Re: [Spca50x-devs] [BUG] kernel stall in spca50x driver - reopened

[thomas schorpp <t.schorpp@xxxxxx>]

thomas schorpp wrote:
> thomas schorpp wrote:
> 
>>thomas schorpp wrote:
>>
>>
>>>thomas schorpp wrote:
>>>
>>>
>>>
>>>>thomas schorpp wrote:
>>>>
>>>>
>>>>
>>>>
>>>>>hello,
>>>>>
>>>>>touching ekiga gui video sliders triggers spurious stalls of 2.6 kernels.
>>>>>
>>>>>any clue? it occours more often on touching the contrast slider.
>>>>>color and hue seems not to be affected.
>>>>>usb seems not affected - no stall until touching sliders.
>>>>>
>>>>>this will be hard to debug since there will be no kernel oops and 
>>>>>no logs on serial cable console too.
>>>>>the kernel seems to lock up in a endless loop somewhere.
>>>>>
>>>>>2.6.15.0 K7 kernel.org
>>>>>aiptek dv3500 webcam mode
>>>>>ekiga cvs + libs cvs
>>>>>
>>>>>y
>>>>>tom
>>>>>
>>>>
>>>>
>>>>any grabber triggers.
>>>>
>>>>the stall seems to occur if light gets too dark (black picture).
>>>>
>>>
>>>no also occurs on picture change.
>>>
>>>
>>>
>>>
>>>>here are debug logs until deadlock (serial console gets no oops, even only once so far flashing keyboard lights):
>>>>
>>>>
>>
>>
>>news:
>>
>>its not the spca driver.
>>
>>i connected to another usb plug and all is fine again.
>>
>>seems like a bug in the 2.6.15 kernel usb drivers:
>>
> 
> 
> it was a bug in kernel 2.6.15.x. 
> 
> fixed in 2.6.15.5.
> 
> all fine again.
> 

reopened. occurred again with 2.6.15.6 kernel and spca5xxx 3/1/2006

on fast and big brightness change.
sometimes on black picture (low light).
this points to a bug im picture-processing, maybe spcadecoder.
i cant see anything unusual in the interrupt handler. 

full kernel stall.

debugfs is useless here. no access under stalled kernel, 
i dont know if mounting to nfs mounted fs is possible.

trying again with serial console kernel debugging and step tracing.

y
tom





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