I had a missconfiguration with nm on my system (I am very sorry):
Now I have a somewhat better ksymoops of the problem (Linux Kernel 2.4.21)
ksymoops 2.4.9 on i586 2.4.21. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.21/ (default)
-m /root/linux-2.4.21/System.map (specified)
Jun 25 16:59:30 linux kernel: Unable to handle kernel NULL pointer
dereference at virtual address 00000048
Jun 25 16:59:30 linux kernel: c4b79377
Jun 25 16:59:30 linux kernel: *pde = 00000000
Jun 25 16:59:30 linux kernel: Oops: 0000
Jun 25 16:59:30 linux kernel: CPU: 0
Jun 25 16:59:30 linux kernel: EIP: 0010:[<c4b79377>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
Jun 25 16:59:30 linux kernel: EFLAGS: 00010246
Jun 25 16:59:30 linux kernel: eax: 00000000 ebx: bcbff6e8 ecx: c2111a28
edx: c4b79360
Jun 25 16:59:30 linux kernel: esi: 40047612 edi: 40047612 ebp: c12edf94
esp: c12edf7c
Jun 25 16:59:30 linux kernel: ds: 0018 es: 0018 ss: 0018
Jun 25 16:59:30 linux kernel: Process java (pid: 413, stackpage=c12ed000)
Jun 25 16:59:30 linux kernel: Stack: 00000000 40047612 bcbff6e8 c2112204
c2112204 bcbff6e8 c12edfbc c01400c9
Jun 25 16:59:30 linux kernel: c2244d6c c2112204 40047612 bcbff6e8
c12ec000 bcbff6e8 0807ce38 ffffffe7
Jun 25 16:59:30 linux kernel: bcbff6f4 c0108bb3 00000005 40047612
bcbff6e8 bcbff6e8 0807ce38 bcbff6f4
Jun 25 16:59:30 linux kernel: Call Trace: [<c01400c9>] [<c0108bb3>]
Jun 25 16:59:30 linux kernel: Code: 8b 40 48 ff d0 3d fd fd ff ff 75 05 b8
ea ff ff ff 8d 65 f8
Error (pclose_local): Oops_decode_part pclose failed 0xb
Error (Oops_decode_part): no objdump lines read for /tmp/ksymoops.vatq9a
>>EIP; c4b79377 <[videodev]video_ioctl+17/40> <=====
>>ecx; c2111a28 <_end+1d76eac/47a2484>
>>edx; c4b79360 <[videodev]video_ioctl+0/40>
>>ebp; c12edf94 <_end+f53418/47a2484>
>>esp; c12edf7c <_end+f53400/47a2484>
Trace; c01400c9 <sys_ioctl+179/1a0>
Trace; c0108bb3 <system_call+33/40>
2 errors issued. Results may not be reliable.
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: "Detlef Schmicker (Siebertz Electronic GmbH)"
<[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Tuesday, June 24, 2003 2:08 PM
Subject: Re: [linux-usb-devel] kernel NULL pointer at unpluging pwc webcam
> > Does anybody know this problem, what additional information do you need,
how
> > can I debug.
>
> Please run the oops through ksymoops and tell us the kernel version.
>
> Regards
> Oliver
>
>
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