[linux-dvb] Re: segfault loading dvb-bt8xx with nebula digiTv

[Michael Hunold <hunold@convergence.de>]

Hello Rob,

> What can I do to trace where the error is coming from?  Its easy to see
> from the output that there is a null pointer in there somewhere:
> But where to from here?
Run your oops through "ksymoops". It will resolve the numbers in the 
oops to a human readable format, so you and we can have a look where the 
oops is actually taking place in the code.

> Unable to handle kernel NULL pointer dereference at virtual address 00000000
>  printing eip:
> de9c8a15
> *pde = 00000000
> Oops: 0000
> CPU:    0
> EIP:    0010:[<de9c8a15>]    Not tainted
> EFLAGS: 00010a96
> eax: 00000000   ebx: 00000001   ecx: 00000000   edx: c0000000
> esi: 00000000   edi: 00000001   ebp: db605e2c   esp: db605dac
> ds: 0018   es: 0018   ss: 0018
> Process modprobe (pid: 3576, stackpage=db605000)
> Stack: 00000001 de9fd000 de9a7e8d 00000001 00000000 00000001 de9d4a20 de9c8d60
>        de9d4a20 db605e2c 00000001 de9d4a64 de9d4a24 00000001 de9fd000 de9a7e8d
>        de9d4a24 db605e2c 00000001 db4c4000 00000014 db605f04 de9fd1fe de9d4a24
> Call Trace:    [<de9a7e8d>] [<de9d4a20>] [<de9c8d60>] [<de9d4a20>] [<de9d4a64>]
>   [<de9d4a24>] [<de9a7e8d>] [<de9d4a24>] [<de9fd1fe>] [<de9d4a24>] [<de9f42bb>]
>   [<de9f51d0>] [<de9e6610>] [<de9e67ec>] [<de9ed880>] [<de9e68c2>] [<de9fd534>]
>   [<de9fd1b0>] [<de9fe518>] [<de9fd7e8>] [<de9fd9ef>] [<c011bd4b>] [<de9fd060>]
>   [<de9fe07c>] [<de9fd060>] [<de9fd060>] [<c0109103>]
>
> Code: 0f b6 00 c1 e0 10 09 c2 89 d6 81 ce 8b 00 00 00 66 83 7d 04
> Any help much appreciated.

You must be extremely carful that you compile all modules and drivers 
against the same header files, ie. make sure that no old header files 
are lying around for example in /usr/include/linux that may be used by 
accident.

> Thanks,
> Rob Wills

CU
Michael.



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