After I plugged a suzy q and boots the DUT, lsusb was stuck in the kernel
Removed devices/hubs are not scanned anymore, a workstation reboot is required.
In dmesg:

[11130178.152379] usb 2-1.3.1.3.4: USB disconnect, device number 90
<removal of an older suzyq>
[11130178.352051] usb 2-1.3.1.3.4: new high-speed USB device number 121 using ehci-pci
[11130178.449833] usb 2-1.3.1.3.4: New USB device found, idVendor=18d1, idProduct=5003
[11130178.449836] usb 2-1.3.1.3.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[11130178.449838] usb 2-1.3.1.3.4: Product: servo:810-10010-02
[11130178.449839] usb 2-1.3.1.3.4: Manufacturer: Google Inc
[11130178.449841] usb 2-1.3.1.3.4: SerialNumber: 911416-00542
[11130289.292860] usb 2-1.3.2: new high-speed USB device number 122 using ehci-pci
[11130289.409377] usb 2-1.3.2: New USB device found, idVendor=0424, idProduct=2422
[11130289.409381] usb 2-1.3.2: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[11130289.409647] hub 2-1.3.2:1.0: USB hub found
[11130289.409742] hub 2-1.3.2:1.0: 2 ports detected
[11130289.681286] usb 2-1.3.2.2: new full-speed USB device number 123 using ehci-pci
[11130289.775918] usb 2-1.3.2.2: New USB device found, idVendor=18d1, idProduct=5014
[11130289.775922] usb 2-1.3.2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[11130289.775924] usb 2-1.3.2.2: Product: Cr50
[11130289.775925] usb 2-1.3.2.2: Manufacturer: Google Inc.
[11130289.777976] input: Google Inc. Cr50 as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.3/2-1.3.2/2-1.3.2.2/2-1.3.2.2:1.1/input/input35
[11130289.778094] hid-generic 0003:18D1:5014.003E: input,hidraw3: USB HID v1.00 Keyboard [Google Inc. Cr50] on usb-0000:00:1d.0-1.3.2.2/input1
[11130289.830038] usbcore: registered new interface driver raiden
[11130289.830056] usbserial: USB Serial support registered for Google
[11130289.830078] raiden 2-1.3.2.2:1.0: Google converter detected
[11130289.830158] usb 2-1.3.2.2: Google converter now attached to ttyUSB0
[11130289.830171] raiden 2-1.3.2.2:1.2: Google converter detected
[11130289.830231] usb 2-1.3.2.2: Google converter now attached to ttyUSB1
[11130289.830239] raiden 2-1.3.2.2:1.3: Google converter detected
[11130289.830289] usb 2-1.3.2.2: Google converter now attached to ttyUSB2
<DUT boots up>
[11130292.971062] Google ttyUSB0: Google converter now disconnected from ttyUSB0
[11130292.971076] raiden 2-1.3.2.2:1.0: device disconnected
[11130292.971136] Google ttyUSB1: Google converter now disconnected from ttyUSB1
[11130292.971146] raiden 2-1.3.2.2:1.2: device disconnected
[11130292.971231] Google ttyUSB2: Google converter now disconnected from ttyUSB2
[11130292.971246] raiden 2-1.3.2.2:1.3: device disconnected
[11130293.056958] usb 2-1.3.2.2: reset full-speed USB device number 123 using ehci-pci
[11130294.090780] usb 2-1.3.2.2: USB disconnect, device number 123