[alsa-devel] snd_usb_usx2y holding onto a lock?

[Takashi Iwai]

On Sun, 19 Aug 2018 22:27:19 +0200,
Joseph Spencer wrote:
> 
> Thanks for the reply!  I've been pouring over the source.  Looks like it
> really hasn't been actively maintained since around 2005, mostly minor
> refactoring since then.
> 
> If I have questions that the docs available online can't answer, would this
> be a good place to ask?

Unfortunately I also have no technical information about this piece of
hardware.  The best would be to ask the original author, Karsten
Wiese, but I'm not sure whether the address in the code still
valid...


Takashi

> 
> I appreciate all the work you guys do!
> Joe Spencer
> 602.777.2307
> 
> 
> On Sun, Aug 19, 2018 at 1:08 AM Takashi Iwai <tiwai at suse.de> wrote:
> 
> > On Fri, 17 Aug 2018 09:23:35 +0200,
> > Joseph Spencer wrote:
> > >
> > > When plugging an audio interface in with nomodeset I see the following in
> > > the logs:
> > >
> > > Aug 08 23:19:23 localhost.localdomain kernel: INFO: task pulseaudio:1750
> > > blocked for more than 120 seconds.
> > > Aug 08 23:19:23 localhost.localdomain kernel:       Tainted: G
> > >  OE     4.17.11-200.fc28.x86_64+debug #1
> > > Aug 08 23:19:23 localhost.localdomain kernel: "echo 0 >
> > > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > > Aug 08 23:19:23 localhost.localdomain kernel: pulseaudio      D12408
> > 1750
> > >  1268 0x00000000
> > > Aug 08 23:19:23 localhost.localdomain kernel: Call Trace:
> > >
> > > Aug 08 23:19:23 localhost.localdomain kernel:  ? __schedule+0x2ba/0xaf0
> > >
> > > Aug 08 23:19:23 localhost.localdomain kernel:  ?
> > > prepare_to_wait_event+0xd2/0x180
> > > Aug 08 23:19:23 localhost.localdomain kernel:  schedule+0x2f/0x90
> > >
> > > Aug 08 23:19:23 localhost.localdomain kernel:
> > usX2Y_urbs_start+0x208/0x470
> > > [snd_usb_usx2y]
> > > Aug 08 23:19:23 localhost.localdomain kernel:  ? finish_wait+0x80/0x80
> > (snip)
> >
> > So this is waiting for the event to be triggered by the urb
> > completion, but it didn't happen by some reason on your machine.
> >
> > > The audio interface doesn't work and without nomodeset X freezes.
> > >
> > > Any help pointing me in the right direction would be greatly appreciated.
> > > It looks like an issue with the snd_usb_usx2y driver to me, but I'm not
> > > sure.
> >
> > Unfortunately the driver is very special and does somewhat magical way
> > only the author knows of well.
> > You need to follow the code, and at least check whether the urb
> > submission at the playback start worked properly as expected.
> >
> >
> > Takashi
> >
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