Takashi Iwai said (on alsa-devel nailing list):

>>On Sun, 31 Aug 2003 14:30:38 -0700, Andrew Burgess wrote:
>> 
>> NULL pointer dereference
>> 
>> Trace; f09b16bf <[usb-ohci]dl_del_list+40f/460>
>> Trace; c0119619 <process_timeout+19/20>
>> Trace; f09b255b <[usb-ohci]hc_interrupt+10b/1a0>
>> Trace; c0109080 <handle_IRQ_event+60/a0>
>> Trace; c010929b <do_IRQ+8b/e0>
>> Trace; c0105420 <default_idle+0/40>
>> Trace; c010bd18 <call_do_IRQ+5/d>
>> Trace; c0105420 <default_idle+0/40>
>> Trace; c010544c <default_idle+2c/40>
>> Trace; c01054c2 <cpu_idle+42/60>
>> Trace; c011d42b <call_console_drivers+5b/120>
>> Trace; c011d607 <printk+a7/170>
>> 
>> I run:
>> 
>>   arecord -D imic --rate 44100 -f S16_LE - | aplay -
>> 
>> and then press ^C
>> 
>> I get:
>> 
>> A few URB timeouts the first time but the kernel stayed up.
>> Then the oops the 2nd time I ran it and a hard hang (had to use
>> a pencil for the backtrace :-).
>>
>> kernel 2.4.23-pre2 (because it has a new batch of USB patches)
>> alsa-cvs
>> dual athlon mb
>> Griffin iMic
>> Creative Soundblaster-Live!
> 
>it looks rather like a bug of usb-ohci driver...

So I post it here. If anyone would benefit, I could send you the
iMic to help debug this. Or I am at your service if I can help
from here...

Thank you very much
Andrew



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