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

[Holger Waechtler <holger@convergence.de>]

Hi André,

net->addr_len was not initialized. Could you please try again and report 
if this helps? If not please add some debug messages using printk() in 
the network code below register_netdev() in order to see which variables 
are actually not correctly initialized.

thanks,

Holger


André Stein wrote:
> Hi,
>
> > 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.
>
>     Okay I followed your advice and I tried to get as much information 
> about the oops as possible. It's a little bit weird because it doesn't 
> happen always while running the same command. I could reproduce it now 
> twice when calling dvbtune to bring the net device up:
>
> # dvbtune -c 0 -f 10773250 -p H -s 22000 -n 251
> Using DVB card "Conexant CX24110 with CX24108 tuner, aka HM1221/HM1811"
> tuning DVB-S to L-Band:-1073742764, Pol:H Srate=22000000, 22kHz=off
> polling....
> Getting frontend event
> FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI 
> FE_HAS_SYNC
> Bit error rate: 2
> Signal strength: 36751
> SNR: 355
> FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI 
> FE_HAS_SYNC
> Segmentation fault
>
> The system gets instable after that and can't be shutdown normally. 
> dmesg | ksymoops gives you:
>
> cpu: 0, clocks: 1993384, slice: 996692
> Unable to handle kernel paging request at virtual address ffeef438
> c021ddac
> *pde = 00003063
> Oops: 0000
> CPU:    0
> EIP:    0010:[<c021ddac>]    Tainted: P
> Using defaults from ksymoops -t elf32-i386 -a i386
> EFLAGS: 00010212
> eax: 0000000a   ebx: 00000004   ecx: 00000001   edx: 00000008
> esi: ffeef438   edi: c005a05c   ebp: 00000008   esp: c5db7dd4
> ds: 0018   es: 0018   ss: 0018
> Process dvbtune (pid: 1025, stackpage=c5db7000)
> Stack: c6f575e0 00000000 c02f1c2d c92c0288 c021e235 c6f575e0 0000000a 
> 00000004
>        ffeef438 c6f575e0 c92c0288 00000005 00000000 c02f1c28 00000202 
> c02f1c60
>        00000f14 c005a000 c005a000 00001000 c021e41a c6f575e0 c92c0288 
> 00000010
> Call Trace:    [<c021e235>] [<c021e41a>] [<c021e892>] [<c0121e5a>] 
> [<c0219ccd>]
>   [<c01b7bca>] [<cc85a1e2>] [<cc8575be>] [<cc8576ca>] [<cc85319b>] 
> [<c0140e08>]
>   [<c01370c6>] [<cc85966c>] [<c0137398>] [<c0135ff9>] [<c0135f0e>] 
> [<cc857747>]
>   [<cc85767c>] [<c0144967>] [<c0106f17>]
> Code: f3 a5 f6 c3 02 74 02 66 a5 f6 c3 01 74 01 a4 5b 5e 5f 5d c3
>
>
>  >>EIP; c021ddac <__rta_fill+70/84>   <=====
>
>  >>esp; c5db7dd4 <_end+5a46550/c4dc7dc>
>
> Trace; c021e235 <rtnetlink_fill_ifinfo+31d/3b8>
> Trace; c021e41a <rtmsg_ifinfo+32/7c>
> Trace; c021e892 <rtnetlink_event+32/38>
> Trace; c0121e5a <notifier_call_chain+1e/38>
> Trace; c0219ccd <register_netdevice+151/168>
> Trace; c01b7bca <register_netdev+5e/70>
> Trace; cc85a1e2 <[dvb-core]__kstrtab_dvb_ringbuffer_avail+d/1d>
> Trace; cc8575be <[dvb-core]dvb_net_add_if+126/138>
> Trace; cc8576ca <[dvb-core]dvb_net_do_ioctl+4e/ac>
> Trace; cc85319b <[dvb-core]dvb_usercopy+b3/129>
> Trace; c0140e08 <link_path_walk+888/99c>
> Trace; c01370c6 <get_chrfops+5a/15c>
> Trace; cc85966c <[dvb-core]dvb_device_open+68/dc>
> Trace; c0137398 <chrdev_open+64/98>
> Trace; c0135ff9 <dentry_open+e1/188>
> Trace; c0135f0e <filp_open+52/5c>
> Trace; cc857747 <[dvb-core]dvb_net_ioctl+1f/24>
> Trace; cc85767c <[dvb-core]dvb_net_do_ioctl+0/ac>
> Trace; c0144967 <sys_ioctl+1bb/1f6>
> Trace; c0106f17 <system_call+33/38>
>
> Code;  c021ddac <__rta_fill+70/84>
> 00000000 <_EIP>:
> Code;  c021ddac <__rta_fill+70/84>   <=====
>    0:   f3 a5                     repz movsl %ds:(%esi),%es:(%edi)   <=====
> Code;  c021ddae <__rta_fill+72/84>
>    2:   f6 c3 02                  test   $0x2,%bl
> Code;  c021ddb1 <__rta_fill+75/84>
>    5:   74 02                     je     9 <_EIP+0x9>
> Code;  c021ddb3 <__rta_fill+77/84>
>    7:   66 a5                     movsw  %ds:(%esi),%es:(%edi)
> Code;  c021ddb5 <__rta_fill+79/84>
>    9:   f6 c3 01                  test   $0x1,%bl
> Code;  c021ddb8 <__rta_fill+7c/84>
>    c:   74 01                     je     f <_EIP+0xf>
> Code;  c021ddba <__rta_fill+7e/84>
>    e:   a4                        movsb  %ds:(%esi),%es:(%edi)
> Code;  c021ddbb <__rta_fill+7f/84>
>    f:   5b                        pop    %ebx
> Code;  c021ddbc <__rta_fill+80/84>
>   10:   5e                        pop    %esi
> Code;  c021ddbd <__rta_fill+81/84>
>   11:   5f                        pop    %edi
> Code;  c021ddbe <__rta_fill+82/84>
>   12:   5d                        pop    %ebp
> Code;  c021ddbf <__rta_fill+83/84>
>   13:   c3                        ret
>
> Hope that helps you this time. It's somehow related with adding the net 
> device but I don't whether it's the card driver or the network code.
>
> Thanks again,
> -André.


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