usbipd detach doesn't exit properly

[bimmerdriver]

Hi All,

I'm using github.com/dorssel/usbipd-win with WSL2 and Ubuntu 22.04 on a desktop computer running Windows 10 22H2. Everything is up-to-date.

My usecase for usbipd-win requires the USB device to be attached before a service in default.target starts. I'm trying to write a systemd service to attach the device. I've never done this before, but it seems simple enough. I need the service to support start, stop and restart.

"sudo systemctl start usbipd-win.service" will attach the device
"sudo systemctl stop usbipd-win.service" will detach the device
"sudo systemctl restart usbipd-win.service" will detach and attach the device

Here are the commands I'm using for attaching and detaching the USB device:

ExecStart=bash -c "/mnt/c/'Program Files'/usbipd-win//usbipd.exe attach --wsl --busid=4.4"
ExecStop=bash -c "/mnt/c/'Program Files'/usbipd-win//usbipd.exe detach --busid=4-4"

systemctl start usbipd-win.service works properly
systemctl stop usbipd-win.service works properly
systemctl restart usbipd-win.service works results in this error:

Job for usbipd-win.service failed because the control process exited with error code.
See "systemctl status usbipd-win.service" and "journalctl -xeu usbipd-win.service" for details.

In order to find out what the problem is, I executed the commands in a batch file on windows. What I found is that usbipd detach doesn't exit properly if a device was attached. When the usbipd attach command executes after the usbipd detach command it doesn't work properly.

It generates the following error:

usbipd: error: There is no device with busid '4-4'.

(busid 4-4 is the actual busid of the particular device I'm testing with.)

The behaviour is exactly the same if I execute usbipd detach on Windows or usbipd.exe detach in bash on Linux.

If I run a stand-alone usbipd detach command, it displays a windows command prompt, but the command prompt isn't working properly. For example, I can't up or down arrow to rerun a command, even if I enter CTRL-C to force an exit. I found that by clicking the mouse in the window, it seems to exit, after which I can up or down arrow the command line and then I can enter another command.

I tried using both wait and sleep in the bash script and neither worked. The command prompt was always hung until I did a mouse click in the window.

I also made a windows batch file and tried putting a timeout after the usbipd detach and it didn't reliably make any difference.

This points to usbipd detach not exiting properly. However, I posted in github.com/dorssel/usbipd-win/discussions and he says nothing is wrong.

Does anyone know of a work-around that I can use in bash?

I was wondering about trying native usbipd in linux, but I can't locate a version of the linux-tools package that is built for WSL2.

Any suggestions will be appreciated.

Thank you.

[bimmerdriver]

At the suggestion of @dorssel, I tried installing linux-tools-virtual.

The result is below. I've been down this road and I have noticed that I'm not alone.

$ sudo apt install linux-tools-virtual
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:
hwdata linux-tools-5.15.0-101 linux-tools-5.15.0-101-generic linux-tools-common
The following NEW packages will be installed:
hwdata linux-tools-5.15.0-101 linux-tools-5.15.0-101-generic linux-tools-common linux-tools-virtual
0 upgraded, 5 newly installed, 0 to remove and 0 not upgraded.
Need to get 7962 kB/8292 kB of archives.
After this operation, 28.6 MB of additional disk space will be used.

[deletia]

$ usbip
WARNING: usbip not found for kernel 5.15.146.1-microsoft

You may need to install the following packages for this specific kernel:
linux-tools-5.15.146.1-microsoft-standard-WSL2
linux-cloud-tools-5.15.146.1-microsoft-standard-WSL2

You may also want to install one of the following packages to keep up to date:
linux-tools-standard-WSL2
linux-cloud-tools-standard-WSL2

Those packages don't exist, which is why I requested that the WSL team build whatever package provides usbip.