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 2DFA6C54EBD for ; Tue, 10 Jan 2023 02:25:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237876AbjAJCZm (ORCPT ); Mon, 9 Jan 2023 21:25:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53888 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237835AbjAJCZh (ORCPT ); Mon, 9 Jan 2023 21:25:37 -0500 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 A653513E34 for ; Mon, 9 Jan 2023 18:24:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673317487; 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=odciY+9+EikNajE585hIA5zUDol7M/v4VgDdpw0aLYY=; b=HVSSokT6hc5dGk+Q8ZOFuThkHGtZr+8Jgt31PDdATUG6CNI78ekzXh1BppySQE37RrL52Y gEjVy8u5Dhz9RIqLOxssFNjMGl08YDZaw2S6cC9Kp9zvntK4EjjXjGVt5KYSWaVpmUWsCD 7VxmkQ3HS0v7BOoy2dSGBRSNb0WIH2c= 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-104-RNpvsEVsPr-9Y50zhF9Krg-1; Mon, 09 Jan 2023 21:24:44 -0500 X-MC-Unique: RNpvsEVsPr-9Y50zhF9Krg-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 9AEE2811E9C; Tue, 10 Jan 2023 02:24:43 +0000 (UTC) Received: from localhost (ovpn-12-27.pek2.redhat.com [10.72.12.27]) by smtp.corp.redhat.com (Postfix) with ESMTPS id E0C1A175AD; Tue, 10 Jan 2023 02:24:42 +0000 (UTC) Date: Tue, 10 Jan 2023 10:24:39 +0800 From: Baoquan He To: Thomas Gleixner Cc: linux-kernel@vger.kernel.org, x86@kernel.org, kexec@lists.infradead.org Subject: Re: [PATCH] Revert "x86/apic/x2apic: Implement IPI shorthands support" Message-ID: References: <87k01vjrnt.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87k01vjrnt.ffs@tglx> X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 01/09/23 at 10:59pm, Thomas Gleixner wrote: > On Tue, Dec 20 2022 at 13:34, Baoquan He wrote: > > This reverts commit 43931d350f30c6cd8c2f498d54ef7d65750abc92. > > > > On kvm guest with 4 cpus deployed, when adding 'nr_cpus=2' to normal > > kernel's cmdline, and triggering crash to jump to kdump kernel, kdump > > kernel will stably hang. Reverting commit 43931d350f30 ("x86/apic/x2apic: > > Implement IPI shorthands support") can fix it. > > Is there any output on the early console or hangs it silently? > > If the latter, can you attach GDB to the guest and figure out where it > is stuck? No any output on the ealry console. I will try gdb debugging. Thanks.