[alsa-devel] ultra small alsa library

Takashi Iwai tiwai at suse.de
Tue Aug 5 12:14:07 CEST 2008

At Sat, 2 Aug 2008 22:34:22 +0200,
Marco Schuster wrote:
> The problem I have is:
> As soon as I try to play a mp3 via mpg123, in dmesg comes the following
> error:
> Division by zero in kernel.
> [<c0026e2c>] (dump_stack+0x0/0x14) from [<c0026e58>] (__div0+0x18/0x20)
> [<c0026e40>] (__div0+0x0/0x20) from [<c011c65c>] (Ldiv0+0x8/0x10)
> [<bf0267ec>] (iso_stream_find+0x0/0x340 [ehci_hcd]) from [<bf028140>]
> (ehci_urb_enqueue+0x848/0xdf4 [ehci_hcd])
> [<bf0278f8>] (ehci_urb_enqueue+0x0/0xdf4 [ehci_hcd]) from [<bf005228>]
> (usb_hcd_submit_urb+0x660/0x77c [usbcore])
> [<bf004bc8>] (usb_hcd_submit_urb+0x0/0x77c [usbcore]) from [<bf0057fc>]
> (usb_submit_urb+0x228/0x264 [usbcore])
> [<bf0055d4>] (usb_submit_urb+0x0/0x264 [usbcore]) from [<bf1c2820>]
> (start_urbs+0x1cc/0x308 [snd_usb_audio])
>  r6:00000000 r5:c0c2dc10 r4:00000010
> [<bf1c2654>] (start_urbs+0x0/0x308 [snd_usb_audio]) from [<bf1c4d78>]
> (snd_usb_pcm_prepare+0xa4/0xb8 [snd_usb_audio])
>  r7:00000000 r6:00000000 r5:c0c2b800 r4:c0c2dc10
> [<bf1c4cd4>] (snd_usb_pcm_prepare+0x0/0xb8 [snd_usb_audio]) from
> [<bf19bdc4>] (snd_pcm_do_prepare+0x1c/0x3c [snd_pcm])
>  r6:00000802 r5:c13d02c0 r4:c13d02c0
> [<bf19bda8>] (snd_pcm_do_prepare+0x0/0x3c [snd_pcm]) from [<bf19b96c>]
> (snd_pcm_action_single+0x40/0x7c [snd_pcm])
>  r4:bf1acd74
> [<bf19b92c>] (snd_pcm_action_single+0x0/0x7c [snd_pcm]) from [<bf19c774>]
> (snd_pcm_action_nonatomic+0x58/0x70 [snd_pcm])
>  r7:00044930 r6:bf1acd74 r5:00000802 r4:c13d02c0
> [<bf19c71c>] (snd_pcm_action_nonatomic+0x0/0x70 [snd_pcm]) from [<bf19eba8>]
> (snd_pcm_common_ioctl1+0x664/0xf7c [snd_pcm])
>  r6:c13d02c0 r5:00044930 r4:00044930
> [<bf19e544>] (snd_pcm_common_ioctl1+0x0/0xf7c [snd_pcm]) from [<bf19fe18>]
> (snd_pcm_playback_ioctl1+0x48c/0x4b0 [snd_pcm])
> [<bf19f98c>] (snd_pcm_playback_ioctl1+0x0/0x4b0 [snd_pcm]) from [<bf19ff20>]
> (snd_pcm_playback_ioctl+0x34/0x40 [snd_pcm])
> [<bf19feec>] (snd_pcm_playback_ioctl+0x0/0x40 [snd_pcm]) from [<c0097e70>]
> (do_ioctl+0x34/0x78)
> [<c0097e3c>] (do_ioctl+0x0/0x78) from [<c0098114>] (vfs_ioctl+0x260/0x290)
>  r5:00044930 r4:c0fbcbc0
> [<c0097eb4>] (vfs_ioctl+0x0/0x290) from [<c009819c>] (sys_ioctl+0x58/0x78)
>  r7:00004140 r6:c0fbcbc0 r5:00044930 r4:00000000
> [<c0098144>] (sys_ioctl+0x0/0x78) from [<c0022de0>]
> (ret_fast_syscall+0x0/0x2c)
>  r8:c0022f84 r7:00000036 r6:beebb3a0 r5:beebb708 r4:00043598
> Can anyone point me what goes wrong here?
> Kernel is debian  2.6.24-1-ixp4xx (armv5tel).

According to the stack trace, this looks like a bug in ehci driver.
Better to ask on linux-usb ML.


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