'scanimage -L' from 'graphics/sane-backends' causes system crashes after a while

[Yuri]

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

Yuri