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 264B6EB64D8 for ; Wed, 14 Jun 2023 12:43:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244682AbjFNMnf (ORCPT ); Wed, 14 Jun 2023 08:43:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45468 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244679AbjFNMnd (ORCPT ); Wed, 14 Jun 2023 08:43:33 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B0EDE1FD0 for ; Wed, 14 Jun 2023 05:42:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1686746570; 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=9rwzafrtb8gDRrfEzvCs2Q+IJeJr2kEPYUkrYvfKXws=; b=Y7YcLapQ2UZOuwxMbWCMtb/gp0IhUrKbMUZYp+TizssVknbaLkKBKqsj8bjCufkwU8G4yE gITrN2uDE8nIvA4niofF+oNvNIHZSPdV9sfbAjDI2I26Eaigz9rqu1D9cZkHoPG8L7ULTO IBMsHxoXj8ISsuZ0rjMPQ9PVs/NHiuE= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-507-zvZHiDYCOIC3lL2kJOp_0A-1; Wed, 14 Jun 2023 08:42:46 -0400 X-MC-Unique: zvZHiDYCOIC3lL2kJOp_0A-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 8100480006E; Wed, 14 Jun 2023 12:37:46 +0000 (UTC) Received: from localhost (unknown [10.39.192.206]) by smtp.corp.redhat.com (Postfix) with ESMTP id 33304140E951; Wed, 14 Jun 2023 12:37:46 +0000 (UTC) Date: Wed, 14 Jun 2023 13:37:45 +0100 From: "Richard W.M. Jones" To: Peter Zijlstra Cc: Aaron Thompson , linux-kernel@vger.kernel.org Subject: Re: printk.time causes rare kernel boot hangs Message-ID: <20230614123745.GE7636@redhat.com> References: <20230613134105.GA10301@redhat.com> <20230614092158.GF1639749@hirez.programming.kicks-ass.net> <20230614094522.GA7636@redhat.com> <20230614103011.GL7912@redhat.com> <20230614103953.GM7912@redhat.com> <20230614113536.GJ1639749@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230614113536.GJ1639749@hirez.programming.kicks-ass.net> User-Agent: Mutt/1.5.21 (2010-09-15) X-Scanned-By: MIMEDefang 3.1 on 10.11.54.7 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jun 14, 2023 at 01:35:36PM +0200, Peter Zijlstra wrote: > I've got that plain qemu thing running on: > > defconfig + kvm_guest.config + CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y With this config I hit the bug locally after ~ 400 iterations. However this is on an AMD host, and for some reason on Intel host the bug is rarer (although it still happens). Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-p2v converts physical machines to virtual machines. Boot with a live CD or over the network (PXE) and turn machines into KVM guests. http://libguestfs.org/virt-v2v