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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 45A31C3DA78 for ; Tue, 17 Jan 2023 08:27:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=yPyPVHFxpRbR+scH8lUdTWFEVIAyFnTUM82FGyvZe2A=; b=eJ2HNMsXf7KfJu AHScuqDCimAnH7jI+vXmMVIXJp4xZGHCjVXuzA7tjcfUf+nnzM2ClEDML1Gp+XJQHRwxRU1e2qysl eS1VIxyqWdEzDn9yZSBwVNSIzpHqrskaQZ0ASw4ZlCvBrB/csJ/JB//xnUGDY3V1IJcquCwawSnGN 8w/5ay5EPMz7GHCP23/Zap9fyI2lDOieRu/G9d1fptP2QfLIrZmg4qT4vbUf1f/4bk5yWp+syCvKW 8pJIQMxZgWxgo71tIZHCnE4R8t+lh9L5TNEUmMzGTFxgrS2EZuEpksBc4wYUDk7D0HdsZQkGJH+o9 bFc7gZh0xDfbKTF2O/NA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pHhJg-00DJr7-8i; Tue, 17 Jan 2023 08:27:36 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pHhJd-00DJq5-Fx for kexec@lists.infradead.org; Tue, 17 Jan 2023 08:27:34 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673944052; 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=gg7qkv1C1Ou83J3gkN1LzeHJIr1iBZFQETY1qPldk9s=; b=fJZPnmMPOWTWwKtqO1CsaxfxQGLs1e0TOzo/7C2Nc7hJ994O/P/apAM1C7ITg1MIdRelkr bjqzUHC8uLaqRbOJORLwrBcA2FieEVC2QFRd1wGpxMvOGz3DWrnNCppLYdLHVIJXuG+mAy i7kSSIuJNg5BqhxqIqNIEIkofNgwqD0= 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-270-nESQqZ6lMb2BsRB0SL1EKg-1; Tue, 17 Jan 2023 03:27:28 -0500 X-MC-Unique: nESQqZ6lMb2BsRB0SL1EKg-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 7D6D2858F09; Tue, 17 Jan 2023 08:27:28 +0000 (UTC) Received: from localhost (ovpn-12-229.pek2.redhat.com [10.72.12.229]) by smtp.corp.redhat.com (Postfix) with ESMTPS id A5173C15BA0; Tue, 17 Jan 2023 08:27:27 +0000 (UTC) Date: Tue, 17 Jan 2023 16:27:23 +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-Disposition: inline In-Reply-To: X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230117_002733_623616_99BF363D X-CRM114-Status: GOOD ( 17.99 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org On 01/10/23 at 10:24am, Baoquan He wrote: > 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. I rebase to the latest upstream kernel and tested, the stable kdump kernel hang disappear. Seems I need do another round of bisect to see on which commit it's made to fix that. Will update if any progress. _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec