I have just found, that the problem occurs earlier. Just after I load the vhci-hcd driver, I can see the following in the kernel log:
[ 115.909607] vhci_hcd vhci_hcd.0: USB/IP Virtual Host Controller [ 115.909614] vhci_hcd vhci_hcd.0: new USB bus registered, assigned bus number 5 [ 115.909645] vhci_hcd: created sysfs vhci_hcd.0 [ 115.909730] usb usb5: New USB device found, idVendor=1d6b, idProduct=0002 [ 115.909734] usb usb5: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 115.909737] usb usb5: Product: USB/IP Virtual Host Controller [ 115.909740] usb usb5: Manufacturer: Linux 4.14.0-3-amd64 vhci_hcd [ 115.909742] usb usb5: SerialNumber: vhci_hcd.0 [ 115.910019] hub 5-0:1.0: USB hub found [ 115.910035] hub 5-0:1.0: 31 ports detected [ 115.911147] vhci_hcd vhci_hcd.0: USB/IP Virtual Host Controller [ 115.911152] vhci_hcd vhci_hcd.0: new USB bus registered, assigned bus number 6 [ 115.911186] usb usb6: We don't know the algorithms for LPM for this host, disabling LPM. [ 115.911237] usb usb6: New USB device found, idVendor=1d6b, idProduct=0003 [ 115.911240] usb usb6: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 115.911243] usb usb6: Product: USB/IP Virtual Host Controller [ 115.911245] usb usb6: Manufacturer: Linux 4.14.0-3-amd64 vhci_hcd [ 115.911248] usb usb6: SerialNumber: vhci_hcd.0 [ 115.911518] hub 6-0:1.0: USB hub found [ 115.911534] hub 6-0:1.0: config failed, hub has too many ports! (err -19) [ 115.911827] vhci_hcd vhci_hcd.1: USB/IP Virtual Host Controller [ 115.911831] vhci_hcd vhci_hcd.1: new USB bus registered, assigned bus number 7 [ 115.911899] usb usb7: New USB device found, idVendor=1d6b, idProduct=0002 [ 115.911902] usb usb7: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 115.911904] usb usb7: Product: USB/IP Virtual Host Controller [ 115.911907] usb usb7: Manufacturer: Linux 4.14.0-3-amd64 vhci_hcd [ 115.911909] usb usb7: SerialNumber: vhci_hcd.1 [ 115.912198] hub 7-0:1.0: USB hub found [ 115.912212] hub 7-0:1.0: 31 ports detected [ 115.913269] vhci_hcd vhci_hcd.1: USB/IP Virtual Host Controller [ 115.913273] vhci_hcd vhci_hcd.1: new USB bus registered, assigned bus number 8 [ 115.913306] usb usb8: We don't know the algorithms for LPM for this host, disabling LPM. [ 115.913359] usb usb8: New USB device found, idVendor=1d6b, idProduct=0003 [ 115.913362] usb usb8: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 115.913365] usb usb8: Product: USB/IP Virtual Host Controller [ 115.913367] usb usb8: Manufacturer: Linux 4.14.0-3-amd64 vhci_hcd [ 115.913370] usb usb8: SerialNumber: vhci_hcd.1 [ 115.913626] hub 8-0:1.0: USB hub found [ 115.913641] hub 8-0:1.0: config failed, hub has too many ports! (err -19) [ 115.913923] vhci_hcd vhci_hcd.2: USB/IP Virtual Host Controller [ 115.913926] vhci_hcd vhci_hcd.2: new USB bus registered, assigned bus number 9 [ 115.913994] usb usb9: New USB device found, idVendor=1d6b, idProduct=0002 [ 115.913997] usb usb9: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 115.913999] usb usb9: Product: USB/IP Virtual Host Controller [ 115.914001] usb usb9: Manufacturer: Linux 4.14.0-3-amd64 vhci_hcd [ 115.914004] usb usb9: SerialNumber: vhci_hcd.2 [ 115.914237] hub 9-0:1.0: USB hub found [ 115.914251] hub 9-0:1.0: 31 ports detected [ 115.914914] vhci_hcd vhci_hcd.2: USB/IP Virtual Host Controller [ 115.914918] vhci_hcd vhci_hcd.2: new USB bus registered, assigned bus number 10 [ 115.914948] usb usb10: We