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From: Grant Coady <gcoady.lk@gmail.com>
To: Willy Tarreau <willy@w.ods.org>
Cc: linux-kernel@vger.kernel.org, Marcelo Tosatti <marcelo@kvack.org>,
       Grant Coady <grant_lkml@dodo.com.au>,
       Jari Ruusu <jariruusu@users.sourceforge.net>,
       Chris Wright <chrisw@sous-sol.org>
Subject: Re: [ANNOUNCE] Linux-2.4.32-hf32.5
Date: Fri, 26 May 2006 23:28:51 +1000
Organization: http://bugsplatter.mine.nu/
Message-ID: <vvvd72p7mv2j9fet19evm807e0flonnugh@4ax.com>
References: <20060507131034.GA19198@exosec.fr> <20060525133427.GA22727@w.ods.org> <k2nd725cl0vocvb72boalj06tpjlita644@4ax.com> <20060526121623.GA14474@w.ods.org>
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On Fri, 26 May 2006 14:16:23 +0200, Willy Tarreau <willy@w.ods.org> wrote:

>Could you please pass it through ksymoops so that we get an idea about the
>function causing this ? What was the last version not causing it ? hf32.4 ?

Yes, hf32.4 okay, see: <http://bugsplatter.mine.nu/test/linux-2.4/>

>This looks like a structure member gets accessed while a pointer is NULL,
>if you always get 0x88... I would be it could come from
>2.4.32-ext3-link-unlink-race-1, but that would be strange.

Good guess!  The previous version comment stripped .configs are 
linked by machine name from the summary page above.


Localtime 23:28 so it will be overnight delay before I reply to 
queries for further info ;) 

grant@sempro:~$ ksymoops -v ~/linux/linux-2.4.32-hf32.5/vmlinux -m /boot/System.map-2.4.32-hf32.5 oops
ksymoops 2.4.11 on i686 2.6.16.17a.  Options used
     -v /home/grant/linux/linux-2.4.32-hf32.5/vmlinux (specified)
     -k /proc/ksyms (default)
     -l /proc/modules (default)
     -o /lib/modules/2.6.16.17a/ (default)
     -m /boot/System.map-2.4.32-hf32.5 (specified)

Error (regular_file): read_ksyms stat /proc/ksyms failed
ksymoops: No such file or directory
No modules in ksyms, skipping objects
No ksyms, skipping lsmod
Unable to handle kernel NULL pointer dereference at virtual address 00000088 printing eip:
c013ee43
*pde = 00000000
Oops: 0002
CPU:    0
EIP:    0010:[<c013ee43>]    Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246
eax: 00000088   ebx: c19bb5c0   ecx: 00000088   edx: f7bf0005
esi: f7e3c508   edi: c19bb5c0   ebp: f7e3c480   esp: f7e6bf18
ds: 0018   es: 0018   ss: 0018
Process swapper (pid: 1, stackpage=f7e6b000)
Stack: c19bb5c0 00000000 c19bb5c0 f7bf0000 f7e6bf3c c19bb5c0 c013f056 f7e3c480
       c19bb5c0 c19bb440 c19ac140 f7bf0005 00000004 01c0d8cc 00000010 00000000
       c013e727 00000803 c02a18f6 c0105000 0008e000 c0302bfb c02a18f6 f7bf0000
Call Trace:    [<c013f056>] [<c013e727>] [<c0105000>] [<c013e890>] [<c01051f3>]
  [<c0105085>] [<c010568b>] [<c0105070>]
Code: ff 08 0f 88 8f 16 00 00 8b 5f 08 85 db 74 0c 8b 47 0c 39 68


>>EIP; c013ee43 <vfs_unlink+33/190>   <=====

Trace; c013f056 <sys_unlink+b6/120>
Trace; c013e727 <vfs_mknod+c7/120>
Trace; c0105000 <_stext+0/0>
Trace; c013e890 <sys_mknod+110/180>
Trace; c01051f3 <prepare_namespace+73/140>
Trace; c0105085 <init+15/110>
Trace; c010568b <arch_kernel_thread+2b/40>
Trace; c0105070 <init+0/110>

Code;  c013ee43 <vfs_unlink+33/190>
00000000 <_EIP>:
Code;  c013ee43 <vfs_unlink+33/190>   <=====
   0:   ff 08                     decl   (%eax)   <=====
Code;  c013ee45 <vfs_unlink+35/190>
   2:   0f 88 8f 16 00 00         js     1697 <_EIP+0x1697>
Code;  c013ee4b <vfs_unlink+3b/190>
   8:   8b 5f 08                  mov    0x8(%edi),%ebx
Code;  c013ee4e <vfs_unlink+3e/190>
   b:   85 db                     test   %ebx,%ebx
Code;  c013ee50 <vfs_unlink+40/190>
   d:   74 0c                     je     1b <_EIP+0x1b>
Code;  c013ee52 <vfs_unlink+42/190>
   f:   8b 47 0c                  mov    0xc(%edi),%eax
Code;  c013ee55 <vfs_unlink+45/190>
  12:   39 68 00                  cmp    %ebp,0x0(%eax)

 <0>Kernel panic: Attempted to kill init!

1 error issued.  Results may not be reliable.

Thanks,
Grant.
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