From owner-freebsd-hackers@freebsd.org  Tue Feb 20 18:19:23 2018
Return-Path: <owner-freebsd-hackers@freebsd.org>
Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 5A987F1C240
 for <freebsd-hackers@mailman.ysv.freebsd.org>;
 Tue, 20 Feb 2018 18:19:23 +0000 (UTC) (envelope-from hps@selasky.org)
Received: from mail.turbocat.net (turbocat.net [IPv6:2a01:4f8:c17:6c4b::2])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id F0617846A5
 for <freebsd-hackers@FreeBSD.org>; Tue, 20 Feb 2018 18:19:22 +0000 (UTC)
 (envelope-from hps@selasky.org)
Received: from hps2016.home.selasky.org (unknown [62.141.128.70])
 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
 (No client certificate requested)
 by mail.turbocat.net (Postfix) with ESMTPSA id B91E92603D1;
 Tue, 20 Feb 2018 19:19:21 +0100 (CET)
Subject: Re: 'scanimage -L' from 'graphics/sane-backends' causes system
 crashes after a while
To: Yuri <yuri@rawbw.com>, Freebsd hackers list <freebsd-hackers@FreeBSD.org>
References: <5fe20134-4b4f-4789-fa54-8ce746453130@rawbw.com>
From: Hans Petter Selasky <hps@selasky.org>
Message-ID: <4dc31781-c6df-04bf-0158-fc09d14b3fb8@selasky.org>
Date: Tue, 20 Feb 2018 19:19:21 +0100
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:52.0) Gecko/20100101
 Thunderbird/52.6.0
MIME-Version: 1.0
In-Reply-To: <5fe20134-4b4f-4789-fa54-8ce746453130@rawbw.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 7bit
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.25
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
 <freebsd-hackers.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-hackers>, 
 <mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers/>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
 <mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 20 Feb 2018 18:19:23 -0000

On 02/20/18 19:15, Yuri wrote:
> For my system this works with a 100% reliability: run 'scanimage -L' (or 
> just scan something), and system will crash after a few hours or so.
> 
> '-L' option calls the function 'sane_get_devices', which has about 90 
> implementations there. It calls all of them trying to find a scanner. 
> Some of them cause system to crash later.
> 
> My real scanner is on the wifi network. I'm not sure if the real scanner 
> is what causes the problem, or maybe it's some other test among these 90 
> 'sane_get_devices' functions that causes this problem.
> 
> What is the easiest way to troubleshoot this? The problem is that the 
> crash doesn't come right away.
> 
> 11.1-STABLE
> 

Try ktrac'ing the program first, or run from inside of gdb801 from ports:

gdb801
 > file scanimage
 > run -L

--HPS