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Hello,
i have a Windows 10 Pro x64 host with a Ubuntu 16.04 x64 guest and problems with usb.
There is a usb 2.0 hub connected to a usb 2.0 port on host with some smarthome usb transceivers, but when i choose ehci in VBox, Ubuntu is using ohci and i got usb errors in dmesg.
So i select xhci, then Ubuntu is using ehci with no errors at boot, but after some time i get this

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[So Sep 18 23:35:31 2016] xhci_hcd 0000:00:0c.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 0 comp_code 1
[So Sep 18 23:35:31 2016] xhci_hcd 0000:00:0c.0: Looking for event-dma 0000000035528630 trb-start 0000000035b670a0 trb-end 0000000035b670c0 seg-start 0000000035b67000 seg-end 0000000035b67ff0
[So Sep 18 23:35:36 2016] ftdi_sio ttyUSB1: failed to get modem status: -110
[Mo Sep 19 06:06:24 2016] xhci_hcd 0000:00:0c.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 2 comp_code 13
[Mo Sep 19 06:06:24 2016] xhci_hcd 0000:00:0c.0: Looking for event-dma 000000003551fe90 trb-start 000000003551fe80 trb-end 000000003551fe80 seg-start 000000003551f000 seg-end 000000003551fff0

and then some transceivers fails to ACK packets.
When i reboot the guest, everything is fine again until the errors come back.

I've disabled every energy saving option on host i found, on the guest i did GRUB_CMDLINE_LINUX_DEFAULT="quiet splash usbcore.autosuspend=-1".
I'm running out of ideas, please help me.
Thanks!

Not really an expert, but here are a couple of ideas that popped up:

What happens if you remove the hub from the equation?
You seem to have checked the guests settings for power off/suspension. What about the settings on the host?
"...but after some time...". Is this time sort of fixed? What are the messages in the VBox.log at the same time?

Searching for you error shows a lot of OS bug reports ERROR Transfer event TRB DMA ptr not part of current TD ep_index 2 comp_code 13. Not always a VirtualBox problem.

The first question is why ehci fails (in guest fallback to ohci).
I can't disconnect the hub because all devices connected to that.
The Virtualbox Image is created from a fully working physical system, there was no problems at all.
My current test: System started 20:55

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[Mo Sep 19 20:55:18 2016] IPv6: ADDRCONF(NETDEV_CHANGE): enp0s3: link becomes ready
[Mo Sep 19 20:56:01 2016] ttyUSB1: 1 input overrun(s)
[Mo Sep 19 23:10:34 2016] xhci_hcd 0000:00:0c.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 0 comp_code 1
[Mo Sep 19 23:10:34 2016] xhci_hcd 0000:00:0c.0: Looking for event-dma 0000000035be4790 trb-start 0000000035089230 trb-end 0000000035089250 seg-start 0000000035089000 seg-end 0000000035089ff0
[Mo Sep 19 23:10:39 2016] ftdi_sio ttyUSB2: failed to get modem status: -110
[Di Sep 20 00:00:59 2016] xhci_hcd 0000:00:0c.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 2 comp_code 13
[Di Sep 20 00:00:59 2016] xhci_hcd 0000:00:0c.0: Looking for event-dma 0000000035bd4310 trb-start 0000000035bd4300 trb-end 0000000035bd4300 seg-start 0000000035bd4000 seg-end 0000000035bd4ff0

The VBox.log change date is at 21:05 so maybe there is nothing...

Edit:
Ok the VBoxSVC.log looks difficult.
I think its a usb 3.0 problem, so why i can't use 2.0 instead?
Its only using ohci when i choose ehci look:

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/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ohci-pci/12p, 12M
    |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 2: Dev 3, If 0, Class=Communications, Driver=cdc_acm, 12M
    |__ Port 2: Dev 3, If 1, Class=CDC Data, Driver=cdc_acm, 12M
    |__ Port 3: Dev 4, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 12M
    |__ Port 4: Dev 5, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 12M
    |__ Port 5: Dev 6, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 12M
    |__ Port 6: Dev 7, If 0, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 6: Dev 7, If 1, Class=Human Interface Device, Driver=, 12M
    |__ Port 7: Dev 8, If 0, Class=Vendor Specific Class, Driver=ch341, 12M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/12p, 480M

Edit2:
Ok my fault, i added a usb stick and its using ehci

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/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ohci-pci/12p, 12M
    |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 2: Dev 3, If 0, Class=Human Interface Device, Driver=, 12M
    |__ Port 3: Dev 4, If 0, Class=Communications, Driver=cdc_acm, 12M
    |__ Port 3: Dev 4, If 1, Class=CDC Data, Driver=cdc_acm, 12M
    |__ Port 4: Dev 5, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 12M
    |__ Port 5: Dev 6, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 12M
    |__ Port 6: Dev 7, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 12M
    |__ Port 7: Dev 8, If 0, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 7: Dev 8, If 1, Class=Human Interface Device, Driver=, 12M
    |__ Port 8: Dev 9, If 0, Class=Vendor Specific Class, Driver=ch341, 12M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/12p, 480M
    |__ Port 1: Dev 2, If 0, Class=Mass Storage, Driver=usb-storage, 480M

