From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752642AbaHTNna (ORCPT ); Wed, 20 Aug 2014 09:43:30 -0400 Received: from mail-bn1lp0140.outbound.protection.outlook.com ([207.46.163.140]:23003 "EHLO na01-bn1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752386AbaHTNnG convert rfc822-to-8bit (ORCPT ); Wed, 20 Aug 2014 09:43:06 -0400 From: Dexuan Cui To: Sitsofe Wheeler CC: KY Srinivasan , Greg Kroah-Hartman , Haiyang Zhang , "devel@linuxdriverproject.org" , "linux-kernel@vger.kernel.org" , Jean-Christophe Plagniol-Villard , "linux-fbdev@vger.kernel.org" , Kylie Liang Subject: RE: [PANIC, hyperv] BUG: unable to handle kernel paging request at ffff880077800004 (hv_ringbuffer_write) Thread-Topic: [PANIC, hyperv] BUG: unable to handle kernel paging request at ffff880077800004 (hv_ringbuffer_write) Thread-Index: AQHPvFjgvav2zR0lYke3SB9WxJlS05vZVRgggAAJOQCAACEkgA== Date: Wed, 20 Aug 2014 13:42:48 +0000 Message-ID: References: <20140820092630.GA1478@sucs.org> <20140820114014.GB7980@sucs.org> In-Reply-To: <20140820114014.GB7980@sucs.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.3.92] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:131.107.125.37;CTRY:US;IPV:CAL;IPV:NLI;IPV:NLI;EFV:NLI;SFV:NSPM;SFS:(6009001)(438002)(199003)(13464003)(189002)(51914003)(164054003)(51704005)(377454003)(74502001)(47776003)(77982001)(81342001)(26826002)(92726001)(80022001)(86362001)(68736004)(50986999)(85306004)(81156004)(76482001)(107046002)(74662001)(54356999)(79102001)(69596002)(16796002)(23726002)(33656002)(92566001)(77096002)(97736001)(76176999)(31966008)(55846006)(85806002)(110136001)(106116001)(83322001)(85852003)(84676001)(6806004)(99396002)(87936001)(19580395003)(4396001)(95666004)(46406003)(50466002)(81542001)(20776003)(86612001)(106466001)(21056001)(46102001)(97756001)(1411001)(15975445006)(44976005)(83072002)(64706001)(2656002);DIR:OUT;SFP:;SCL:1;SRVR:BL2PR03MB241;H:mail.microsoft.com;FPR:;MLV:ovrnspm;PTR:InfoDomainNonexistent;A:1;MX:1;LANG:en; X-Microsoft-Antispam: BCL:0;PCL:0;RULEID:;UriScan:; X-O365ENT-EOP-Header: Message processed by - O365_ENT: Allow from ranges (Engineering ONLY) X-Forefront-PRVS: 03094A4065 Authentication-Results: spf=pass (sender IP is 131.107.125.37) smtp.mailfrom=decui@microsoft.com; X-OriginatorOrg: microsoft.onmicrosoft.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > -----Original Message----- > From: Sitsofe Wheeler > Sent: Wednesday, August 20, 2014 19:40 PM > > I suppose you're using the latest mainline v3.17-rc1(7d1311b9). > > That's right - Linux 3.17-rc1 > (7d1311b93e58ed55f3a31cc8f94c4b8fe988a2b9). Ok, let me try to reproduce it first. > > Can you please attach your kernel config file so that I can try to reproduce > > the issue more easily? > > Sure (it's pretty much the same one mentioned in > https://lkml.org/lkml/2014/8/19/101 and > https://lkml.org/lkml/2014/8/19/708 but those don't seem framebuffer > related) but just in case I'll attach it to this mail. Thanks for the info! > > Do you mean the issue only happens to UP guest and doesn't happen to > > SMP guest? > > Yes - if in Windows I go to Hyper-V Manager, press the right mouse > button over the guest and go to Settings..., click on Processor at the > left and set the Number of virtual processors to 1 on the right then > this issue occurs. If the number is greater than 1 then this does not > seem to occur. It's strange SMP guest is ok while UP is not ok. :-( Thanks, -- Dexuan