Package: sane-utils
Version: 1.0.24-8
Severity: important
Dear Maintainer,
After upgrading my Pi 2 Debian install from wheezy to jessie, I was
running into systemd chewing up as much CPU power as it could get its
hands on. Running 'journalctl -f' showed it printing "Looping too
fast. Throttling execution a little." approximately every 2 seconds
for quite a while after system boot. Although this stopped after some
uptime, the high CPU usage remained. Running "systemctl --failed"
showed that "saned.service" had failed. This causes other issues, such
as a lack of any VTs and an inability to normally reboot (although a
shutdown can be forced by killing PID 1, but that's hardly ideal!).
A quick trip to the #debian-systemd channel on OFTC seems to have
established that this is because of the "Alias=saned" line at the end
of the /lib/systemd/system/saned@.service file, which is packaged with
sane-utils.
Apparently, "when /etc/init.d/sane goes up, systemd hits up
saned@.service, which it should not" because "saned@.service should
only go up with saned.socket". Two people on the channel recommended
dropping the "Alias=saned" line, and one also suggested that a
/dev/null symlink should be packaged for
/lib/systemd/system/saned.service. In theory, any program attempting
to access a scanner will just be poking [::]6566 anyways, which then
will prompt systemd to run saned@.service. Although I think I
understand that, I won't claim to be sure; what I am sure of is that
removing the "Alias=saned" line does indeed solve the problem for me.
(Apologies if anything is incomplete or mistaken in this bug report,
after many years using Debian and derivatives this is actually my
first time directly submitting a bug here. Cheers!)
-- System Information:
Distributor ID: Raspbian
Description: Raspbian GNU/Linux 8.0 (jessie)
Release:
8.0
Codename: jessie
Architecture: armv7l
Kernel: Linux 3.18.5-v7+ (SMP w/4 CPU cores; PREEMPT)
Locale: LANG=en_US.UTF-8,
LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages sane-utils depends on:
ii adduser 3.113+nmu3
ii debconf [debconf-2.0] 1.5.55
ii
init-system-helpers 1.22
ii
libavahi-client3 0.6.31-4
ii libavahi-common3 0.6.31-4
ii
libc6 2.19-13
ii libieee1284-3 0.2.11-12
ii libsane 1.0.24-8
ii libsystemd0 215-11
ii libusb-1.0-0 2:1.0.19-1
ii update-inetd 4.43
sane-utils recommends no packages.
Versions of packages sane-utils suggests:
pn avahi-daemon <none>
pn unpaper <none>
-- debconf information:
sane-utils/saned_run: false
sane-utils/saned_scanner_group: true
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