netdev - Re: usb_mon oops Re: tcpdump crashes 2.6.29.1 (and 2.6.29-rc5)

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Message-ID: <18908.42166.404232.721757@stoffel.org>
Date:	Wed, 8 Apr 2009 09:20:54 -0400
From:	"John Stoffel" <john@...ffel.org>
To:	Pete Zaitcev <zaitcev@...hat.com>
Cc:	"John Stoffel" <john@...ffel.org>,
	Jarek Poplawski <jarkao2@...il.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: usb_mon oops Re: tcpdump crashes 2.6.29.1 (and 2.6.29-rc5)

Pete> On Tue, 7 Apr 2009 11:25:40 -0400, "John Stoffel" <john@...ffel.org> wrote:
>> But I'm surprised that USB_MON would be the cause when it's a
>> networking tool which is starting up?  *shrug*

Pete> The libpcap supports usbmon. Perhaps it scans something.

Pete> The big problem with usbmon is, it has to trust what drivers
Pete> stuff into URBs. Bet it's your uvcvideo. A rough driver, that.

Well I think that usbmon is probably at fault here for trusting
drivers too much and not doing any sanity checking.  But I can try
removing the uvcvideo driver and seeing if I can get the system to
crash then.

I was busy last night and didn't have a chance to even touch the
system.  Hopefully more time tonight, but I'm not sure.

Thanks for the hints, I'll give them a whirl.

John

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