don't know the algorithms for LPM for this host, disabling LPM. [ 115.914989] usb usb10: New USB device found, idVendor=1d6b, idProduct=0003 [ 115.914992] usb usb10: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 115.914994] usb usb10: Product: USB/IP Virtual Host Controller [ 115.914996] usb usb10: Manufacturer: Linux 4.14.0-3-amd64 vhci_hcd [ 115.914998] usb usb10: SerialNumber: vhci_hcd.2 [ 115.915245] hub 10-0:1.0: USB hub found [ 115.915258] hub 10-0:1.0: config failed, hub has too many ports! (err -19) [ 115.915501] vhci_hcd vhci_hcd.3: USB/IP Virtual Host Controller [ 115.915504] vhci_hcd vhci_hcd.3: new USB bus registered, assigned bus number 11 [ 115.915559] usb usb11: New USB device found, idVendor=1d6b, idProduct=0002 [ 115.915562] usb usb11: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 115.915564] usb usb11: Product: USB/IP Virtual Host Controller [ 115.915567] usb usb11: Manufacturer: Linux 4.14.0-3-amd64 vhci_hcd [ 115.915569] usb usb11: SerialNumber: vhci_hcd.3 [ 115.915796] hub 11-0:1.0: USB hub found [ 115.915809] hub 11-0:1.0: 31 ports detected [ 115.916752] vhci_hcd vhci_hcd.3: USB/IP Virtual Host Controller [ 115.916756] vhci_hcd vhci_hcd.3: new USB bus registered, assigned bus number 12 [ 115.916785] usb usb12: We don't know the algorithms for LPM for this host, disabling LPM. [ 115.916828] usb usb12: New USB device found, idVendor=1d6b, idProduct=0003 [ 115.916831] usb usb12: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 115.916833] usb usb12: Product: USB/IP Virtual Host Controller [ 115.916836] usb usb12: Manufacturer: Linux 4.14.0-3-amd64 vhci_hcd [ 115.916838] usb usb12: SerialNumber: vhci_hcd.3 [ 115.917042] hub 12-0:1.0: USB hub found [ 115.917054] hub 12-0:1.0: config failed, hub has too many ports! (err -19) [ 115.917309] vhci_hcd vhci_hcd.4: USB/IP Virtual Host Controller [ 115.917312] vhci_hcd vhci_hcd.4: new USB bus registered, assigned bus number 13 [ 115.917372] usb usb13: New USB device found, idVendor=1d6b, idProduct=0002 [ 115.917374] usb usb13: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 115.917376] usb usb13: Product: USB/IP Virtual Host Controller [ 115.917378] usb usb13: Manufacturer: Linux 4.14.0-3-amd64 vhci_hcd [ 115.917380] usb usb13: SerialNumber: vhci_hcd.4 [ 115.917548] hub 13-0:1.0: USB hub found [ 115.917553] hub 13-0:1.0: 31 ports detected [ 115.917943] vhci_hcd vhci_hcd.4: USB/IP Virtual Host Controller [ 115.917944] vhci_hcd vhci_hcd.4: new USB bus registered, assigned bus number 14 [ 115.917953] usb usb14: We don't know the algorithms for LPM for this host, disabling LPM. [ 115.917966] usb usb14: New USB device found, idVendor=1d6b, idProduct=0003 [ 115.917966] usb usb14: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 115.917967] usb usb14: Product: USB/IP Virtual Host Controller [ 115.917967] usb usb14: Manufacturer: Linux 4.14.0-3-amd64 vhci_hcd [ 115.917968] usb usb14: SerialNumber: vhci_hcd.4 [ 115.918049] hub 14-0:1.0: USB hub found [ 115.918053] hub 14-0:1.0: config failed, hub has too many ports! (err -19) [ 115.918134] vhci_hcd vhci_hcd.5: USB/IP Virtual Host Controller [ 115.918135] vhci_hcd vhci_hcd.5: new USB bus registered, assigned bus number 15 [ 115.918149] usb usb15: New USB device found, idVendor=1d6b, idProduct=0002 [ 115.918150] usb usb15: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 115.918150] usb usb15: Product: USB/IP Virtual Host Controller [ 