From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752225AbaE0LQX (ORCPT ); Tue, 27 May 2014 07:16:23 -0400 Received: from smtprelay06.ispgateway.de ([80.67.31.102]:34481 "EHLO smtprelay06.ispgateway.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751778AbaE0LQW (ORCPT ); Tue, 27 May 2014 07:16:22 -0400 X-Greylist: delayed 374 seconds by postgrey-1.27 at vger.kernel.org; Tue, 27 May 2014 07:16:21 EDT Date: Tue, 27 May 2014 13:10:03 +0200 From: Bernhard Walle To: Haiyang Zhang Cc: "K. Y. Srinivasan" , linux-kernel@vger.kernel.org Subject: Regression in hyperv network driver in 3.14 Message-ID: <20140527111003.GA2214@kepler.fritz.box> Mail-Followup-To: Haiyang Zhang , "K. Y. Srinivasan" , linux-kernel@vger.kernel.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.23 (2014-03-12) X-Df-Sender: MTIyNzgwNg== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, using a 3.14 kernel in a Linux VM running on HyperV (Windows Server 2008 R2) we get following error: hv_netvsc: hv_netvsc channel opened successfully hv_netvsc vmbus_0_9 (unregistered net_device): Unable to complete receive buffer initialization with NetVsp - status 2 hv_netvsc vmbus_0_9 (unregistered net_device): unable to connect to NetVSP - -22 hv_netvsc vmbus_0_9 (unregistered net_device): unable to add netvsc device (ret -22) hv_netvsc: probe of vmbus_0_9 failed with error -22 Bisecting the problem shows that commit b679ef73edc251f6d200a7dd2396e9fef9e36fc3 is responsible. Reverting it fixes the issue. Even only changing NETVSC_RECEIVE_BUFFER_SIZE to 2M fixes the issue! The virtual machine has 2 GiB of memory and 4 CPUs. Can I provide more information to track down the problem? Regards, Bernhard