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Date: Sat, 10 Dec 2005 22:34:53 -0800
From: Andrew Morton <akpm@osdl.org>
To: Ashutosh Naik <ashutosh.naik@gmail.com>
Cc: linux-kernel@vger.kernel.org, greg@kroah.com
Subject: Re: [BUG] Early Kernel Panic with 2.6.15-rc5
Message-Id: <20051210223453.24f7515b.akpm@osdl.org>
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Ashutosh Naik <ashutosh.naik@gmail.com> wrote:
>
> Distribution:
> Fedora Core 2, 2.6.15-rc5 kernel
> 
> Hardware Environment:
> Acer Travelmate 240 ,Intel Celeron 2.6 Ghz, lspci with 2.6.14 attached
> 
> Description
> I am getting an early kernel panic when I compiled the Kernel
> 2.6.15-rc5 on my Acer Laptop. The dump is as follows. It is
> reproducible every time on bootup.
> 
> Uncompressing Linux... Ok, booting the kernel.
> Unable to handle kernel NULL pointer dereference at virtual address 00000000
>  printing eip:
> *pde = 00000000
> Oops: 0002 [#1]
> PREEMPT
> Modules linked in :
> CPU:    0
> EIP:    0060:[<c020e494>]    Not tainted VLI
> EFLAGS: 00010292   (2.6.15-rc5)
> EIP is at kobject_add+0x94/0xd0
> eax: c0455d80   ebx: c0455b4c   ecx: 00000000 edx: c0455b68
> esi: ffffffea   edi: c0455d88   ebp: 00000000 esp: c6e8bf4c
> ds: 007b es: 007b ss: 0068
> Process swapper (pid = 1 threadinfo = c6e8a00 task = c6e88a50)
> Stack : c0455b4c ffffffea c0455d20 c020e4f2 00000000 c0455b38 c0455b4c c0455b38
>         c0455b4c c0294b12 c0455b4c c040e7c2 c03cdd36 c0455b38 00000000 00000000
>         00000000 c0295542 00000000 c021fa65 c011d377 c0411638 00000000 c04ed0dc
> Call Trace:
>  [<c020e4f2>] kobject_register+0x22/0x70
>  [<c0294b12>] bus_add_driver+0x52/0xc0
>  [<c0295542>] driver_register+0x32/0x40
>  [<c0214a65>] pcie_start_thread+0x15/0x60
>  [<c011d377>] printk+0x17/0x20
>  [<c04ed0dc>] pcied_init+0x1c/0xa0
>  [<c04ed055>] pci_proc_init+0x65/0x70
>  [<c04da83b>] do_init_calls+0x2b/0xc0
>  [<c01002a0>] init+0x0/0x160
>  [<c01002a0>] init+0x0/0x160
>  [<c01002d7>] init+0x37/0x160
>  [<c01013c9>] kernel_thread_helper+0x5/0xc
> Code: 74 df 89 f8 e8 ce 02 00 00 eb d6 b8 01 00 00 00 e8 42 af f0 ff 85 ff 74 36
>  8b 43 28 8d 53 1c 83 c0 08 89 43 1c 8b 48 04 89 50 04 <89> 11 89 4a 04 b8 01 00
>  00 00 e8 5d af f0 ff b8 00 e0 ff ff 21
>  <0>Kernel panic - not syncing: Attempted to kill init!
> 

Looks like this:

                list_add_tail(&kobj->entry,&kobj->kset->list);

went oops over null pointers in kobj->kset->list.

At a wild guess, I'd say that pcie_port_bus_register() hasn't run yet.
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