Re: usb stuff breaks after unplugging usb audio dongle

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On Mon, Nov 07, 2016 at 08:06:41AM -0500, Dennis New wrote:
> So, I have a USB audio dongle (currently using ohci, but the same would
> probably happen with ehci), and if I stupidly decide to unplug it while
> I'm streaming audio (alsa) to it, mplayer (for example) first
> freezes ... and if I quit mplayer immediately, things are fine ... but
> if I try to continue playing (by unpausing/seeking), mplayer goes into
> an infinite loop of errors trying to write to the (alsa?) audio device,
> but more importantly, my kernel's (4.8.6) entire usb system seems to
> break ... I can't even properly load my ehci_pci kernel drivers (it is
> actually able to load them, but they can't be unloaded... they seem to
> get immediately hung too... even though the dongle was using ohci at the
> time) ... my alsa sound is also broken/hung so I no longer get
> audio ... I'm forced to reboot (and even here it can't power off, I
> have to force it with the PrtSc buttons).

If you are able to get any kind of kernel log message when you remove
the device, that would help out a lot in trying to track this issue
down.  Without that, it's going to be almost impossible, sorry...

thanks,

greg k-h
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