From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752503Ab2LWXYj (ORCPT ); Sun, 23 Dec 2012 18:24:39 -0500 Received: from mail-pb0-f42.google.com ([209.85.160.42]:52290 "EHLO mail-pb0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751285Ab2LWXYh (ORCPT ); Sun, 23 Dec 2012 18:24:37 -0500 Date: Sun, 23 Dec 2012 15:27:48 -0800 From: Greg Kroah-Hartman To: Linus Torvalds , Woody Suwalski , USB list , Linux Kernel Mailing List Subject: Re: Linux 3.8-rc1 - another regression on USB :-( Message-ID: <20121223232748.GA23804@kroah.com> References: <50D764BA.1030501@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Dec 23, 2012 at 02:35:49PM -0800, Linus Torvalds wrote: > Woody, > Any chance you can bisect this? It's not going to be hugely pleasant > (with 11k+ commits in between 3.7 and 3.8-rc1 you'll have to compile > and test at least 14 kernels), but it would help enormously. Of > course, maybe some USB person can guess what would cause the device to > go offline.. > > Added Greg and the linux-usb mailing list to the participants list: > the images are in the original email on lkml, but there isn't anything > particularly interesting there, it really just seems to be an > unexpected and spurious USB disconnect, resulting in "USB disconnect, > device number 2" followed by "Rejecting I/O to offline device". I don't see any images on lkml, sorry. The kernel log for when the disconnect happened would be great to get. The kernel can't cause a device to disconnect, that's an electrical thing usually, is this perchance a flaky device/connection? Or has it always worked on older kernels? What host controller is being used here (xhci, ehci, etc.?) thanks, greg k-h