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

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Date:	Sun, 24 May 2009 22:10:50 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Pete Zaitcev <zaitcev@...hat.com>,
	USB list <linux-usb@...r.kernel.org>
cc:	David <david@...olicited.net>,
	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

On Sun, 24 May 2009, David wrote:

> Alan Stern wrote:
> > But if not then this is a genuine bug and it should be reported
> > separately on the linux-usb mailing list.
> >
> >
> >   
> 
> Stranger and stranger. I started usbmon on the quad core and (at the
> console) cat /sys/kernel/debug/usbmon/0u worked fine for the keyboard
> and mouse. I then plugged in the S-2400 and was greeted with this kernel
> panic (jpg attached).
> 
> David

Pete, you should look at this.  It appears to be a problem with the DMA
mapping in usbmon.  Probably the same sort of thing you were working on
about a week ago (trying to access device memory).

Alan Stern

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