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

On 11.09.2013 14:53, Ankit Agarwal wrote:

On Sun, Sep 8, 2013 at 8:27 PM, Daniel Mack <zonque@gmail.com mailto:zonque@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