On Tue, Jul 20, 2021 at 03:04:44PM +0000, Schmid, Carsten wrote: > Hi Mathias, > > i got a NULL pointer deref in the usbfs and analyzed it. > The connected device seemed to have trouble on USB transmissions. > However, I have the impression that there is a race between finishing URB handling and disconnection of devices. > In detail: > [ 4979.029666] xhci_hcd 0000:00:15.0: USB transfer error. Maybe the USB cable is bad? Did your cable die? And 4.14 is quite old, what about 5.13? thanks, greg k-h