Now its looking like that:

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[Di Sep 20 10:21:46 2016] usb 2-7: New USB device found, idVendor=0c45, idProduct=7402
[Di Sep 20 10:21:46 2016] usb 2-7: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[Di Sep 20 10:21:46 2016] usb 2-7: Product: TEMPERHUM1V1.3
[Di Sep 20 10:21:46 2016] usb 2-7: Manufacturer: RDing
[Di Sep 20 10:21:46 2016] input: RDing TEMPERHUM1V1.3 as /devices/pci0000:00/0000:00:06.0/usb2/2-7/2-7:1.0/0003:0C45:7402.0003/input/input9
[Di Sep 20 10:21:46 2016] hid-generic 0003:0C45:7402.0003: input,hidraw2: USB HID v1.10 Keyboard [RDing TEMPERHUM1V1.3] on usb-0000:00:06.0-7/input0
[Di Sep 20 10:21:46 2016] hid-generic 0003:0C45:7402.0004: hiddev0,hidraw3: USB HID v1.10 Device [RDing TEMPERHUM1V1.3] on usb-0000:00:06.0-7/input1
[Di Sep 20 10:21:46 2016] usb 2-8: new full-speed USB device number 9 using ohci-pci
[Di Sep 20 10:21:46 2016] usb 2-8: New USB device found, idVendor=1a86, idProduct=7523
[Di Sep 20 10:21:46 2016] usb 2-8: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[Di Sep 20 10:21:46 2016] usb 2-8: Product: USB2.0-Serial
[Di Sep 20 10:21:46 2016] cdc_acm 2-3:1.0: ttyACM0: USB ACM device
[Di Sep 20 10:21:46 2016] usbcore: registered new interface driver cdc_acm
[Di Sep 20 10:21:46 2016] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
[Di Sep 20 10:21:46 2016] usbcore: registered new interface driver usbserial
[Di Sep 20 10:21:46 2016] usbcore: registered new interface driver usbserial_generic
[Di Sep 20 10:21:46 2016] usbserial: USB Serial support registered for generic
[Di Sep 20 10:21:46 2016] usbcore: registered new interface driver ftdi_sio
[Di Sep 20 10:21:46 2016] usbserial: USB Serial support registered for FTDI USB Serial Device
[Di Sep 20 10:21:46 2016] ftdi_sio 2-4:1.0: FTDI USB Serial Device converter detected
[Di Sep 20 10:21:46 2016] usb 2-4: Detected FT232RL
[Di Sep 20 10:21:46 2016] usbcore: registered new interface driver ch341
[Di Sep 20 10:21:46 2016] usbserial: USB Serial support registered for ch341-uart
[Di Sep 20 10:21:46 2016] usb 2-4: FTDI USB Serial Device converter now attached to ttyUSB0
[Di Sep 20 10:21:46 2016] ftdi_sio 2-5:1.0: FTDI USB Serial Device converter detected
[Di Sep 20 10:21:46 2016] usb 2-5: Detected FT232RL
[Di Sep 20 10:21:46 2016] usb 2-5: FTDI USB Serial Device converter now attached to ttyUSB2
[Di Sep 20 10:21:46 2016] ftdi_sio 2-6:1.0: FTDI USB Serial Device converter detected
[Di Sep 20 10:21:46 2016] usb 2-6: Detected FT232RL
[Di Sep 20 10:21:46 2016] usb 2-6: FTDI USB Serial Device converter now attached to ttyUSB3
[Di Sep 20 10:21:46 2016] usb 2-8: ch341-uart converter now attached to ttyUSB1
[Di Sep 20 10:22:19 2016] ftdi_sio ttyUSB3: usb_serial_generic_read_bulk_callback - urb stopped: -32
[Di Sep 20 10:22:23 2016] ttyUSB2: 1 input overrun(s)
[Di Sep 20 10:22:24 2016] ftdi_sio ttyUSB3: usb_serial_generic_read_bulk_callback - urb stopped: -32
[Di Sep 20 10:22:26 2016] ftdi_sio ttyUSB2: usb_serial_generic_read_bulk_callback - urb stopped: -32
[Di Sep 20 10:23:26 2016] ftdi_sio ttyUSB3: usb_serial_generic_read_bulk_callback - urb stopped: -32
[Di Sep 20 10:23:29 2016] ftdi_sio ttyUSB2: usb_serial_generic_read_bulk_callback - urb stopped: -32
[Di Sep 20 10:23:32 2016] ftdi_sio ttyUSB0: usb_serial_generic_read_bulk_callback - urb stopped: -32
[Di Sep 20 10:24:44 2016] ch341-uart ttyUSB1: usb_serial_generic_read_bulk_callback - urb stopped: -32

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