[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 at gmail.com
> > <mailto:zonque at gmail.com>> 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