linux-kernel - Re: USB/DVB - Old Technotrend TT-connect S-2400 regression tracked down

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Message-ID: <4A1C37F8.2090703@unsolicited.net>
Date:	Tue, 26 May 2009 19:42:00 +0100
From:	David <david@...olicited.net>
To:	Pete Zaitcev <zaitcev@...hat.com>
CC:	Alan Stern <stern@...land.harvard.edu>,
	USB list <linux-usb@...r.kernel.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-media@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dbrownell@...rs.sourceforge.net, leonidv11@...il.com,
	Greg KH <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: USB/DVB - Old Technotrend TT-connect S-2400 regression tracked
 down

Pete Zaitcev wrote:
> On Mon, 25 May 2009 13:25:55 +0100, David <david@...olicited.net> 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
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