[Bug 215740] kernel warning: DMA-API: xhci_hcd: cacheline tracking EEXIST, overlapping mappings aren't supported

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https://bugzilla.kernel.org/show_bug.cgi?id=215740

--- Comment #13 from Alan Stern (stern@xxxxxxxxxxxxxxxxxxx) ---
Those two stack traces are essentially the same as the first one reported. 
They all contain the following key sequence of function calls:

  dma_map_page_attrs
  usb_hcd_map_urb_for_dma
  usb_hcd_submit_urb
  usb_start_wait_urb
  usb_control_msg
  hub_ext_port_status
  hub_event
  process_one_work

It doesn't look like they add anything new.

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