DWC OTG HCD URB Error with Terratec Aureon USB soundcard

[arthurbennis]

This is my Terratec Aureon soundcard:

Jan  1 00:00:13 raspberrypi kernel: usb 1-1.2: Product: USB PnP Sound Device
Jan  1 00:00:13 raspberrypi kernel: usb 1-1.2: Manufacturer: C-Media Electronics Inc.      
Jan  1 00:00:13 raspberrypi kernel: input: C-Media Electronics Inc.       USB PnP Sound Device as /devices/platform/bcm2708_usb/usb1/1-1/1-1.2/1-1.2:1.3/input/input0
Jan  1 00:00:13 raspberrypi kernel: generic-usb 0003:0CCD:0077.0001: input: USB HID v1.00 Device [C-Media Electronics Inc.       USB PnP Sound Device] on usb-bcm2708_usb-1.2/input3
Jan  1 00:00:13 raspberrypi kernel: usbcore: registered new interface driver snd-usb-audio

The kernel crashes when using pyo with portaudio through this soundcard under Python. Because this is a custom compiled application I search a way to mimic this behaviour. The kernel also crashes on the same bug when playing a mp3 with mpg123 and aborting after a few seconds:

May 13 20:22:12 raspberrypi kernel: ERROR::dwc_otg_hcd_urb_dequeue:525: **** DWC OTG HCD URB Dequeue has NULL URB
May 13 20:22:12 raspberrypi kernel:
May 13 20:22:12 raspberrypi kernel: ------------[ cut here ]------------
May 13 20:22:12 raspberrypi kernel: WARNING: at lib/kref.c:34 0xc0194350()
May 13 20:22:12 raspberrypi kernel: Modules linked in: fuse snd_usb_audio snd_pcm snd_page_alloc snd_hwdep snd_usbmidi_lib snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_timer snd_seq_device snd evdev
May 13 20:22:12 raspberrypi kernel: Backtrace: 
May 13 20:22:12 raspberrypi kernel: Function entered at [<c0011a7c>] from [<c03043a4>]
May 13 20:22:12 raspberrypi kernel: r6:00000022 r5:c0194350 r4:00000000 r3:c03a4fa4
May 13 20:22:12 raspberrypi kernel: Function entered at [<c030438c>] from [<c001ed28>]
May 13 20:22:12 raspberrypi kernel: Function entered at [<c001ecd4>] from [<c001ed64>]
May 13 20:22:12 raspberrypi kernel: r8:00000001 r7:c78923a0 r6:c7922eb0 r5:c7922ea0 r4:c7b5b760
May 13 20:22:12 raspberrypi kernel: r3:00000009
May 13 20:22:12 raspberrypi kernel: Function entered at [<c001ed40>] from [<c0194350>]
May 13 20:22:12 raspberrypi kernel: Function entered at [<c0194310>] from [<c020b15c>]
May 13 20:22:12 raspberrypi kernel: r4:c7b5b760 r3:00000000
May 13 20:22:12 raspberrypi kernel: Function entered at [<c020b144>] from [<c020a4e0>]
May 13 20:22:12 raspberrypi kernel: r4:c7b5b760 r3:00000000
May 13 20:22:12 raspberrypi kernel: Function entered at [<c020a42c>] from [<c020c850>]
May 13 20:22:12 raspberrypi kernel: r7:c7921000 r6:00000001 r5:c7922ea0 r4:c7921000
May 13 20:22:12 raspberrypi kernel: Function entered at [<c020c7f8>] from [<c020c8c4>]
May 13 20:22:12 raspberrypi kernel: r6:c7922dc4 r5:00000000 r4:00000000 r3:c7922ea0
May 13 20:22:12 raspberrypi kernel: Function entered at [<c020c880>] from [<c020cee0>]
May 13 20:22:12 raspberrypi kernel: r8:c78923a0 r7:00000001 r6:00000000 r5:00000000 r4:c7921000
May 13 20:22:12 raspberrypi kernel: r3:00000001
May 13 20:22:12 raspberrypi kernel: Function entered at [<c020cd80>] from [<bf05c08c>]
May 13 20:22:12 raspberrypi kernel: Function entered at [<bf05c04c>] from [<bf05c0ec>]
May 13 20:22:12 raspberrypi kernel: r6:c7a72908 r5:c6de31a0 r4:c7b5bb60 r3:bf05c0d4
May 13 20:22:12 raspberrypi kernel: Function entered at [<bf05c0d4>] from [<bf046f1c>]
May 13 20:22:12 raspberrypi kernel: Function entered at [<bf046ec0>] from [<bf046fa0>]
May 13 20:22:12 raspberrypi kernel: r5:c6de31a0 r4:c7a72800
May 13 20:22:12 raspberrypi kernel: Function entered at [<bf046f70>] from [<c008014c>]
May 13 20:22:12 raspberrypi kernel: r8:c6de31a8 r7:00000008 r6:c74f83b8 r5:c7bfd908 r4:c6de31a0
May 13 20:22:12 raspberrypi kernel: r3:bf046f70
May 13 20:22:12 raspberrypi kernel: Function entered at [<c0080094>] from [<c007d0e0>]
May 13 20:22:12 raspberrypi kernel: Function entered at [<c007d070>] from [<c007d190>]
May 13 20:22:12 raspberrypi kernel: r6:0077e1b0 r5:00000001 r4:00000027 r3:00000003
May 13 20:22:12 raspberrypi kernel: Function entered at [<c007d0f8>] from [<c000e220>]
May 13 20:22:12 raspberrypi kernel: r5:00774008 r4:00774008
May 13 20:22:12 raspberrypi kernel: ---[ end trace f1d082aa36270715 ]---

Latest github kernel and modules.

[popcornmix]

Are you using the kernel from latest debian image? Or github?

[arthurbennis]

Retested with the latest debian and the github kernel. Both kernels show the same behaviour.

[popcornmix]

There is a potential fix for this now in kernel source and prebuilt firmware. Can you test it?

[arthurbennis]

In the latest 3.2.17 kernel as packaged by bootc (http://www.bootc.net/), the problem when playing and aborting an mp3 via mpg123 over USB audio seems to be fixed. Will investigate further into original issue after compiling pyo.

[popcornmix]

I believe this is fixed in latest firmware. Please reopen if there is a problem.