[systemd-devel] systemd has not the same behaviour following the version of the kernel ; StopWhenUnneeded no longer works
Hi,
I'm using debian 10 (systemd 241) . I launch a service (tank.service) when a
specific USB device is connected. For that, i have written an udev rule that
requests the service start in case of < add > event, thanks to <
SYSTEMD_WANTS > :
SUBSYSTEM=="usb", ACTION=="add", ATTRS{idVendor}=="04b4",
ATTRS{idProduct}=="6570", TAG+="systemd", ENV{SYSTEMD_WANTS}="tank.service"
I want service to be stopped when the USB device is removed. For that, I use
< StopWhenUnneeded > feature.
tank.service :
[Unit]
Description= tank routine
StopWhenUnneeded=true
[Service]
Type=simple
ExecStartPre=-/bin/bash /actimyo/bin/tankinsert.sh
ExecStart=/bin/bash /actimyo/bin/tank.sh
ExecStop=/bin/bash /actimyo/bin/tankremove.sh
With kernel 4.9.150 , it works well : the service is stopped when the USB
device is removed.
However, I updated the kernel to version 5.15.32 and the service do not stop
when the USB device is removed . The feature < StopWhenUnneeded > no longer
works.
Does anybody understand why ? Could anybody give me a solution ?
Systemd logs when USB device is removed with kernel 4.9.150 (complete logs
in attached file < logs systemd removing tank-4-9-150.txt >) :
Jun 17 09:21:34 b-0024 kernel: usb 1-1: USB disconnect, device number 2
Jun 17 09:21:34 b-0024 kernel: usb 1-1.2: USB disconnect, device number 3
Jun 17 09:21:34 b-0024 systemd[1]: tank.service: Unit is not needed anymore.
Jun 17 09:21:34 b-0024 systemd[1]: tank.service: Trying to enqueue job
tank.service/stop/fail
Jun 17 09:21:34 b-0024 systemd[1]: Added job tank.service/stop to
transaction.
Jun 17 09:21:34 b-0024 systemd[1]: tank.service: Installed new job
tank.service/stop as 724
Jun 17 09:21:34 b-0024 systemd[1]: tank.service: Enqueued job
tank.service/stop as 724
Jun 17 09:21:34 b-0024 systemd[1]: Sent message type=signal sender=n/a
destination=n/a path=/org/freedesktop/systemd1/unit/tank_2eservice
interface=org.freedesktop.DBus.Properties member=PropertiesChanged
cookie=605 reply_cookie=0 signature=sa{sv}as error-name=n/a
error-message=n/a
Jun 17 09:21:34 b-0024 systemd[1]: Sent message type=signal sender=n/a
destination=n/a path=/org/freedesktop/systemd1/unit/tank_2eservice
interface=org.freedesktop.DBus.Properties member=PropertiesChanged
cookie=606 reply_cookie=0 signature=sa{sv}as error-name=n/a
error-message=n/a
Jun 17 09:21:34 b-0024 systemd[1]: Sent message type=signal sender=n/a
destination=n/a path=/org/freedesktop/systemd1
interface=org.freedesktop.systemd1.Manager member=JobNew cookie=607
reply_cookie=0 signature=uos error-name=n/a error-message=n/a
Jun 17 09:21:34 b-0024 systemd[1]: tank.service: About to execute: /bin/bash
/actimyo/bin/tankremove.sh
Jun 17 09:21:34 b-0024 systemd[1]: tank.service: Forked /bin/bash as 2496
Jun 17 09:21:34 b-0024 systemd[1]: Sent message type=signal sender=n/a
destination=n/a path=/org/freedesktop/systemd1/unit/tank_2eservice
interface=org.freedesktop.DBus.Properties member=PropertiesChanged
cookie=608 reply_cookie=0 signature=sa{sv}as error-name=n/a
error-message=n/a
Jun 17 09:21:34 b-0024 systemd[1]: Sent message type=signal sender=n/a
destination=n/a path=/org/freedesktop/systemd1/unit/tank_2eservice
interface=org.freedesktop.DBus.Properties member=PropertiesChanged
cookie=609 reply_cookie=0 signature=sa{sv}as error-name=n/a
error-message=n/a
Jun 17 09:21:34 b-0024 systemd[1]: tank.service: Changed running -> stop
Jun 17 09:21:34 b-0024 systemd[1]: Stopping Detect tank presence...
