From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from ns01.unsolicited.net ([69.10.132.115]:34884 "EHLO ns01.unsolicited.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754796AbZEZSpK (ORCPT ); Tue, 26 May 2009 14:45:10 -0400 Message-ID: <4A1C37F8.2090703@unsolicited.net> Date: Tue, 26 May 2009 19:42:00 +0100 From: David MIME-Version: 1.0 To: Pete Zaitcev CC: Alan Stern , USB list , Pekka Enberg , linux-media@vger.kernel.org, Linux Kernel Mailing List , dbrownell@users.sourceforge.net, leonidv11@gmail.com, Greg KH , Andrew Morton , "Rafael J. Wysocki" Subject: Re: USB/DVB - Old Technotrend TT-connect S-2400 regression tracked down References: <4A1967A2.4050906@unsolicited.net> <20090524203902.594a0eec.zaitcev@redhat.com> <4A1A5E24.20201@unsolicited.net> <4A1A8E53.9060108@unsolicited.net> <20090525184843.33c93006.zaitcev@redhat.com> In-Reply-To: <20090525184843.33c93006.zaitcev@redhat.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: Pete Zaitcev wrote: > On Mon, 25 May 2009 13:25:55 +0100, David wrote: > > > I suppose so. I misunderstood how this worked. I guessed that the > DMA API debugging was the culprit because its introduction coincided > with the recent onset of this oops. > > Although usbmon does essentially illegal tricks to look at data > already mapped for DMA, the code used to work for a few releases. > Bisecting may help. I cannot be sure of it though, and it's > going to take a lot of reboots. > > Unfortunately, although I have an Opteron, the issue does not > occur here, so I'm at a loss for the moment. But I'll have to > tackle it somehow. Not sure how though. Any suggestions are welcome. > > -- Pete > I've been doing a bit of random rebooting (I don't really have time to do a full bisect), and can reproduce the usbmon panic on this machine back to 2.6.24.. so it certainly hasn't appeared that recently. Cheers David