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

[Holger Waechtler <holger@convergence.de>]

André Stein wrote:
> Hi,
>
> > thanks for the hint - in this driver the dvb_net device was not 
> > registered. I added this, can you please update your CVS source and 
> > recompile the driver?
> >
> > I was not able to test this since I don't have access to any bt8xx 
> > based card, so please report whether it's working for you or if you 
> > run in troubles...
>
>     Okay I've got the latest version from CVS and so I compiled it and 
> installed the new drivers. To make sure that I have a clean system, I 
> rebooted and modprobed the new drivers. After using dvbtune to set the 
> T-DSL sat frequence and to open the network device, everything seemed 
> alright to me. dvbtune said that the network device has been opened 
> successfuly and that it should be configured now - this didn't happen 
> before.
>
> But when I tried to set the IP address of the new dvb0_0 interface, I 
> got a segmentation fault.
> # ifconfig dvb0_0 192.169.0.99
that's probably the oops point -- please run xconsole or something like 
this or enable kernel debug messages by tapping 'dmesg -n 8'.


> I couldn't rmmod the bt8xx module anymore and every time I tried to run 
> ifconfig -a dvb0_0 the console hung and the process couldn't be killed 
> by either Ctrl + C or kill <pid>. After rebooting the system manually, I
> tried
> # ifconfig dvb0_0 hw ether 00:01:02:03:04:05
> which worked fine. But always when I try to set the IP address I get a 
> fatal segmentation fault.
Please post only the output of the first oops - all the later ones might 
be meaningless.

> Here is the last dmesg output I got after configuring the net device:
>
> bttv0: IRQ lockup, cleared int mask
> //*****
> Unable to handle kernel paging request at virtual address ffeeeef4
>  printing eip:
> ffeeeef4
> *pde = 00003063
> *pte = 00000000
> Oops: 0000
> CPU:    0
> EIP:    0010:[<ffeeeef4>]    Tainted: P
> EFLAGS: 00010282
> eax: ffeeeef4   ebx: c02f32c0   ecx: caa13120   edx: 00000b00
> esi: c02f3334   edi: caa1316c   ebp: c546c288   esp: c2e87ea8
> ds: 0018   es: 0018   ss: 0018
> Process ifconfig (pid: 649, stackpage=c2e87000)
> Stack: c021cc14 c546c288 caa13120 c2202780 c02f36fc c22027bc c546c288 
> caa13120
>        c02478d0 c546c288 c02f32c0 00000000 c7074ee0 c546c288 bffffb58 
> c2202760
>        c0247f22 c546c288 0101000a 00000001 c2e87f6c c02487e6 c546c288 
> c7074ee0
> Call Trace:    [<c021cc14>] [<c02478d0>] [<c0247f22>] [<c02487e6>] 
> [<c024ab47>]
>   [<c02122cf>] [<c0144967>] [<c0106f17>]
>
> Code:  Bad EIP value.
>
>
> I don't know whether this helps you..
you have to use ksymoops to resolve the symbols. Please post the output of

$ dmesg | ksymoops

Read the ksymoops manpage for details and ensure that System.map and the 
used kernel image match the running kernel.

thanks,

Holger



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