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_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 BA7E4C433E1 for ; Sat, 11 Jul 2020 09:05:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9617D207BC for ; Sat, 11 Jul 2020 09:05:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="mzBzwQfK" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728235AbgGKJEe (ORCPT ); Sat, 11 Jul 2020 05:04:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45998 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728049AbgGKJEd (ORCPT ); Sat, 11 Jul 2020 05:04:33 -0400 Received: from mail-qk1-x72c.google.com (mail-qk1-x72c.google.com [IPv6:2607:f8b0:4864:20::72c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 61CBEC08C5DD for ; Sat, 11 Jul 2020 02:04:33 -0700 (PDT) Received: by mail-qk1-x72c.google.com with SMTP id 145so7657854qke.9 for ; Sat, 11 Jul 2020 02:04:33 -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=mzBzwQfKbQ+0l3wHrKZpuigz9kJD7VWYv11MPuCD/epGoZqxMWcuH0uflFFG9plncI Qq4z1m/qstikCTC8kHHqmplMY/UWHrKFwBbOBfVxJezjvEdMGJ13puS9QeHzRTO2pCzW qTs0I8GO8VFqerAeSP4Qvuno7QMjEZYV8UN7TEbgMJF8fRUn+hWehoyy/LiGIXM4f2l/ VxNUuJgjTPvfBm41Yb77qzhQuHWOcBaEZZlFWrXDawj1nIDIemGDgOybEiHVd0FkQtkq K2UD1c/nqNF2JuvDvIrFrTv5c6SCSxnerksJkxTSi/ARi7mHYWgSXG2h5vdU3Hf1cBCu mJ7g== 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=mXgE6nMHbhMImHW1TxjbPqzX/wd4DGZo3+RA9ZGe+BUGt+/iuoxNFuFilX+KcOiG8B z681vtM5KG4qlHwjbm3nUb1kpyqzVw/rmUZPazYLAp0rmDR2e/YL8u6SsLKqGC8Q0Yb+ DXFhQJBOgmejVRYklY/LiKlbmVTSat8bIW4Gj1bcBoO5X7Sm3eJMolj9Od3HRhW4l/Ny 8wZHQc002viVUrHquYNuKpMbH7T0orqxfisxYoMt+5D+jnbmUav2Sbk78ajDc2A8nM0z ifubL5ooCniXT9quY1fZbNsIxlmYk9wLinz7WOEMj/uNnUPHJLswnUSZz29MPXM6V9r6 Q/PQ== X-Gm-Message-State: AOAM533OD0UyJ7OYopT3+sKXE4pShcK+XgaEcL0zV+nFccIe/yE/oMC9 nrx5phoD6reQKE3Ti/eZVCFZhtUDLCK1MQ9p/THtqdCqsYdunQ== X-Google-Smtp-Source: ABdhPJyDeSl3T/JCihrSmsvi2fYVle5qBE7izdlboi/lxIR+hOFtgJ+LFejvAucyMo7hTN0neWTRfa1kxeOK4VSVU9s= X-Received: by 2002:a37:6382:: with SMTP id x124mr63325742qkb.13.1594458272346; Sat, 11 Jul 2020 02:04:32 -0700 (PDT) MIME-Version: 1.0 From: =?UTF-8?B?5a2Z5LiW6b6ZIHN1bnNoaWxvbmc=?= Date: Sat, 11 Jul 2020 17:04:21 +0800 Message-ID: Subject: What methods or tools could be used to investigate the causes of hard or soft lockup? To: LKML Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.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.