[linux-dvb] general protection fault: 0000 [1] SMP with 2.6.27 and 2.6.28

Chris Mayo mayo at clara.co.uk
Mon Feb 2 20:18:01 CET 2009


Andy Walls wrote:
> On Sun, 2009-02-01 at 23:38 +0100, Oliver Endriss wrote:
>> Andy Walls wrote:
>>> On Sat, 2009-01-31 at 15:01 +0000, Chris Mayo wrote:
> 
>>> So tuner_addr is non-NULL and is not a valid pointer either.
>>>
>>> It looks like linux/drivers/media/dvb/ttpci/budget.c:frontend_init() is
>>> setting the pointer up properly.  So something else is trashing the
>>> struct dvb_frontend structure pointed to by the variable fe.  Finding
>>> what's doing that will be difficult.
>>>
>>> Without a device nor steps to reliably reproduce, that's about all I can
>>> help with.
>>>
>>> Regards,
>>> Andy
>> Afaik this bug was fixed in changeset
>> http://linuxtv.org/hg/v4l-dvb/rev/f4d7d0b84940
>>
>> CU
>> Oliver
> 
> Thanks.  I didn't realize the initialization to NULL was a recent fix.
> I was looking at very recent v4l-dvb source code with that change in
> place (which is why I thought tracking down the problem would be hard).
> 
> I agree that that change likely fixes the problem, if Chris doesn't have
> it in place.
> 
> Regards,
> Andy
> 

I didn't have the patch (and hadn't seen it so seems a good advert for
merging the lists). Have applied it to 2.6.28 and OK so far. Thanks for
pointing it out and the investigation.

Chris



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