Package: systemd
Version: 44-5
Severity: normal
Hello systemd maintainers,
Filing this as a bug report so that it is publicly accessible for future
reference.
I am trying to prepare a systemd service file for Laptop Mode Tools and have
run into
some problems.
LMT is a power saving tool written in shell. It has a polling script
that starts from the main script, and then detaches itself to keep
running in a loop.
>From what I have investigated so far, it looks like systemd prefers to
create a cgroup for each service and keep all its associated processes
together.
This seems to create problems for LMT. It's polling script does not seem
to be getting detached from the parent calling process.
rrs@champaran:/run/lock$ sudo systemctl status laptop-mode.service
[sudo] password for rrs:
laptop-mode.service - Laptop Mode Tools
Loaded: loaded (/lib/systemd/system/laptop-mode.service;
enabled)
Active: active (running) since Sun, 28 Oct 2012 13:59:28
+0530; 17min ago
Process: 14102 ExecStopPost=/bin/rm -f
/var/run/laptop-mode-tools/enabled (code=exited, status=0/SUCCESS)
Process: 13394 ExecStop=/usr/sbin/laptop_mode stop
(code=exited, status=0/SUCCESS)
Process: 14174 ExecStartPre=/usr/bin/touch
/var/run/laptop-mode-tools/enabled (code=exited, status=0/SUCCESS)
Process: 14172 ExecStartPre=/usr/bin/install -d
/var/run/laptop-mode-tools (code=exited, status=0/SUCCESS)
Main PID: 14176 (laptop_mode)
CGroup: name=systemd:/system/laptop-mode.service
├ 14176 /bin/sh /usr/sbin/laptop_mode auto
├ 14197 /bin/sh
/usr/share/laptop-mode-tools/module-helpers/lm-polling-daemon
└ 15964 sleep 150
Ideally, pid 14197 should have been backgrounded, and pid 14176 should
have clean exited, leaving pid 14197 to loop. It does not allow that.
Here is the list of locks not released:
rrs@champaran:/run/lock$ sudo lsof lm*
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
laptop_mo 14176 root 7w REG 0,14 0 3664 lmt-battpoll.lock
laptop_mo 14176 root 8w REG 0,14 0 6980 lmt-req.lock
laptop_mo 14176 root 9w REG 0,14 0 3682 lmt-invoc.lock
lm-pollin 14197 root 7w REG 0,14 0 3664 lmt-battpoll.lock
sleep 16138 root 7w REG 0,14 0 3664 lmt-battpoll.lock
The lock for lmt-battpoll.lock should only be with lm-polling-daemon.
But since systemd never disassociated it from the group, the lock is
held.
This leads to further invocations of LMT to fail because they can't
acquire the lock.
I have verified this with SysV init and it works perfectly fine there.
Here is my .service file:
rrs@champaran:/run/lock$ cat /lib/systemd/system/laptop-mode.service
[Unit]
Description=Laptop Mode Tools
[Service]
Type=simple
ExecStartPre=/usr/bin/install -d /var/run/laptop-mode-tools ;
/usr/bin/touch /var/run/laptop-mode-tools/enabled
ExecStart=/usr/sbin/laptop_mode auto
ExecStop=/usr/sbin/laptop_mode stop
ExecStopPost=/bin/rm -f /var/run/laptop-mode-tools/enabled
StandardOutput=tty
StandardError=tty
[Install]
WantedBy=multi-user.target
I have tried for Type=simple and Type=oneshot. Both seem to be
inheriting the same problem.
Ritesh
-- System Information:
Debian Release: wheezy/sid
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'testing'), (100, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 3.5-trunk-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages systemd depends on:
ii dpkg 1.16.9
ii initscripts 2.88dsf-32
ii libacl1 2.2.51-8
ii libaudit0 1:1.7.18-1.1
ii libc6 2.13-36
ii libcap2 1:2.22-1.2
ii libcryptsetup4 2:1.4.3-2
ii libdbus-1-3 1.6.8-1
ii libkmod2 9-2
ii liblzma5 5.1.1alpha+20120614-1
ii libpam0g 1.1.3-7.1
ii libselinux1 2.1.9-5
ii libsystemd-daemon0 44-5
ii libsystemd-id128-0 44-5
ii libsystemd-journal0 44-5
ii libsystemd-login0 44-5
ii libudev0 175-7
ii libwrap0 7.6.q-24
ii udev 175-7
ii util-linux 2.20.1-5.2
Versions of packages systemd recommends:
ii libpam-systemd 44-5
Versions of packages systemd suggests:
ii python 2.7.3-3
ii python-cairo 1.8.8-1+b2
ii python-dbus 1.1.1-1
ii systemd-gui 44-5
-- Configuration Files:
/etc/systemd/system.conf changed:
[Manager]
LogLevel=info
LogTarget=journal-or-kmsg
LogColor=yes
ShowStatus=yes
SysVConsole=yes
MountAuto=yes
SwapAuto=yes
-- no debconf information
--
To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org
with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
