virtualbox.org

I have VirtualBox 6.1 + Extension Pack 6.1.10 installed from the Oracle repo on a CentOS 7.8.2003 system.

VB frequently stops recognizing USB devices. The cmd "VBoxManage list usbhost" returns <none> and no devices are displayed on the VB devices menus. Then I have to logout/login and then VB finds the USB devices again (at least the 1st time I run VB).

When run as root ("sudo VBoxManage list usbhost") the USB devices are listed

I have studied previous posts and USB troubleshooting and could not find similar behavior reported before.

I found the following USB related error messages in ~/.config/VirtualBox/VBoxSVC.log:
...
00:00:00.107117 nspr-2 Failed to initialise host USB using sysfs
...
00:00:00.788373 nspr-4 WARNING [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={16ced992-5fdc-4aba-aff5-6a39bbd7c38b} aComponent={HostWrap} aText={Could not load the Host USB Proxy service: VERR_DISK_FULL}, preserve=true aResultDetail=0

When running VB 1st time after login (with USB working) i find in the same file:

00:00:00.135829 nspr-2 Successfully initialised host USB using sysfs

I attach a tar file with info required for USB troubleshooting: output of id, VBoxManage list, etc commands, VBox.log & VBoxSVC.log for good & bad case

The command groups will tell whether you are in the correct group vboxuser.

Thanks for the reply.

I have already checked all known issues regarding USB, including the vboxusers group problem.

Commands like "groups" or "id" all show that my user is a member of vboxusers.