On Mon, 16 May 2016, Brian T. McKee wrote: > I sent a message to the group yesterday, but I suspect it was too big > for it's own good and didn't make it to the list. It did; I saw it. > I'm attempting to debug a USB problem where multiple UVC camera causes > the USB driver to crash and shut down. All *HCI devices stop working. If you could post a dmesg log showing how this happens, it might help. > I managed to get a USB serial port up and running on my laptop and > connect it to an old machine with a built in serial port, as an attempt > to get KGDB running, but alas, KGDB does not recognize /dev/ttyUSB0 as a > valid device. > > It looks like KGDB does not support the EHCI debug cable anymore, It should. If it doesn't, it's a regression. > although a crossover cable is available if that becomes an option. > > Can someone in the group advise me on how to debug this issue? I was > hoping to get a back trace for you guys... Have you considered logging in over the network? What exactly do you want to learn? kgdb may not be the best way of learning it. The log in your previous message wasn't very intelligible. You had too many debug options turned on, which is almost as bad as not having enough. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
