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List:       linux-usb-devel
Subject:    [linux-usb-devel] [Fwd: Re: [Spca50x-devs] [BUG]  kernel stall in spca50x driver  -
From:       thomas schorpp <t.schorpp () gmx ! de>
Date:       2006-03-10 0:44:07
Message-ID: 4410CBD7.1040706 () gmx ! de
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-------- Original Message --------
Subject: Re: [Spca50x-devs] [BUG]  kernel stall in spca50x driver  - reopened
Date: Fri, 10 Mar 2006 01:27:27 +0100
From: thomas schorpp <t.schorpp@gmx.de>
Reply-To: t.schorpp@gmx.de
To: spca50x-devs@lists.sourceforge.net
References: <43CF43CE.7060404@gmx.de> <43D126DF.4060603@gmx.de> \
<43D15232.7020100@gmx.de> <43E6620C.6040203@gmx.de> <4408265B.1070305@gmx.de>

> > > > > 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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