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 29FE7C43219 for ; Thu, 2 May 2019 20:46:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E83672081C for ; Thu, 2 May 2019 20:46:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="Utp9CJUE" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726324AbfEBUq5 (ORCPT ); Thu, 2 May 2019 16:46:57 -0400 Received: from mail-ed1-f68.google.com ([209.85.208.68]:34365 "EHLO mail-ed1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725962AbfEBUq5 (ORCPT ); Thu, 2 May 2019 16:46:57 -0400 Received: by mail-ed1-f68.google.com with SMTP id w35so1751526edd.1 for ; Thu, 02 May 2019 13:46:56 -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:in-reply-to:references :mime-version:content-transfer-encoding; bh=p0rauU0ja3fR+oPmh7A/vlojiO16XNZbGFS9RST2+60=; b=Utp9CJUEOxFtr55aE1nrugTYkmR0xU54dXkC5U0oON7vdFRxWfEyIOj9VFCpeFYS5W TPxZvq7NqjcuhVbT+S9giMAiCwiHpX11hJlu9muRTwai2Mg897JaDmQ2hdEasPjtICuz GEGloN60OTTMoA4FApUKQSfeW6pOtM1aOJo5M= 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=p0rauU0ja3fR+oPmh7A/vlojiO16XNZbGFS9RST2+60=; b=kcB9lyNVHw85TYqcVpRV0TN+sfayW5ZhJB4GrfuLS825DtmCIbDYXtdA+vTRwSQiyO OjYJxERYl1txETWiwEoVRVaw64ndcg5Bt+FRQrt83gHq1ZNoSBmcUB51uuGim4fSiO2o 41PFSRIZzyILa+BgwcrH+ImTb6BKTVAUeWe78SdYxQdiUwq1kyXJLbP3j3tcwJpRTXNL N2ngAFJ2MX1fy7N1R2G65MWqJm4pqAOhFxUy8kr8Rvood7Gn+6vWiNnt/qctqO+Bk+JU fyUB2JSWuhsIkIJ+D8L3elZtbvVR/pdEQ2i/zHFtpufcoUoYi5T9TrAgHlwFNm0n97h+ oXJw== X-Gm-Message-State: APjAAAXNWgcBNG8OwYBAymr/sDbyTXzZ0Cnp3UCPmsEImopPTd/gSeQe AGyj2rptLJP1GNYaBXjRxcg2Eg== X-Google-Smtp-Source: APXvYqz+fy7VdrUIGNccpP20f/DpOEh7Nto0S1P61xfQte4sjgmWCFXmQbZqnzrbJYH+M9hN6ahEig== X-Received: by 2002:a17:906:c50:: with SMTP id t16mr2927525ejf.296.1556830015518; Thu, 02 May 2019 13:46:55 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:569e:0:3106:d637:d723:e855]) by smtp.gmail.com with ESMTPSA id x30sm30594edd.74.2019.05.02.13.46.53 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 02 May 2019 13:46:54 -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] RFC: hung_task: taint kernel Date: Thu, 2 May 2019 22:46:48 +0200 Message-Id: <20190502204648.5537-1-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190502194208.3535-1-daniel.vetter@ffwll.ch> References: <20190502194208.3535-1-daniel.vetter@ffwll.ch> 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. v2: Works much better when I put the else { add_taint() } at the right place. 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..d90d98f53ccb 100644 --- a/kernel/hung_task.c +++ b/kernel/hung_task.c @@ -117,6 +117,8 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout) console_verbose(); hung_task_show_lock = true; hung_task_call_panic = true; + } else { + add_taint(TAINT_WARN, LOCKDEP_STILL_OK); } /* -- 2.20.1