Re: [linux-dvb] FusionHDTV7 and v4l causes kernel panic

[Andy Walls <awalls@radix.net>]

On Wed, 2009-03-18 at 19:16 -0700, Timothy D. Lenz wrote:
> I've added
>     console=ttyS0,115200 console=tty0
> to the kernel command line options and with out the console=tty0 part the dump no longer shows on the monitor, so redirect seems to
> work but loging the serial port on a second computer gets nothing. I tested the connection with echo and that worked but the kernel
> dump won't go out the port.  The last 2 lines of the screen are:
> 
> EIP: [<c012a8c6>] queue_work+0x3/0x68 SS:ESP 0068:f778dd24
> Kernel panic - not syncing: Fatal exception in interrupt

Hmm.  The only thing in the cx23885 driver that tries to schedule work,
and thus the only thing that could possibly pass in a bad argument, is
the netup_ci_slot_status() function.  It gets called when an IRQ comes
in indicating a GPIO[01] event, and the driver thinks the card is a
NetUp Dual DVB-S2 CI card.

That's consistent with the "fatal exception in interrupt", but without
the backtrace, one can't be completely sure this call to queue work was
initiated by the cx23885 driver and a problem with cx23885 data
structures.  (But it is the most likely scenario, IMO)
I just can't see how netup_ci_slot_status() get's called for your card.


> Any way to get the dump to go out the serial port?

Does 9600 baud help? (Just a guess.)

Regards,
Andy

> ----- Original Message ----- 
> From: "Andy Walls" <awalls@radix.net>
> To: "Timothy D. Lenz" <tlenz@vorgon.com>
> Cc: <linux-media@vger.kernel.org>
> Sent: Monday, March 16, 2009 6:07 PM
> Subject: Re: [linux-dvb] FusionHDTV7 and v4l causes kernel panic
> 
> 
> > On Mon, 2009-03-16 at 17:46 -0700, Timothy D. Lenz wrote:
> > > When it panics, there is no log, just a bunch of stuff that that scrolls fast on the main monitor then cold lock.
> > >  No way to scroll
> > > back.
> >
> > Not even Shift+PageUp ?
> >
> >
> >
> > >  I looked at the logs and the ones that are text had nothing about it.
> >
> > Digital camera or pencil and paper will be least complex way to capture
> > the ooops data.  Please don't leave out the "Code" bytes at the bottom
> > and do your best to make sure those are absolutely correct.
> >
> > Regards,
> > Andy
> >
> >
> > > ----- Original Message ----- 
> > > From: "Steven Toth" <stoth@linuxtv.org>
> > > To: <linux-media@vger.kernel.org>
> > > Cc: <linux-dvb@linuxtv.org>
> > > Sent: Monday, March 16, 2009 6:59 AM
> > > Subject: Re: [linux-dvb] FusionHDTV7 and v4l causes kernel panic
> > >
> > >
> > > > Timothy D. Lenz wrote:
> > > > > Using kernel 2.6.26.8 and v4l from a few days ago. When I modprobe cx23885 to load the drivers, I get kernel panic
> > > >
> > > > We'll need the oops.
> > > >
> > > > - Steve
> > > >
> > > > _______________________________________________
> > > > linux-dvb users mailing list
> > > > For V4L/DVB development, please use instead linux-media@vger.kernel.org
> > > > linux-dvb@linuxtv.org
> > > > http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
> > >
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> > >
> >
> 
> 
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