Fun fact: sane_exit(), contrary to its documentation, does not clean up all the resources used by sane and its backends.
Specifically, a bunch of backends will fail to close the file descriptors opened in sane_get_devices(). Since colord-sane rescans for devices on a timer, after some time we run out of fds. On Ubuntu, this results in a crash in the FORTIFY_SOURCE checks when sane tries to add an fd > 1024 to an FD_SET. It seems we don't build with that on Debian, so we instead it seems we try to select() on an invalid fd. With hilarious consequences! Urgh. So I'll rework colord-sane to only call sane_get_devices once before exiting, and just get respawned for each poll.
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