Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S968339Ab3HJBHu (ORCPT ); Fri, 9 Aug 2013 21:07:50 -0400 Received: from netrider.rowland.org ([192.131.102.5]:58319 "HELO netrider.rowland.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S968309Ab3HJBHt (ORCPT ); Fri, 9 Aug 2013 21:07:49 -0400 Date: Fri, 9 Aug 2013 21:07:48 -0400 (EDT) From: Alan Stern X-X-Sender: stern@netrider.rowland.org To: Thomas Richter cc: linux@brodo.de, Subject: Re: [HANG] Trouble with NEC-based USB adapter in PCMCIA slot on E7110 In-Reply-To: <520577E4.4080401@rus.uni-stuttgart.de> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1524 Lines: 37 On Sat, 10 Aug 2013, Thomas Richter wrote: > Hi Alan, > > >> Will try and report back, thanks. I've bisected it down in the meantime > >> to a change from 2.6.31.6 to 2.6.32.6. Interestingly, this is very much > >> the same time when the udev userland changed. It works with 2.6.31.6 old > >> udev, but not with 2.6.36.2, new udev. > > > > Can't you use the new udev with the old kernel? > > Nope. udevd refuses to start and says that it requires at least 2.6.32, > which means that apparently something changed in the kernel-userland > interface in 2.6.32. Thus, my conclusion that there's probably something > nasty going on in userland with udev. What about the old udev with the newer kernel? > Here's what I got: "messages" - output from /var/log/messages. Note that > the mount hangs exactly at the SCSI 2A command you see there, then tries > to reset the device after probably 20 seconds or so. It looks like the controller is having trouble sending the large packets for the write. I have no idea why. At this point, bisection continues to look like the best approach. Maybe you can confine the search to just the commits that touch files under drivers/usb/host; then perhaps the intermediate kernels will continue to work with the old udev. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/