115.918151] usb usb15: Manufacturer: Linux 4.14.0-3-amd64 vhci_hcd [ 115.918151] usb usb15: SerialNumber: vhci_hcd.5 [ 115.918206] hub 15-0:1.0: USB hub found [ 115.918209] hub 15-0:1.0: 31 ports detected [ 115.918585] vhci_hcd vhci_hcd.5: USB/IP Virtual Host Controller [ 115.918587] vhci_hcd vhci_hcd.5: new USB bus registered, assigned bus number 16 [ 115.918600] usb usb16: We don't know the algorithms for LPM for this host, disabling LPM. [ 115.918616] usb usb16: New USB device found, idVendor=1d6b, idProduct=0003 [ 115.918617] usb usb16: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 115.918618] usb usb16: Product: USB/IP Virtual Host Controller [ 115.918619] usb usb16: Manufacturer: Linux 4.14.0-3-amd64 vhci_hcd [ 115.918620] usb usb16: SerialNumber: vhci_hcd.5 [ 115.918701] hub 16-0:1.0: USB hub found [ 115.918706] hub 16-0:1.0: config failed, hub has too many ports! (err -19) [ 115.918909] vhci_hcd vhci_hcd.6: USB/IP Virtual Host Controller [ 115.918910] vhci_hcd vhci_hcd.6: new USB bus registered, assigned bus number 17 [ 115.919003] usb usb17: New USB device found, idVendor=1d6b, idProduct=0002 [ 115.919004] usb usb17: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 115.919005] usb usb17: Product: USB/IP Virtual Host Controller [ 115.919006] usb usb17: Manufacturer: Linux 4.14.0-3-amd64 vhci_hcd [ 115.919007] usb usb17: SerialNumber: vhci_hcd.6 [ 115.919143] hub 17-0:1.0: USB hub found [ 115.919150] hub 17-0:1.0: 31 ports detected [ 115.919584] vhci_hcd vhci_hcd.6: USB/IP Virtual Host Controller [ 115.919586] vhci_hcd vhci_hcd.6: new USB bus registered, assigned bus number 18 [ 115.919598] usb usb18: We don't know the algorithms for LPM for this host, disabling LPM. [ 115.919616] usb usb18: New USB device found, idVendor=1d6b, idProduct=0003 [ 115.919617] usb usb18: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 115.919618] usb usb18: Product: USB/IP Virtual Host Controller [ 115.919619] usb usb18: Manufacturer: Linux 4.14.0-3-amd64 vhci_hcd [ 115.919620] usb usb18: SerialNumber: vhci_hcd.6 [ 115.919717] hub 18-0:1.0: USB hub found [ 115.919723] hub 18-0:1.0: config failed, hub has too many ports! (err -19) [ 115.919861] vhci_hcd vhci_hcd.7: USB/IP Virtual Host Controller [ 115.919862] vhci_hcd vhci_hcd.7: new USB bus registered, assigned bus number 19 [ 115.919888] usb usb19: New USB device found, idVendor=1d6b, idProduct=0002 [ 115.919890] usb usb19: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 115.919891] usb usb19: Product: USB/IP Virtual Host Controller [ 115.919891] usb usb19: Manufacturer: Linux 4.14.0-3-amd64 vhci_hcd [ 115.919892] usb usb19: SerialNumber: vhci_hcd.7 [ 115.920008] hub 19-0:1.0: USB hub found [ 115.920014] hub 19-0:1.0: 31 ports detected [ 115.920615] vhci_hcd vhci_hcd.7: USB/IP Virtual Host Controller [ 115.920617] vhci_hcd vhci_hcd.7: new USB bus registered, assigned bus number 20 [ 115.920636] usb usb20: We don't know the algorithms for LPM for this host, disabling LPM. [ 115.920657] usb usb20: New USB device found, idVendor=1d6b, idProduct=0003 [ 115.920658] usb usb20: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 115.920659] usb usb20: Product: USB/IP Virtual Host Controller [ 115.920660] usb usb20: Manufacturer: Linux 4.14.0-3-amd64 vhci_hcd [ 115.920661] usb usb20: SerialNumber: vhci_hcd.7 [ 115.920809] hub 20-0:1.0: USB hub found [ 115.920818] hub 20-0:1.0: config failed, hub has too many ports! (err -19)
