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 DF304EB64DA for ; Wed, 14 Jun 2023 10:41:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238643AbjFNKlE (ORCPT ); Wed, 14 Jun 2023 06:41:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49234 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233227AbjFNKkw (ORCPT ); Wed, 14 Jun 2023 06:40:52 -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 2A48F19A7 for ; Wed, 14 Jun 2023 03:39:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1686739198; 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=VdQRhZdiHtCtPuk3jcY9yeSSGCLFQVBToLeZ7VJRZG8=; b=eAvxLHzG0F17dl02ncZGg0Y11IOI2NY+uYjh1kWBz6lkykwJTwWDg4PF7qUdosUbUw8aLd GmvFzWRdI5epoHTul6/JuTK+X3GHeTpuEU7jl5ExSUDVppxRqO+3GL6NunbGtbValxuenT ZGRHg1/MKtrLb3DRo7vu1uhYNZp8DXY= 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-43-1WU7cfJUNAq9qhml-yjJ3Q-1; Wed, 14 Jun 2023 06:39:55 -0400 X-MC-Unique: 1WU7cfJUNAq9qhml-yjJ3Q-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id A128D38123A0; Wed, 14 Jun 2023 10:39:54 +0000 (UTC) Received: from localhost (unknown [10.39.192.206]) by smtp.corp.redhat.com (Postfix) with ESMTP id 66A749E9C; Wed, 14 Jun 2023 10:39:54 +0000 (UTC) Date: Wed, 14 Jun 2023 11:39:53 +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: <20230614103953.GM7912@redhat.com> References: <20230613134105.GA10301@redhat.com> <20230614092158.GF1639749@hirez.programming.kicks-ass.net> <20230614094522.GA7636@redhat.com> <20230614103011.GL7912@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230614103011.GL7912@redhat.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Got it! #0 arch_static_branch (branch=false, key=) at ./arch/x86/include/asm/jump_label.h:27 #1 static_key_false (key=) at ./include/linux/jump_label.h:207 #2 native_write_msr (msr=1760, low=1876580734, high=106) at ./arch/x86/include/asm/msr.h:147 #3 0xffffffff8107997c in paravirt_write_msr (high=, low=1876580734, msr=1760) at ./arch/x86/include/asm/paravirt.h:196 #4 wrmsrl (val=, msr=1760) at ./arch/x86/include/asm/paravirt.h:229 #5 lapic_next_deadline (delta=, evt=) at arch/x86/kernel/apic/apic.c:491 #6 0xffffffff811f7b1d in clockevents_program_event (dev=0xffff88804e820dc0, expires=, force=) at kernel/time/clockevents.c:334 #7 0xffffffff811f81b0 in tick_handle_periodic (dev=0xffff88804e820dc0) at kernel/time/tick-common.c:133 #8 0xffffffff810796c1 in local_apic_timer_interrupt () at arch/x86/kernel/apic/apic.c:1095 #9 __sysvec_apic_timer_interrupt (regs=regs@entry=0xffffc90000003ee8) at arch/x86/kernel/apic/apic.c:1112 #10 0xffffffff81f9cf09 in sysvec_apic_timer_interrupt (regs=0xffffc90000003ee8) at arch/x86/kernel/apic/apic.c:1106 #11 0xffffffff820015ca in asm_sysvec_apic_timer_interrupt () at ./arch/x86/include/asm/idtentry.h:645 #12 0x0000000000000000 in ?? () There's only 1 vCPU in the VM. However earlier I did try with -smp 2 and that also has the same issue. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://libguestfs.org