We are having an issue with self-powered USB hubs on our custom, Sama5D4-based board.
If we plug the board to hubs which are not themselves connected to a host, we often get flooded with "ODD" log messages (https://github.com/linux4sam/linux-at91 ... d45758abd3 - we are still using the 4.4 branch). Contrary to the comment, this is not exactly harmless because those messages can greatly delay the Linux boot-up sequence (journald apparently can't cope with that many messages).
This does not happen with non self-powered hubs.
If I understand the code correctly, these messages are caused by "ENDRESET" interrupts. I'd like to confirm this interrupt correspond to the section 18.104.22.168 Reset signaling of the USB 1.1 specification:
I suspect an electric problem around D+ and D- that causes the USB subsystem to see a reset condition.A hub signals reset to a downstream port by driving an extended SE0 at the port. After the reset is
removed, the device will be in the Default state (refer to Section 9.1).