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
eric-olivier.perrin@xxxxxxxxx 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: [ 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-2100000.bus-2184000.usb-ci_hdrc.0-usb1-1\x2d1.device
Jun 17 09:21:33 b-0021 systemd[1]: tank.service: tank.service lost
dependency
ReferencedBy=sys-devices-platform-soc-2100000.bus-2184000.usb-ci_hdrc.0-usb1-1\x2d1.device
Best regards
---
Eric-Olivier Perrin
eric-olivier.perrin@xxxxxxxxx <mailto:eric-olivier.perrin@xxxxxxxxx>
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