[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 #14 from Ferry Toth (ferry.toth@xxxxxxxxxxxx) ---
I see. I was misled by ? hub_activate, and  hub_activate calling
usb_submit_urb.

In any case the traces then show the problem is likely reproducible using any
hub.

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