[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 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.

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


Daniel