alsa crash with “ ALSA sound/usb/urb.c:179 cannot submit urb (err = -27)” on imx6q sabrelite

alsa crash with “ ALSA sound/usb/urb.c:179 cannot submit urb (err = -27)” on imx6q sabrelite

[Ankit Agarwal]

I am using alsa pcm player to listen to audio. The alsa pcm crashes with
the error: ALSA sound/usb/urb.c:179 cannot submit urb (err = -27). I am
able to hear the data initially but when other transaction begins on HID
report endpoint, alsa crashes with the mentioned error.

I am working on imx6q board with linux kernel-3.0.35. I am using Apple
device to get the digital audio.


-- 
Best Regards,
Ankit Agarwal

Re: alsa crash with “ ALSA sound/usb/urb.c:179 cannot submit urb (err = -27)” on imx6q sabrelite

[Daniel Mack]

On 02.09.2013 12:51, Ankit Agarwal wrote:
> I am using alsa pcm player to listen to audio. The alsa pcm crashes with
> the error: ALSA sound/usb/urb.c:179 cannot submit urb (err = -27). I am
> able to hear the data initially but when other transaction begins on HID
> report endpoint, alsa crashes with the mentioned error.

-27 == -EFBIG, which seems to relate to a scheduling problem on the bus,
and hence probably rather to a host controller bug than an issue with
snd-usb.

> I am working on imx6q board with linux kernel-3.0.35. I am using Apple
> device to get the digital audio.

Please try with a more recent kernel, and see if you can find the
location where EFBIG is initially reported.


Daniel

Re: [alsa-devel] alsa crash with “ ALSA sound/usb/urb.c:179 cannot submit urb (err = -27)” on imx6q sabrelite

[Daniel Mack]

On 11.09.2013 14:53, Ankit Agarwal wrote:
> 
> On Sun, Sep 8, 2013 at 8:27 PM, Daniel Mack <zonque-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
> <mailto:zonque-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>> wrote:
> 
>     On 02.09.2013 12:51, Ankit Agarwal wrote:
>     > I am using alsa pcm player to listen to audio. The alsa pcm
>     crashes with
>     > the error: ALSA sound/usb/urb.c:179 cannot submit urb (err = -27).
>     I am
>     > able to hear the data initially but when other transaction begins
>     on HID
>     > report endpoint, alsa crashes with the mentioned error.
> 
>     -27 == -EFBIG, which seems to relate to a scheduling problem on the bus,
>     and hence probably rather to a host controller bug than an issue with
>     snd-usb.
> 
>     > I am working on imx6q board with linux kernel-3.0.35. I am using Apple
>     > device to get the digital audio.
> 
>     Please try with a more recent kernel, and see if you can find the
>     location where EFBIG is initially reported.
> 
> 
> I have found that EFBIG is being reported by ehci-host controller. It is
> coming from file ehci-sched.c under iso_stream_schedule() function. The
> error is thrown when the controller tries to schedule the urb too far
> into the future, ie, there is overflow of the scheduled URBs. I might be
> happening because the URBs are not scheduled properly.

Ok. What about trying a newer kernel? The issue might be fixed already.

In any case, this does not seem related to snd-usb, so I copied the usb
list.


Daniel


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Re: [alsa-devel] alsa crash with “ ALSA sound/usb/urb.c:179 cannot submit urb (err = -27)” on imx6q sabrelite

[Alan Stern]

On Wed, 11 Sep 2013, Daniel Mack wrote:

> On 11.09.2013 14:53, Ankit Agarwal wrote:
> > 
> > On Sun, Sep 8, 2013 at 8:27 PM, Daniel Mack <zonque-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
> > <mailto:zonque-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>> wrote:
> > 
> >     On 02.09.2013 12:51, Ankit Agarwal wrote:
> >     > I am using alsa pcm player to listen to audio. The alsa pcm
> >     crashes with
> >     > the error: ALSA sound/usb/urb.c:179 cannot submit urb (err = -27).
> >     I am
> >     > able to hear the data initially but when other transaction begins
> >     on HID
> >     > report endpoint, alsa crashes with the mentioned error.
> > 
> >     -27 == -EFBIG, which seems to relate to a scheduling problem on the bus,
> >     and hence probably rather to a host controller bug than an issue with
> >     snd-usb.
> > 
> >     > I am working on imx6q board with linux kernel-3.0.35. I am using Apple
> >     > device to get the digital audio.
> > 
> >     Please try with a more recent kernel, and see if you can find the
> >     location where EFBIG is initially reported.
> > 
> > 
> > I have found that EFBIG is being reported by ehci-host controller. It is
> > coming from file ehci-sched.c under iso_stream_schedule() function. The
> > error is thrown when the controller tries to schedule the urb too far
> > into the future, ie, there is overflow of the scheduled URBs. I might be
> > happening because the URBs are not scheduled properly.
> 
> Ok. What about trying a newer kernel? The issue might be fixed already.

-EFBIG is still returned under the same circumstances as in earlier
kernels.  You can get more information about those errors if you enable
CONFIG_USB_DEBUG.

Starting in the 3.11 kernel, however, -EXDEV is no longer returned for
USB submission.  It would be a good idea to test with 3.11.  It also
would be a good idea to get a usbmon trace showing what happens when
the errors occur.

Alan Stern

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