCmPxMK2j+9IhiKGofm2XjLN3qIlbY1EJYFoSJL+Q1CNpxCEe pnRKdnPPmfr4Kbqs4sP5QRDUhJMSllZrQcaRJIoodlP5tqoDcJ0HD5j1UHRmygn12WubVYWGiMFn8 ZQpA4MSflVaOkqSZN71ujsoi4hK/tYlH2F2oAwEl+Txy9yqr6z0hHbvgHFErCEyqtqO9GfiQ0sSZN rQfwVRiX85ZnD5g8YuvcO4myXljy5jhYTWBMRGzogGna+FZ1NiH1fLtNWlUayn2Ih24NVmYKhsiFR C/PZjYKg==; Received: from tvk213002.tvk.ne.jp ([180.94.213.2] helo=bulldog.preining.info) by hz.preining.info with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kCcWp-0000v7-Sx for linux-kernel@vger.kernel.org; Mon, 31 Aug 2020 05:38:52 +0000 Received: by bulldog.preining.info (Postfix, from userid 1000) id C9797C3229A0; Mon, 31 Aug 2020 14:38:47 +0900 (JST) Date: Mon, 31 Aug 2020 14:38:47 +0900 From: Norbert Preining To: linux-kernel@vger.kernel.org Subject: kernel hard lockups wit 5.9-rc{2,3} Message-ID: <20200831053847.GA5022@bulldog.preining.info> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Dear all, (please Cc) I am seeing hard lockups with 5.9-rc2 and -rc3, while 5.8.N (1,2,3,4,5) work without any problems. THe lockups are hard to debug, since not even Sysrq works anymore. The screen freezes completely, no reaction. Ports are also dead, ssh into the machine is not possible. Hangs are repeatable, but not triggerable (at least I didn't find a way). Last time I left the screen locked and went shopping to find it locked up coming back. In total I got about 10 lock ups. This is an Intel CPU with AMD 5700xt GPU, running Debian/unstable. My feeling is somehow GPU related, but that might be a wide grasp. Any suggestions how to debug this? The kernel logs after reboot are empty. Best Norbert -- PREINING Norbert https://www.preining.info Accelia Inc. + IFMGA ProGuide + TU Wien + JAIST + TeX Live + Debian Dev GPG: 0x860CDC13 fp: F7D8 A928 26E3 16A1 9FA0 ACF0 6CAC A448 860C DC13