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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 90BA9EB64DB for ; Thu, 15 Jun 2023 11:32:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343892AbjFOLcH (ORCPT ); Thu, 15 Jun 2023 07:32:07 -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 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