Jun 17 09:21:34 b-0024 systemd[2496]: tank.service: Executing: /bin/bash
/actimyo/bin/tankremove.sh
Systemd logs when USB device is removed with kernel 5.15.32 (complete logs
in attached file < logs systemds removing tank kernel-5-15-32.txt >):
Jun 17 09:21:33 b-0021 kernel: [ 438.934344] usb 1-1: USB disconnect,
device number 2
Jun 17 09:21:33 b-0021 kernel: [ 438.939373] usb 1-1.2: USB disconnect,
device number 3
Jun 17 09:21:33 b-0021 systemd[1]: tank.service: tank.service lost
dependency
WantedBy=sys-devices-platform-soc-210.bus-2184000.usb-ci_hdrc.0-usb1-1\x
2d1.device
Jun 17 09:21:33 b-0021 systemd[1]: tank.service: tank.service lost
dependency
ReferencedBy=sys-devices-platform-soc-210.bus-2184000.usb-ci_hdrc.0-usb1
-1\x2d1.device
Best regards
---
Eric-Olivier Perrin
[email protected]
SYSNAV
72, rue Emile Loubet
27200 Vernon (France)
+33.(0)2.78.77.03.46
Re: [systemd-devel] systemd has not the same behaviour following the version of the kernel ; StopWhenUnneeded no longer works
Thanks for your answer. After some research, it seems that issue is already registered and fixed : https://github.com/systemd/systemd/issues/23410 BR, Eric -Message d'origine- De : systemd-devel De la part de Colin Guthrie Envoyé : mercredi 28 septembre 2022 18:18 À : [email protected] Objet : Re: [systemd-devel] systemd has not the same behaviour following the version of the kernel ; StopWhenUnneeded no longer works Long standing issue with udev rules and a kernel change. IIRC you should try ACTION!="remove" in your udev rule instead. There are other posts on the list about this but I'm running out the door so thought I'd through a hint at least - if it doesn't work, I may have got the action name wrong, so look around! Cheers Col [email protected] wrote on 27/09/2022 16:16: > Hi, > > I’m using debian 10 (systemd 241) . I launch a service (tank.service) > when a specific USB device is connected. For that, i have written an > udev rule that requests the service start in case of « add » event, > thanks to « SYSTEMD_WANTS » : > > /SUBSYSTEM=="usb", ACTION=="add", ATTRS{idVendor}=="04b4", > ATTRS{idProduct}=="6570", TAG+="systemd", > ENV{SYSTEMD_WANTS}="tank.service"/ > > I want service to be stopped when the USB device is removed. For that, > I use « StopWhenUnneeded » feature. > > tank.service : > > /[Unit]/ > > /Description= tank routine/ > > */StopWhenUnneeded=true/* > > // > > /[Service]/ > > /Type=simple/ > > // > > /ExecStartPre=-/bin/bash /actimyo/bin/tankinsert.sh/ > > /ExecStart=/bin/bash /actimyo/bin/tank.sh/ > > /ExecStop=/bin/bash /actimyo/bin/tankremove.sh/ > > // > > With kernel 4.9.150 , it works well : the service is stopped when the > USB device is removed. > > However, I updated the kernel to version 5.15.32 and the service do > not stop when the USB device is removed . The feature « > StopWhenUnneeded » no longer works. > > Does anybody understand why ? Could anybody give me a solution ? > > _Systemd logs when USB device is removed with kernel 4.9.150 (complete > logs in attached file « logs systemd removing tank-4-9-150.txt ») :_ > > Jun 17 09:21:34 b-0024 kernel: usb 1-1: USB disconnect, device number > 2 > > Jun 17 09:21:34 b-0024 kernel: usb 1-1.2: USB disconnect, device > number 3 > > Jun 17 09:21:34 b-0024 systemd[1]: tank.service: Unit is not needed anymore. > > Jun 17 09:21:34 b-0024 systemd[1]: tank.service: Trying to enqueue job > tank.service/stop/fail > > Jun 17 09:21:34 b-0024 systemd[1]: Added job tank.service/stop to > transaction. > > Jun 17 09:21:34 b-0024 systemd[1]: tank.service: Installed new job > tank.service/stop as 724 > > Jun 17 09:21:34 b-0024 systemd[1]: tank.service: Enqueued job > tank.service/stop as 724 > > Jun 17 09:21:34 b-0024 systemd[1]: Sent message type=signal sender=n/a > destination=n/a path=/org/freedesktop/systemd1/unit/tank_2eservice > interface=org.freedesktop.DBus.Properties member=PropertiesChanged > cookie=605 reply_cookie=0 signature=sa{sv}as error-name=n/a > error-message=n/a > > Jun 17 09:21:34 b-0024 systemd[1]: Sent message type=signal sender=n/a > destination=n/a path=/org/freedesktop/systemd1/unit/tank_2eservice > interface=org.freedesktop.DBus.Properties member=PropertiesChanged > cookie=606 reply_cookie=0 signature=sa{sv}as error-name=n/a > error-message=n/a > > Jun 17 09:21:34 b-0024 systemd[1]: Sent message type=signal sender=n/a > destination=n/a path=/org/freedesktop/systemd1 > interface=org.freedesktop.systemd1.Manager member=JobNew cookie=607 > reply_cookie=0 signature=uos error-name=n/a error-message=n/a > > Jun 17 09:21:34 b-0024 systemd[1]: tank.service: About to execute: > /bin/bash /actimyo/bin/tankremove.sh > > Jun 17 09:21:34 b-0024 systemd[1]: tank.service: Forked /bin/bash as > 2496 > > Jun 17 09:21:34 b-0024 systemd[1]: Sent message type=signal sender=n/a > destination=n/a path=/org/freedesktop/systemd1/unit/tank_2eservice > interface=org.freedesktop.DBus.Properties member=PropertiesChanged > cookie=608 reply_cookie=0 signature=sa{sv}as error-name=n/a > error-message=n/a > > Jun 17 09:21:34 b-0024 systemd[1]: Sent message type=signal sender=n/a > destination=n/a path=/org/freedesktop/systemd1/unit/tank_2eservice > interface=org.freedesktop.DBus.Properties member=PropertiesChanged > cookie=609 reply_cookie=0 signature=sa{sv}as error-name=n/a > error-message=n/a > > Jun 17 09:21:34 b-0024 systemd[1]: tank.service: Changed running -> > stop > > Jun 17 09:21:34 b-0024 systemd[1]: Stopping Detect tank presence... > > Jun 17 09:21:34 b-0024 systemd[2496]: tank.service: Executing: > /bin/bash /actimyo/bin/tankremove.sh > > _Systemd logs_ _when USB device is removed with kernel 5.15.32 > (complete logs in attached file « logs systemds removing tank > kernel-5-15-32.txt »):_ > > Jun 17 09:21:33 b-0021 kernel: [ 438.934344] usb 1-1: USB disconnect, > device number 2 > > Jun 17 09:21:33 b-0021 kernel:
