Re: Badness in kobject_get at lib/kobject.c:439

From: "Svetoslav Slavtchev" <svetljo@gmx.de>
To: Greg KH <greg@kroah.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Badness in kobject_get at lib/kobject.c:439
Date: Wed, 10 Dec 2003 01:36:25 +0100 (MET)	[thread overview]
Message-ID: <31894.1071016585@www6.gmx.net> (raw)

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> On Wed, Dec 10, 2003 at 12:02:56AM +0100, Svetoslav Slavtchev wrote:
> > Call Trace:
> >  [<c019a1f4>] kobject_get+0x30/0x3d
> >  [<c01dd8d3>] class_get+0x1a/0x2c
> >  [<c01ddb67>] class_device_add+0x41/0x110
> >  [<c01cc4ec>] misc_add_class_device+0x63/0xc6
> >  [<c01cc6d8>] misc_register+0xeb/0x120
> >  [<c0361fd8>] apm_init+0x2ec/0x324
> 
> Hm, here's the problem.  Can you disable APM and see if the oops goes
> away?  I bet apm_init() is being called before misc_init() is.
> 
> If you don't want to disable APM (and you should not have to) can you
> apply the patch below to misc.c and let me know if it fixes your problem
> or not?
> 
> thanks,
> 
> greg k-h
> 
> --- a/drivers/char/misc.c	Mon Oct  6 10:47:30 2003
> +++ b/drivers/char/misc.c	Tue Dec  9 15:28:10 2003
> @@ -407,4 +407,4 @@
>  	}
>  	return 0;
>  }
> -module_init(misc_init);
> +subsys_initcall(misc_init);
> 

that brought me probably to the real problem

which seems to come from ruby ( http://linuxconsole.sf.net )

the attached oops couldn't happen in vanilla kernel ?
or should i try without the ruby patches ?

best,

svetljo

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ksymoops 2.4.9 on i686 2.6.0-ruby_t11_5vcs.  Options used
     -v rpm/BUILD/kernel-ruby/tmp/vmlinux (specified)
     -K (specified)
     -l /proc/modules (default)
     -o /lib/modules/2.6.0-t11r5misc/ (specified)
     -m /boot/System.map-2.6.0-t11r5misc (specified)

No modules in ksyms, skipping objects
No ksyms, skipping lsmod
Unable to handle kernel NULL pointer dereference at virtual address 00000000
c036c315
*pde = 00000000
Oops: 0000 [#1]
CPU:    0
EIP:    0060:[<c036c315>]    Not tainted VLI
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010282
eax: 00000000   ebx: c03c24c4   ecx: 00000001   edx: c03c3b10
esi: 00000162   edi: f7fd868c   ebp: c1a37f94   esp: c1a37f8c
ds: 007b   es: 007b   ss: 0068
Stack: c03925cc c03129e4 c1a37fa4 c036c4b8 c02b2052 c03b8c4c c1a37fcc c036bdfe
       c02b2052 00400000 00000000 00400000 00002180 c02aba11 00000001 00000000
       c1a37fdc c035a6ce c1a36000 00000000 c1a37fec c01050b4 c0105082 00000000
Call Trace:
 [<c036c4b8>] vty_init+0xde/0xf1
 [<c036bdfe>] tty_init+0x21c/0x225
 [<c035a6ce>] do_initcalls+0x35/0x87
 [<c01050b4>] init+0x32/0x10e
 [<c0105082>] init+0x0/0x10e
 [<c0109201>] kernel_thread_helper+0x5/0xb
Code: ff c9 31 c0 c3 55 89 e5 56 31 f6 53 8b 1d 24 41 31 c0 3b b3 c0 10 00 00 73

>>EIP; c036c315 <console_map_init+26/42>   <=====

>>ebx; c03c24c4 <vga_vt+1104/1120>
>>edx; c03c3b10 <queue_handler_lock+6b0/800>
>>edi; f7fd868c <__crc_clip_tbl_hook+816a2/11069a>
>>ebp; c1a37f94 <__crc_unregister_chrdev+10ab03/2aa8c7>
>>esp; c1a37f8c <__crc_unregister_chrdev+10aafb/2aa8c7>

Trace; c036c4b8 <vty_init+de/f1>
Trace; c036bdfe <tty_init+21c/225>
Trace; c035a6ce <do_initcalls+35/87>
Trace; c01050b4 <init+32/10e>
Trace; c0105082 <init+0/10e>
Trace; c0109201 <kernel_thread_helper+5/b>

Code;  c036c315 <console_map_init+26/42>
00000000 <_EIP>:
Code;  c036c315 <console_map_init+26/42>   <=====
   0:   ff c9                     dec    %ecx   <=====
Code;  c036c317 <console_map_init+28/42>
   2:   31 c0                     xor    %eax,%eax
Code;  c036c319 <console_map_init+2a/42>
   4:   c3                        ret    
Code;  c036c31a <console_map_init+2b/42>
   5:   55                        push   %ebp
Code;  c036c31b <console_map_init+2c/42>
   6:   89 e5                     mov    %esp,%ebp
Code;  c036c31d <console_map_init+2e/42>
   8:   56                        push   %esi
Code;  c036c31e <console_map_init+2f/42>
   9:   31 f6                     xor    %esi,%esi
Code;  c036c320 <console_map_init+31/42>
   b:   53                        push   %ebx
Code;  c036c321 <console_map_init+32/42>
   c:   8b 1d 24 41 31 c0         mov    0xc0314124,%ebx
Code;  c036c327 <console_map_init+38/42>
  12:   3b b3 c0 10 00 00         cmp    0x10c0(%ebx),%esi
Code;  c036c32d <console_map_init+3e/42>
  18:   73 00                     jae    1a <_EIP+0x1a>

 <0>Kernel panic: Attempted to kill init!