On Thu, 5 Mar 2020, [iso-8859-1] M� Rullg� wrote: > While trying to capture some USB traffic, this happened: > > 8<--- cut here --- > Unable to handle kernel paging request at virtual address ffeff000 ... > [<c069e0a8>] (memcpy) from [<c050c88c>] (mon_copy_to_buff+0x4c/0x6c) > [<c050c88c>] (mon_copy_to_buff) from [<c050cd2c>] (mon_bin_event+0x480/0x7b8) > [<c050cd2c>] (mon_bin_event) from [<c050ade4>] (mon_bus_complete+0x50/0x6c) ... > It is easily reproducible. What can I do to narrow down the cause? What kind of USB traffic were you monitoring? Isochronous? Scatter-gather? Can you add printk statements in drivers/usb/mon/mon_bin.c: mon_bin_get_data() to determine which of the pathways was used for calling mon_copy_buff() and what the values of the arguments were? Alan Stern
