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 X-Spam-Level: X-Spam-Status: No, score=-0.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D39F4C43143 for ; Mon, 1 Oct 2018 09:13:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 85B952064A for ; Mon, 1 Oct 2018 09:13:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazon.de header.i=@amazon.de header.b="A4SFddLg" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 85B952064A Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=amazon.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728998AbeJAPuk (ORCPT ); Mon, 1 Oct 2018 11:50:40 -0400 Received: from smtp-fw-6002.amazon.com ([52.95.49.90]:48589 "EHLO smtp-fw-6002.amazon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728808AbeJAPuk (ORCPT ); Mon, 1 Oct 2018 11:50:40 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.de; i=@amazon.de; q=dns/txt; s=amazon201209; t=1538385232; x=1569921232; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=Xsb66IXfjvstWgU8UpLP0lVkeCd4GB8jEyXXXSj1Uco=; b=A4SFddLgHGg/hp7D7ZJfaDRfVtEC0RkpjVyFvQgt6HZvTunxlKdOC1BD QdL9FPhsBkE4VSW7GdDeGuHn+1V7vHH3pu8NrXS8e1EiiIUXYnHyhcAjs JiCN3kwECns82l3xhcHkktULAi7DBA2vX//mdBDyMK3j0DRvN8ZBAlKp1 0=; X-IronPort-AV: E=Sophos;i="5.54,327,1534809600"; d="scan'208";a="365046694" Received: from iad6-co-svc-p1-lb1-vlan3.amazon.com (HELO email-inbound-relay-1a-67b371d8.us-east-1.amazon.com) ([10.124.125.6]) by smtp-border-fw-out-6002.iad6.amazon.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 01 Oct 2018 09:13:50 +0000 Received: from u7588a65da6b65f.ant.amazon.com (iad7-ws-svc-lb50-vlan3.amazon.com [10.0.93.214]) by email-inbound-relay-1a-67b371d8.us-east-1.amazon.com (8.14.7/8.14.7) with ESMTP id w919Dl7O040816 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL); Mon, 1 Oct 2018 09:13:49 GMT Received: from u7588a65da6b65f.ant.amazon.com (localhost [127.0.0.1]) by u7588a65da6b65f.ant.amazon.com (8.15.2/8.15.2/Debian-3) with ESMTP id w919DkM7026727; Mon, 1 Oct 2018 11:13:46 +0200 Subject: Re: [RFC 61/60] cosched: Accumulated fixes and improvements To: Nishanth Aravamudan Cc: Ingo Molnar , Peter Zijlstra , linux-kernel@vger.kernel.org References: <20180907214047.26914-1-jschoenh@amazon.de> <20180913191938.30526-1-jschoenh@amazon.de> <20180926172519.GA23535@breakout> <20180926210551.GA28790@breakout> From: "=?UTF-8?Q?Jan_H._Sch=c3=b6nherr?=" Openpgp: preference=signencrypt Message-ID: <13d56369-bdcc-9633-ecc0-659efadcd2a4@amazon.de> Date: Mon, 1 Oct 2018 11:13:46 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20180926210551.GA28790@breakout> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/26/2018 11:05 PM, Nishanth Aravamudan wrote: > On 26.09.2018 [10:25:19 -0700], Nishanth Aravamudan wrote: >> >> I found another issue today, while attempting to test (with 61/60 >> applied) separate coscheduling cgroups for vcpus and emulator threads >> [the default configuration with libvirt]. > > > > [ 764.132461] BUG: unable to handle kernel NULL pointer dereference at 0000000000000040 > [ 764.141001] PGD 0 P4D 0 > [ 764.144020] Oops: 0000 [#1] SMP PTI > [ 764.147988] CPU: 70 PID: 0 Comm: swapper/70 Tainted: G OE 4.19-0rc3.ag-generic #4+1536951040do~8680a1b > [ 764.159086] Hardware name: Dell Inc. PowerEdge R640/0W23H8, BIOS 1.2.11 10/19/2017 > [ 764.166968] RIP: 0010:set_next_entity+0x15/0x1d0 I got it reproduced. I will send a fix, when I have one. Regards Jan