[sane-devel] segfault in sane_net_get_devicesconnecting to network saned

m. allan noah kitno455 at gmail.com
Tue May 11 18:09:05 UTC 2010

Ok- let me first appologize if you took Julien the wrong way. You see,
any program that uses sane-backends is effectively pulling the
backends into it's running process, giving it all manner of options to
screw things up. In the absence of source code, it can be very
difficult to identify the culprit. As such, it is very frustrating for
those of us that provide this free support to you, to hear complaints
about cost of such code. You just accidentally hit a nerve, i think :)

Anyway, lets see if we can try a couple of things:

1. can you enable the test backend on the server, and disable the
brother backend in /etc/sane.d/dll.conf? lets see if that at least
shows up with scanimage -L on localhost and on the client.

2. can you run saned with the -d flag, and see what is going on when
brother is enabled?


On Tue, May 11, 2010 at 1:44 PM, Brian J. Murrell <brian at interlinx.bc.ca> wrote:
> Julien BLACHE <jb <at> jblache.org> writes:
>> Hi,
> Hi,
>> Did you contact Brother asking them to contribute the code to their
>> driver to SANE?
> Of course I did, in the context of the printer driver.  There was no point in
> talking about the scanner driver once they made their position on their
> "proprietary trade secrets" position on their printer driver known.
>> Because that's actually what you should do.
> Been there, done that.
>> That, and
>> letting them know that you're ditching their hardware for something
>> else.
> Well, maybe you have an unlimited income from which you can just throw away
> hardware and buy new, but some of us have to budget their income and cannot so
> easily just throw things in the garbage and buy new.  Had a new scanner and/or
> printer been in my budget, yes, I would have bought the one that didn't need
> binary drivers, but it is what it is.
>> Or you put it up on Ebay and get supported hardware to replace it :)
> See above about budgeting income.  Selling it on E-bay, for less than it is
> worth to purchase new, only to have to add more money (than just the resale
> loss) to the proceeds to buy an even more expensive printer than the one I just
> sold at a loss.
>> When scanning with xsane as a user, the permissions are set for you by
>> ConsoleKit (after udev enabled that when you plugged the scanner in).
> Yes.
>> saned just doesn't benefit from this, not being a regular user logged in
>> on the "console".
> Fine.  But see below regarding permissions...
> That said, I think you are also losing sight of the original issue here, which
> is the segfault in libsane, not a permissions issue.  I regret ever having
> mentioned the permissions issue as it seems to have distracted you from the
> segfault.  I can deal with the permissions issue elsewhere.
>> So you need to configure your system properly, and, in that regard,
>> reading /usr/share/doc/sane-utils/README.Debian will help a lot.
> OK.  So doing a:
> $ sudo chgrp scanner /dev/bus/usb/002/002
> allows xsane to work.  And just for good measure I set the permissions bits to
> 666:
> $ sudo chmod 666 /dev/bus/usb/002/002
> So I think we can move past the permissions issues, yes?
> Even with all of this, xsane still segfaults when I have "localhost" enabled in
> /etc/sane.d/net.conf.  Can we agree that this is not a permissions problem now
> and move on to the actual segfault?
> FWIW, I have grabbed the libsane sources and will apply my debugging skills to
> this issue when I can find a few hours.  But no doubt I am going to flounder
> around a bit longer (simply due to not knowing the structure of the code, yet)
> that it would likely take somebody here familiar with the code to find the
> issue, which is why I posted here.  If more information would make the task any
> easier, I am happy to oblige.  I know how to drive a complier and debugger and
> so on.
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