On Tue, 6 Dec 2016, PrasannaKumar Muralidharan wrote:

> > The issue did not appear for a day with 4.9-rc5. Will check for a
> > couple more days and get back.
> 
> I have been running 4.9-rc5 for quite some time. Did not observe the
> crash so far but some times my USB port stops recognising the device.
> After rebooting the system the USB port starts working.
> 
> No OOPS or message related to this appeared in dmesg output. Is there
> a way to collect more info?

You can turn on dynamic debugging for USB:

        echo 'module usbcore =p' >/sys/kernel/debug/dynamic_debug/control

Alan Stern

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