Received: by 2002:a05:6358:3188:b0:123:57c1:9b43 with SMTP id q8csp971635rwd; Thu, 15 Jun 2023 04:51:44 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ6q2TRVWVLq4bbEHH8w59JJsWUn2Jn09PSGVzmO11DfPjQMMIuXHiTa0tzkoKToqSTaIe0C X-Received: by 2002:a17:903:44a:b0:1b3:dbb1:757 with SMTP id iw10-20020a170903044a00b001b3dbb10757mr8580027plb.47.1686829904196; Thu, 15 Jun 2023 04:51:44 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1686829904; cv=none; d=google.com; s=arc-20160816; b=FeGkoRLvcMhz4LZwsQh9tAXlspfKvjU7/kz0kWNwrfEZCWVSJ0XEP0DCEZyblzsXpM EEJuDRBUn+4vHhGQSigRcKSQMEIOCeQPkBMjfzVI0atsVjObV8j18vJTtyKtde3RDJLq ir31icHq3SbkOfryEBO/eB0dMmnuroS/h9fzZMLEu4xs9lZYCkAFmd7wcfPjANjpFPkf kadXA9M+MJF7zQlONmvcJCGgc3TE+U5pXT7EN64FmWD25EpFoTzhA1f/Xf/pw90NQppn uu69oBOQhjVD+D+2+lkOfyypm71uOqJZmeoaNe8iV7DiBf/ciwPfZTkXiGf5HkbCP+/7 zVsQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:user-agent:in-reply-to:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :dkim-signature; bh=+/XZCNt/QvdEXWrMsWxLzKd1tiPDtWpqCSu6u7Jtfw0=; b=gpMzwE4BqzbiXI5wrLzTC1BRG8oUUf8Bb0j/RBa7/HYWKqq3HKFPsZPjaslXjgV0+t B8Ijg//9G7qoXOG+TzYOEYNxVQtUQ75CETNZ1wbjPxy8YwwNJj+GXqZVUWmRVd0vrKwW Js4Og/zoMgOc1MxhMP6a7ITShHwvjq448kefQzXAmdj0IREO31sLGo/gALWdRXMP7BbF XGw4t49WcpBxvWXub1a8cfcP6089v3M1wnP0sU4XWvXsXKLob+VB8Qj6PndSBY6chMR9 iGS5MInPtMrtoy7Rvd096EEMDFMuCPbsbJuX+eSVzE9IgSbOOAsxjseSjn6ugEiRAVuz l0vg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=VKNOt+pm; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Return-Path: Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id kj15-20020a17090306cf00b001b3bd85f54bsi1344457plb.35.2023.06.15.04.51.30; Thu, 15 Jun 2023 04:51:44 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=VKNOt+pm; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343876AbjFOLcG (ORCPT + 99 others); Thu, 15 Jun 2023 07:32:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49456 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343847AbjFOLb5 (ORCPT ); Thu, 15 Jun 2023 07:31:57 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B1DE72695 for ; Thu, 15 Jun 2023 04:31:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1686828672; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=+/XZCNt/QvdEXWrMsWxLzKd1tiPDtWpqCSu6u7Jtfw0=; b=VKNOt+pm+R5gS8sg+hnWbP9NgMOW/CbnjY1AIYUTbnsOETmwxwjsmWLZZcKfVnyeg2uy6u 0SyCb4r2jWxTzT4QvxyvpcOrvyPfqfC/3ZHtZ0wQNg9GQex28Zl53G9KeoOh8vaErbqS+3 V7F7STqW6JRlcUGgOEjNQLqTOhYdxOg= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-120-mw6PUxiEPKCWYbYzKeOZpw-1; Thu, 15 Jun 2023 07:31:09 -0400 X-MC-Unique: mw6PUxiEPKCWYbYzKeOZpw-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 0E0453C01C1B; Thu, 15 Jun 2023 11:31:09 +0000 (UTC) Received: from localhost (unknown [10.39.192.206]) by smtp.corp.redhat.com (Postfix) with ESMTP id C6F71492C1B; Thu, 15 Jun 2023 11:31:08 +0000 (UTC) Date: Thu, 15 Jun 2023 12:31:08 +0100 From: "Richard W.M. Jones" To: YiFei Zhu Cc: dev@aaront.org, linux-kernel@vger.kernel.org, peterz@infradead.org, zhuyifei1999@gmail.com Subject: Re: printk.time causes rare kernel boot hangs Message-ID: <20230615113108.GN7636@redhat.com> References: <20230614112625.GN7912@redhat.com> <20230615110429.2839058-1-zhuyifei@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230615110429.2839058-1-zhuyifei@google.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-Scanned-By: MIMEDefang 3.1 on 10.11.54.10 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jun 15, 2023 at 11:04:29AM +0000, YiFei Zhu wrote: > see if you can send a alt-sysrq-w to show stacks of > blocked tasks. I guess this is a virtual console thing? I have to boot this hundreds of times with a serial console to even get to the bug, so it's tricky. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-builder quickly builds VMs from scratch http://libguestfs.org/virt-builder.1.html