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=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 03C5CC43219 for ; Thu, 2 May 2019 19:42:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 07E0D20651 for ; Thu, 2 May 2019 19:42:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="WR2z2Dg1" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726423AbfEBTmS (ORCPT ); Thu, 2 May 2019 15:42:18 -0400 Received: from mail-ed1-f68.google.com ([209.85.208.68]:44676 "EHLO mail-ed1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725962AbfEBTmR (ORCPT ); Thu, 2 May 2019 15:42:17 -0400 Received: by mail-ed1-f68.google.com with SMTP id b8so3182314edm.11 for ; Thu, 02 May 2019 12:42:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=smxA1EiAOM4O+e+0r4yKbO7u3umfCKvxARWKKLxNbAs=; b=WR2z2Dg1GwCmYak4J9AuuoWcQuVQmqMjWUu+Q54hC51oh46tx59Mezt76Twu6nyOx7 2XESGkaJ7es5OvX7Vie/S849j2NCYt1NokepSyOcg3e1lXUiuMsgqeKOwVLhEzPvBCIl jQ6RjVRxX2/OkIBALKfGUVaeCukWPniuFYRuQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=smxA1EiAOM4O+e+0r4yKbO7u3umfCKvxARWKKLxNbAs=; b=uhIQjwZj4sZw603UPr84KIFuj7h63rsNTcDSs91NoF2cSCsBcWhzh0dCFGZBo5BzrK GkegOeLXZe9NcREaEoUffbXh3nXkWdx4Nv6sbTF5atYQCW3mrpWvem6HMFKmluv1abvN fOayga/qatGHl2Mg5V/EJD6sAKrEcvXgPBVVMTWeoAYT7ShbhafRudhFkpu8/kc22iQT opkGABQ/YVAK5mt8h9jUGveoZ/b83VndpNARpgT4lfgz8vIV3wyvbs/dhI92OrFMBmoN Dz1TPnGOT/KL4+QwMjpFndfrQ1fcDC+Dhu7pIsMaV0pGWtzI8opMBdprUrKTjHTC74hr sGNQ== X-Gm-Message-State: APjAAAWM5+riaUOqEOoBuwWLwy8JTMDooNNKBhOayt5CAaiBczVGZMK2 +GSEOIIhlDjY1GlrtJK2HshbdnTyYdE= X-Google-Smtp-Source: APXvYqz01qHcgVvDUN8n2qr8p2sF8W0Dc4T/DUcNDX/kre6/3gWRWF6XI0ffJg/OfJ1Y4qUcg9Ju9Q== X-Received: by 2002:a50:a3dc:: with SMTP id t28mr3740043edb.256.1556826135961; Thu, 02 May 2019 12:42:15 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:569e:0:3106:d637:d723:e855]) by smtp.gmail.com with ESMTPSA id l43sm718924eda.70.2019.05.02.12.42.14 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 02 May 2019 12:42:14 -0700 (PDT) From: Daniel Vetter To: Intel Graphics Development Cc: LKML , Daniel Vetter , Daniel Vetter , Andrew Morton , Tetsuo Handa , Dmitry Vyukov , "Paul E. McKenney" , Valdis Kletnieks , Vitaly Kuznetsov , "Liu, Chuansheng" Subject: [PATCH 1/2] RFC: hung_task: taint kernel Date: Thu, 2 May 2019 21:42:07 +0200 Message-Id: <20190502194208.3535-1-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There's the hung_task_panic sysctl, but that's a bit an extreme measure. As a fallback taint at least the machine. Our CI uses this to decide when a reboot is necessary, plus to figure out whether the kernel is still happy. Signed-off-by: Daniel Vetter Cc: Andrew Morton Cc: Tetsuo Handa Cc: Dmitry Vyukov Cc: "Paul E. McKenney" Cc: Valdis Kletnieks Cc: Daniel Vetter Cc: Vitaly Kuznetsov Cc: "Liu, Chuansheng" --- kernel/hung_task.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/hung_task.c b/kernel/hung_task.c index f108a95882c6..7fae16f1b49c 100644 --- a/kernel/hung_task.c +++ b/kernel/hung_task.c @@ -203,6 +203,8 @@ static void check_hung_uninterruptible_tasks(unsigned long timeout) if (hung_task_call_panic) { trigger_all_cpu_backtrace(); panic("hung_task: blocked tasks"); + } else { + add_taint(TAINT_WARN, LOCKDEP_STILL_OK); } } -- 2.20.1