From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752517AbdHJMBI (ORCPT ); Thu, 10 Aug 2017 08:01:08 -0400 Received: from mx1.redhat.com ([209.132.183.28]:50378 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752016AbdHJMBH (ORCPT ); Thu, 10 Aug 2017 08:01:07 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com D2F652C976B Authentication-Results: ext-mx05.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx05.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=vkuznets@redhat.com From: Vitaly Kuznetsov To: x86@kernel.org Cc: linux-kernel@vger.kernel.org, Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" Subject: Re: [PATCH RESEND] x86/smpboot: Unbreak CPU0 hotplug References: <20170803105818.9934-1-vkuznets@redhat.com> Date: Thu, 10 Aug 2017 14:01:03 +0200 In-Reply-To: <20170803105818.9934-1-vkuznets@redhat.com> (Vitaly Kuznetsov's message of "Thu, 3 Aug 2017 12:58:18 +0200") Message-ID: <87fucztyww.fsf@vitty.brq.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Thu, 10 Aug 2017 12:01:07 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Vitaly Kuznetsov writes: > A hang on CPU0 onlining after a preceding offlining is observed. Trace > shows that CPU0 is stuck in check_tsc_sync_target() waiting for source > CPU to run check_tsc_sync_source() but this never happens. Source CPU, > in its turn, is stuck on synchronize_sched() which is called from > native_cpu_up() -> do_boot_cpu() -> unregister_nmi_handler(). > > Fix the issue by moving unregister_nmi_handler() from do_boot_cpu() to > native_cpu_up() after cpu onlining is done. > > Signed-off-by: Vitaly Kuznetsov > --- > It's been awile since my v1 submission, no comments so far. Resending. Sorry, but ping? I haven't received a single comment on this since the initial submission on June, 26 - is it so bad? :-) -- Vitaly