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=-3.5 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 C4D92C433E0 for ; Sat, 11 Jul 2020 09:04:36 +0000 (UTC) Received: from shelob.surriel.com (shelob.surriel.com [96.67.55.147]) (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 664AF2077D for ; Sat, 11 Jul 2020 09:04:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="jNkT6TZ5" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 664AF2077D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernelnewbies-bounces@kernelnewbies.org Received: from localhost ([::1] helo=shelob.surriel.com) by shelob.surriel.com with esmtp (Exim 4.94) (envelope-from ) id 1juBPl-0004wP-6f; Sat, 11 Jul 2020 05:03:21 -0400 Received: from mail-qk1-x72b.google.com ([2607:f8b0:4864:20::72b]) by shelob.surriel.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.94) (envelope-from ) id 1juBPf-0004vq-PO for Kernelnewbies@kernelnewbies.org; Sat, 11 Jul 2020 05:03:15 -0400 Received: by mail-qk1-x72b.google.com with SMTP id b4so7640867qkn.11 for ; Sat, 11 Jul 2020 02:03:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=l8cMBox5B81kKC1/vqo4Blm6vKckzlIDGhm+yeOYrPA=; b=jNkT6TZ54taNR5F0TARSvxpOmZbi8Pe1kCTcWlAZXyfrPSpwS5KwTdA50oH0z0v+j9 Asa+Uj43j/rcGSXfJBqhubFHmS5ZiR9c/slenBEue3JR2TbuLhn0RDdy9sAcjvRiney6 9kYTCRQ/miT8pYfnjdoQHRyY3qJOEZTcGMozbG1hrO77K9giP/naZS//EmNu92DDBwuu ae2Mcj2yoDtB5HF0HLD+uEopkiGmBQllLlAHqzA5ggZvnucdntbddRNcQA0Tpe7UB6v/ kJ9sQGt3u1Bhs6zA3WUSbnoi6uAjQKUNftvDXC7kiFxE1B8Z4iUsw6F3HCJjG8SRYwRb X60w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=l8cMBox5B81kKC1/vqo4Blm6vKckzlIDGhm+yeOYrPA=; b=o1tUQm6fGfB/tau67ZKbwqZRan6tfiCU+HzIZa5soCA4xBMgiNENN02fQb72Y2bqAN LYe4fxUr+huFzwHe5v2rR7X2vF5YQtm1xPagbRvRgL0JSExTN73G7HH1VUF4yQzzwKOG bAIbZC4G4t3IVs6pLxWfwqcsUTf7Ag5rt/hxN1B+lIhL9lWw7EjKbobfS0lqNN4pJQ7n qZHlIUjC+OVZ+KwhtYgYWFHcVwTcCf/+XDGZ4weRjg2nVgjQznf7Dx4KnAIzK/61CXWf XT4D4w2ZkNVavSzqpHssZFuWXiLwTKZy8+CTymxdwsT4VaAb+X2IoAoEUv69UsiUueuT 5VJQ== X-Gm-Message-State: AOAM5337Mbw2ETbl/KJpfhTHnzFVvDBdz8jinx4Oi7EnveZaUR24e070 j439GVD8QO4JSo2pHsfw5PYZPTreJWVv6bIG/hBvlO9e0jzlmA== X-Google-Smtp-Source: ABdhPJx5ndV/pUtw1MrYrLQ3lZaKsJl2D9w67vSm4OeUaUwhnR1c16ji5rxWM6JI7E1m/H3DzMtfckRps2hxNlB4/VM= X-Received: by 2002:a05:620a:1010:: with SMTP id z16mr69638370qkj.125.1594458132878; Sat, 11 Jul 2020 02:02:12 -0700 (PDT) MIME-Version: 1.0 From: =?UTF-8?B?5a2Z5LiW6b6ZIHN1bnNoaWxvbmc=?= Date: Sat, 11 Jul 2020 17:02:01 +0800 Message-ID: Subject: What methods or tools could be used to investigate the causes of hard or soft lockup? To: kernelnewbies X-BeenThere: kernelnewbies@kernelnewbies.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Learn about the Linux kernel List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kernelnewbies-bounces@kernelnewbies.org Hi, list I have frequently faced sort lockups and hard lockups. Here are some example logs: 1. Watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [cantest:1669] 2. NMI watchdog: Watchdog detected hard LOCKUP on CPU 0 What methods or tools could be used to investigate the causes of hard or soft lockups? I have been stuck with such problems for a long time. I would be grateful if somebody shed some light on this issue. Any advice on how to proceed? Thank you for your attention to this matter. Best regards. _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies