Re: [d-kernel] ?????? oops

[Sergey Vlasov <vsu@altlinux.ru>]

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On Mon, Mar 29, 2004 at 04:09:35PM +0300, Andrey Khavryuchenko wrote:
> Background: опакечиваю user-space поддержку Zyxel Prestige 630 EE (630-11)
> Запускаемая ручками инициализация/прибитие работает без проблем.  При
> попытке запустить то же из hotplug поймал oops:

static int br2684_regvcc(struct atm_vcc *atmvcc, unsigned long arg)
...
	skb_queue_head_init(&copy);
	skb_migrate(&atmvcc->sk->receive_queue, &copy);
	while ((skb = skb_dequeue(&copy))) {
		BRPRIV(skb->dev)->stats.rx_bytes -= skb->len;
		BRPRIV(skb->dev)->stats.rx_packets--;
		br2684_push(atmvcc, skb);
	}
...

и вот в этом цикле поймали skb->dev == NULL.  Интересно, откуда
могли взяться такие пакеты?  Никогда не имел дела с ATM...

> akhavr@netmaster /tmp/amedyn/scripts $ sudo /usr/sbin/ksymoops < /var/log/messages
> ksymoops 2.4.9 on i686 2.4.25-std-up-alt1.  Options used
>      -V (default)
>      -k /proc/ksyms (default)
>      -l /proc/modules (default)
>      -o /lib/modules/2.4.25-std-up-alt1/ (default)
>      -m /boot/System.map-2.4.25-std-up-alt1 (default)
> 
> Warning: You did not tell me where to find symbol information.  I will
> assume that the log matches the kernel and modules that are running
> right now and I'll use the default options above for symbol resolution.
> If the current kernel and/or modules do not match the log, you can get
> more accurate output by telling me the kernel version and where to find
> map, modules, ksyms etc.  ksymoops -h explains the options.
> 
> Warning (compare_ksyms_lsmod): module ext3 is in lsmod but not in ksyms, probably no symbols exported
> Mar 29 15:30:37 netmaster kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000178
> Mar 29 15:30:37 netmaster kernel: dff43862
> Mar 29 15:30:37 netmaster kernel: *pde = 07992067
> Mar 29 15:30:37 netmaster kernel: Oops: 0000
> Mar 29 15:30:37 netmaster kernel: CPU:    0
> Mar 29 15:30:38 netmaster kernel: EIP:    0010:[<dff43862>]    Tainted: P 
> Using defaults from ksymoops -t elf32-i386 -a i386
> Mar 29 15:30:38 netmaster kernel: EFLAGS: 00010286
> Mar 29 15:30:38 netmaster kernel: eax: 00000000   ebx: cb261f40   ecx: c8025f00   edx: 00000282
> Mar 29 15:30:38 netmaster kernel: esi: d72c9106   edi: 00000054   ebp: 0000000e   esp: cb261efc
> Mar 29 15:30:38 netmaster kernel: ds: 0018   es: 0018   ss: 0018
> Mar 29 15:30:38 netmaster kernel: Process br2684ctl (pid: 31994, stackpage=cb261000)
> Mar 29 15:30:38 netmaster kernel: Stack: c3da1e00 08040002 00000002 3073616e 00000000 00000000 00000000 00000000 
> Mar 29 15:30:38 netmaster kernel:        00000000 00000000 00000001 00000000 00000000 00000000 00000000 00000000 
> Mar 29 15:30:38 netmaster kernel:        00000108 dcf89ca0 c80259c0 0000000e dff43b44 dff234d4 400261f2 bffff530 
> Mar 29 15:30:38 netmaster kernel: Call Trace:    [<dff43b44>] [<dff234d4>] [<dff1ec6a>] [sock_ioctl+30/48] [sys_ioctl+583/608]
> Mar 29 15:30:38 netmaster kernel: Call Trace:    [<dff43b44>] [<dff234d4>] [<dff1ec6a>] [<c01e106e>] [<c0146a07>]
> Mar 29 15:30:38 netmaster kernel:   [<c0108823>]
> Mar 29 15:30:38 netmaster kernel: Code: 8b 90 78 01 00 00 29 fa 89 90 78 01 00 00 8b 41 18 8b b0 70 
> 
> 
> >>EIP; dff43862 <[br2684]br2684_regvcc+282/2d0>   <=====
> 
> >>ebx; cb261f40 <_end+af4a5b0/1f81a6d0>
> >>ecx; c8025f00 <_end+7d0e570/1f81a6d0>
> >>esi; d72c9106 <_end+16fb1776/1f81a6d0>
> >>esp; cb261efc <_end+af4a56c/1f81a6d0>
> 
> Trace; dff43b44 <[br2684]br2684_ioctl+44/d0>
> Trace; dff234d4 <[atm]br2684_ioctl_mutex+0/10>
> Trace; dff1ec6a <[atm]vcc_ioctl+9ea/a20>
> Trace; dff43b44 <[br2684]br2684_ioctl+44/d0>
> Trace; dff234d4 <[atm]br2684_ioctl_mutex+0/10>
> Trace; dff1ec6a <[atm]vcc_ioctl+9ea/a20>
> Trace; c01e106e <sock_ioctl+1e/30>
> Trace; c0146a07 <sys_ioctl+247/260>
> Trace; c0108823 <system_call+33/40>
> 
> Code;  dff43862 <[br2684]br2684_regvcc+282/2d0>
> 00000000 <_EIP>:
> Code;  dff43862 <[br2684]br2684_regvcc+282/2d0>   <=====
>    0:   8b 90 78 01 00 00         mov    0x178(%eax),%edx   <=====
> Code;  dff43868 <[br2684]br2684_regvcc+288/2d0>
>    6:   29 fa                     sub    %edi,%edx
> Code;  dff4386a <[br2684]br2684_regvcc+28a/2d0>
>    8:   89 90 78 01 00 00         mov    %edx,0x178(%eax)
> Code;  dff43870 <[br2684]br2684_regvcc+290/2d0>
>    e:   8b 41 18                  mov    0x18(%ecx),%eax
> Code;  dff43873 <[br2684]br2684_regvcc+293/2d0>
>   11:   8b b0 70 00 00 00         mov    0x70(%eax),%esi
> 
> 
> 2 warnings issued.  Results may not be reliable.

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