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SubjectRe: oops with kernel 2.4.5

well, my guess is that the compiler misscompiles your kernel.

stil _contrary_ to REPORTING_BUGS file you did not gave any info about
your system.

some usefull stuff you should email are (adjust it to your setup)

a)

cd /usr/src/linux
rm fs/buffer.o
make fs/buffer.o

email output of the make then find out what gcc was used (gcc,kgcc etc)
and email what gcc it was, ie
b)

gcc -v

then run following command
c)

gdb vmlinux

disassemble __remove_from_queues

in gdb run the above command and email output of all the 3 above,
then ppl on LKML might be able to help you better.

On Fri, 8 Jun 2001, szonyi calin wrote:

> Hi
> we found in logs a oops and here are the results from
> ksymoops (2.4.1)
>
> Unable to handle kernel NULL pointer dereference at
> virtual address 00000004
> c012db89
> *pde = 00000000
> Oops: 0002
> CPU: 0
> EIP: 0010:[<c012db89>]
> Using defaults from ksymoops -t elf32-i386 -a i386
> EFLAGS: 00010246
> eax: 00000000 ebx: c00725c0 ecx: c00725c0 edx:
> 00000004
> esi: c00725c0 edi: c00725c0 ebp: 00000000 esp:
> c10a9f70
> ds: 0018 es: 0018 ss: 0018
> Process kswapd (pid: 3, stackpage=c10a9000)
> Stack: c0130092 c00725c0 c1076e94 c1076e78 c025eb90
> 00000027 c00725c0 00000003
> c0126cb1 c1076e78 00000000 00000000 00000004
> 00000000 0008e000 00000000
> 00000000 00000004 00000000 0000003c c0127551
> 00000004 00000000 c10a8000
> Call Trace: [<c0130092>] [<c0126cb1>] [<c0127551>]
> [<c01275df>] [<c0105000>] [<c
> 0105463>]
> Code: 89 02 c7 41 30 00 00 00 00 31 c0 66 8b 41 0a 50
> 51 e8 0d ffUnable to handle kernel NULL pointer
> dereference at virtual address 00000004
> c012db89
> *pde = 00000000
> Oops: 0002
> CPU: 0
> EIP: 0010:[<c012db89>]
> Using defaults from ksymoops -t elf32-i386 -a i386
> EFLAGS: 00010246
> eax: 00000000 ebx: c00725c0 ecx: c00725c0 edx:
> 00000004
> esi: c00725c0 edi: c00725c0 ebp: 00000000 esp:
> c10a9f70
> ds: 0018 es: 0018 ss: 0018
> Process kswapd (pid: 3, stackpage=c10a9000)
> Stack: c0130092 c00725c0 c1076e94 c1076e78 c025eb90
> 00000027 c00725c0 00000003
> c0126cb1 c1076e78 00000000 00000000 00000004
> 00000000 0008e000 00000000
> 00000000 00000004 00000000 0000003c c0127551
> 00000004 00000000 c10a8000
> Call Trace: [<c0130092>] [<c0126cb1>] [<c0127551>]
> [<c01275df>] [<c0105000>] [<c
> 0105463>]
> Code: 89 02 c7 41 30 00 00 00 00 31 c0 66 8b 41 0a 50
> 51 e8 0d ff
> >>EIP; c012db89 <__remove_from_queues+19/34> <=====
> Trace; c0130092 <try_to_free_buffers+76/164>
> Trace; c0126cb1 <page_launder+329/810>
> Trace; c0127551 <do_try_to_free_pages+1d/58>
> Trace; c01275df <kswapd+53/e0>
> Trace; c0105000 <prepare_namespace+0/8>
> Code; c012db89 <__remove_from_queues+19/34>
> 00000000 <_EIP>:
> Code; c012db89 <__remove_from_queues+19/34> <=====
> 0: 89 02 movl %eax,(%edx)
> <=====
> Code; c012db8b <__remove_from_queues+1b/34>
> 2: c7 41 30 00 00 00 00 movl
> $0x0,0x30(%ecx)
> Code; c012db92 <__remove_from_queues+22/34>
> 9: 31 c0 xorl %eax,%eax
> Code; c012db94 <__remove_from_queues+24/34>
> b: 66 8b 41 0a movw 0xa(%ecx),%ax
> Code; c012db98 <__remove_from_queues+28/34>
> f: 50 pushl %eax
> Code; c012db99 <__remove_from_queues+29/34>
> 10: 51 pushl %ecx
> Code; c012db9a <__remove_from_queues+2a/34>
> 11: e8 0d ff 00 00 call ff23
> <_EIP+0xff23> c013daac <d_invalidate+44/60>>>EIP;
> c012db89 <__remove_from_queues+19/34> <=====
> Trace; c0130092 <try_to_free_buffers+76/164>
> Trace; c0126cb1 <page_launder+329/810>
> Trace; c0127551 <do_try_to_free_pages+1d/58>
> Trace; c01275df <kswapd+53/e0>
> Trace; c0105000 <prepare_namespace+0/8>
> Code; c012db89 <__remove_from_queues+19/34>
> 00000000 <_EIP>:
> Code; c012db89 <__remove_from_queues+19/34> <=====
> 0: 89 02 movl %eax,(%edx)
> <=====
> Code; c012db8b <__remove_from_queues+1b/34>
> 2: c7 41 30 00 00 00 00 movl
> $0x0,0x30(%ecx)
> Code; c012db92 <__remove_from_queues+22/34>
> 9: 31 c0 xorl %eax,%eax
> Code; c012db94 <__remove_from_queues+24/34>
> b: 66 8b 41 0a movw 0xa(%ecx),%ax
> Code; c012db98 <__remove_from_queues+28/34>
> f: 50 pushl %eax
> Code; c012db99 <__remove_from_queues+29/34>
> 10: 51 pushl %ecx
> Code; c012db9a <__remove_from_queues+2a/34>
> 11: e8 0d ff 00 00 call ff23
> <_EIP+0xff23> c013daac <d_invalidate+44/60>
>
> Well ?
>
>
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