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SubjectRe: PROBLEM: APIC on a Pentium Classic SMP, 2.4.21-pre2 and 2.4.21-pre3 ksymoops
> >On kernel 2.4.21-pre2, there is a kernel oops before this, with a
> >"Dereferencing NULL pointer".
>
> You didn't run that through ksymoops and post it, so how is anyone
> supposed to be able to debug it?

As only 2.4.21-pre2 and 2.4.21-pre3 kernels show this problem, I thought
it has been corrected in 2.4.21-pre4. But, as it can be very useful in
finding the problem, here are the ksymoops for 2.4.21-pre2 and
2.4.21-pre3 kernels, quite similar though.


-------------------------------------------------------------------------------
2.4.21-pre2 ksymoops
Unable to handle kernel NULL pointer dereference at virtual address 00000000
c0115da7
*pde = 00000000
Oops: 0000
CPU: 0
EIP: 0010:[<c0115da7>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246
eax: 00000000 ebx: c1163400 ecx: 00000000 edx: 00000000
esi: 00000010 edi: c116bfbb ebp: 0008e000 esp: c116bf90
ds: 0018 es: 0018 ss: 0018
Process swapper (pid: 1, stackpage=c116b000)
Stack: 00000010 ffffffff c1163400 00000010 c116bfbb 0008e000 c02fe4c9 00000000
00000001 00000000 0008e000 c116a000 c02f7fc8 c0105000 0008e000 c02fdef9
c030c7c6 c116a000 c02f87fb c0105078 00010f00 c02f7fc8 c0105000 0008e000
Call Trace: [<c0105000>] [<c0105078>] [<c0105000>] [<c0107406>] [<c0105050>]
Code: 83 3c 90 ff 0f 84 f1 00 00 00 a1 c0 80 34 c0 31 ff 89 04 24

>>EIP; c0115da7 <IO_APIC_get_PCI_irq_vector+17/130> <=====

Trace; c0105000 <_stext+0/0>
Trace; c0105078 <init+28/180>
Trace; c0105000 <_stext+0/0>
Trace; c0107406 <kernel_thread+26/30>
Trace; c0105050 <init+0/180>

Code; c0115da7 <IO_APIC_get_PCI_irq_vector+17/130>
00000000 <_EIP>:
Code; c0115da7 <IO_APIC_get_PCI_irq_vector+17/130> <=====
0: 83 3c 90 ff cmpl $0xffffffff,(%eax,%edx,4) <=====
Code; c0115dab <IO_APIC_get_PCI_irq_vector+1b/130>
4: 0f 84 f1 00 00 00 je fb <_EIP+0xfb>
Code; c0115db1 <IO_APIC_get_PCI_irq_vector+21/130>
a: a1 c0 80 34 c0 mov 0xc03480c0,%eax
Code; c0115db6 <IO_APIC_get_PCI_irq_vector+26/130>
f: 31 ff xor %edi,%edi
Code; c0115db8 <IO_APIC_get_PCI_irq_vector+28/130>
11: 89 04 24 mov %eax,(%esp,1)
<0>Kernel panic: Attempted to kill init!

-------------------------------------------------------------------------------
2.4.21-pre3 ksymoops
Unable to handle kernel NULL pointer dereference at virtual address 000000
c0115da7
*pde = 00000000
Oops: 0000
CPU: 0
EIP: 0010:[<c0115da7>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246
eax: 00000000 ebx: c1163400 ecx: 00000000 edx: 00000000
esi: 00000010 edi: c116bfbb ebp: 0008e000 esp: c116bf90
ds: 0018 es: 0018 ss: 0018
Process swapper (pid: 1, stackpage=c116b000)
Stack: 00000010 ffffffff c1163400 00000010 c116bfbb 0008e000 c02fe549 000
00000001 00000000 0008e000 c116a000 c02f7fc8 c0105000 0008e000 c02
c030c846 c116a000 c02f87fb c0105078 00010f00 c02f7fc8 c0105000 000
Call Trace: [<c0105000>] [<c0105078>] [<c0105000>] [<c0107406>] [<c010]
Code: 83 3c 90 ff 0f 84 f1 00 00 00 a1 c0 80 34 c0 31 ff 89 04 24

>>EIP; c0115da7 <IO_APIC_get_PCI_irq_vector+17/130> <=====

Trace; c0105000 <_stext+0/0>
Trace; c0105078 <init+28/180>
Trace; c0105000 <_stext+0/0>
Trace; c0107406 <kernel_thread+26/30>

Code; c0115da7 <IO_APIC_get_PCI_irq_vector+17/130>
00000000 <_EIP>:
Code; c0115da7 <IO_APIC_get_PCI_irq_vector+17/130> <=====
0: 83 3c 90 ff cmpl $0xffffffff,(%eax,%edx,4) <=====
Code; c0115dab <IO_APIC_get_PCI_irq_vector+1b/130>
4: 0f 84 f1 00 00 00 je fb <_EIP+0xfb>
Code; c0115db1 <IO_APIC_get_PCI_irq_vector+21/130>
a: a1 c0 80 34 c0 mov 0xc03480c0,%eax
Code; c0115db6 <IO_APIC_get_PCI_irq_vector+26/130>
f: 31 ff xor %edi,%edi
Code; c0115db8 <IO_APIC_get_PCI_irq_vector+28/130>
11: 89 04 24 mov %eax,(%esp,1)
<0>Kernel panic: Attempted to kill init!

-------------------------------------------------------------------------------

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