[linux-dvb] Re: dvb-bt8xx and net device

[André Stein <stone@steinsoft.net>]

Hi,

> /proc/ksyms contains the symbols of all loaded modules
	I checked again.. yes it contains symbols of all loaded modules but 
after a reboot the call addresses from the last trace don't match those 
found in ksyms. They have to be converted in some way using the data 
from the oops trace..

> hmmm. Does this only occur with the bt8xx cards or also with the old 
> Nova cards?
I don't know. I just have a bt8xx card. You have a nova card so you 
should try the code out but if tcpdump works that doesn't necessarily 
mean everything is fine.. As I said in my last mail I can use tcpdump 
alone too, but as soon as I start the ipviasky proxy, the kernel's life 
will be short ;) Your new additions unfortunately didn't help. Still 
same crash..

> I suppose this oops occurs because the software demux is called with 
> invalid buffer pointers or buffer length arguments. Thus the memcpy 
> function crashes when it's trying to read after the end of the buffer. 
> Or there is a serious undiscovered bug in the software demultiplexer.
>
> I added some more restricted locking and an additional sanity check in 
> the synchronizer code, could you please add some printk()'s in the 
> dvb_dmx_swfilter(), dvb_dmx_swfilter_section_packet() and 
> dvb_dmx_memcopy() functions in order to find out what exactly is going 
> wrong?
>
> Please print the actual line number (remember that you must not insert 
> new lines in order to maintain the original line numbers), the requested 
> number of copied bytes, the copy start offset and whether the bytes are 
> copied from demux->tsbuf in dvb_dmx_swfilter() or from 
> card->bt->buf_cpu[] through the tasklet processing function 
> (dvb_bt8xx_task() in dvb-bt8xx.c)?
I will try that out soon..

First I have some questions/remarks.. As I already said, the problems 
seem to appear when more than only one multi_secfilter is selected. When 
starting tcpdump, I have a message like dvb_net_feed_start: set 
multi_secfilter[0]. Like this I don't get any problem. But when I 
additionally start the proxy, I get output like this:

dvb0_0: set_mc_list, 1 entries
dvb_net_feed_start: rx_mode 1
dvb_net_feed_start: alloc secfeed
dvb_net_feed_start: set secfilter
dvb0_0: filter mac=30 8d 00 03 30 00
dvb0_0: filter mask=ff ff ff ff ff ff
dvb_net_feed_start: set multi_secfilter[0]
dvb0_0: filter mac=30 8d 00 03 30 00
dvb0_0: filter mask=ff ff ff ff ff ff
dvb_net_feed_start: start filtering
dvb_net_feed_stop
dvb_net_feed_stop: stop secfeed
dvb_net_feed_stop: release secfilter
dvb_net_feed_stop: release multi_filter[0]
dvb0_0: set_mc_list, 2 entries
dvb_net_feed_start: rx_mode 1
dvb_net_feed_start: alloc secfeed
dvb_net_feed_start: set secfilter
dvb0_0: filter mac=30 8d 00 03 30 00
dvb0_0: filter mask=ff ff ff ff ff ff
dvb_net_feed_start: set multi_secfilter[0]
dvb0_0: filter mac=30 8d 00 03 30 00
dvb0_0: filter mask=ff ff ff ff ff ff
dvb_net_feed_start: set multi_secfilter[1]
dvb0_0: filter mac=30 8d 00 03 30 00
dvb0_0: filter mask=ff ff ff ff ff ff
dvb_net_feed_start: start filtering
dvb_net_feed_stop
dvb_net_feed_stop: stop secfeed
dvb_net_feed_stop: release secfilter
dvb_net_feed_stop: release multi_filter[0]
dvb_net_feed_stop: release multi_filter[1]
dvb0_0: set_mc_list, 1 entries
dvb_net_feed_start: rx_mode 1
dvb_net_feed_start: alloc secfeed
dvb_net_feed_start: set secfilter
dvb0_0: filter mac=30 8d 00 03 30 00
dvb0_0: filter mask=ff ff ff ff ff ff
dvb_net_feed_start: set multi_secfilter[0]
dvb0_0: filter mac=30 8d 00 03 30 00
dvb0_0: filter mask=ff ff ff ff ff ff
dvb_net_feed_start: start filtering

There are several multi_filter's setup and I am very sure that the 
problem must be here, either directly in the network code or in the 
underlying bt8xx code. To get an idea where the problems actually lies, 
it would be best to have someone with a _normal_ card like a siemens 
that are usually proven to work fine with dvb-kernel. After my opinion 
the multicasting code starts in some way the fatal crash. But that's 
only my opinion..

Thanks again,
-André.
--
http://www.steinsoft.net
	cout << "Happy Coding!" << endl;



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