On Mon, 9 Dec 2002 13:49:35 +0800 ,
"Zhang, Sonic" <[EMAIL PROTECTED]> wrote:
> I encounter this problem with kdb-v2.5-2.4.19 under pristine kernel
>2.4.19 on the i386 architecture.
> After I set a break point with command "bp" within exception routine
>"divide_error" and order the KDB to "go", the system reboot abnormally.
>
> Do you think it is a bug in KDB?
>
> Steps:
> 1. Enter KDB by Pause key
> 2. pb divide_error + 0xa
> 3. go
>
> Result:
> The system reboot abnormally.
[0]kdb> id divide_error
0xc01077c4 divide_error: push $0x0
0xc01077c6 divide_error+0x2: push $0xc0107e10
0xc01077cb divide_error+0x7: nop
0xc01077cc error_code: push %ds
0xc01077cd error_code+0x1: push %eax
0xc01077ce error_code+0x2: xor %eax,%eax
0xc01077d0 error_code+0x4: push %ebp
0xc01077d1 error_code+0x5: push %edi
0xc01077d2 error_code+0x6: push %esi
0xc01077d3 error_code+0x7: push %edx
0xc01077d4 error_code+0x8: dec %eax
0xc01077d5 error_code+0x9: push %ecx
0xc01077d6 error_code+0xa: push %ebx
0xc01077d7 error_code+0xb: cld
0xc01077d8 error_code+0xc: mov %es,%ecx
0xc01077da error_code+0xe: mov 0x24(%esp,1),%esi
[0]kdb> bp divide_error+0xa
Instruction(i) BP #0 at 0xc01077ce (error_code+0x2)
is enabled globally adjust 1
divide_error+0xa is past the end of divide_error, it is error_code+0x2.
The debug handler branches to error_code, gets a tripple fault and
reboots the machine. Do not try to debug any routines on the low level
error paths, in-kernel debuggers cannot handle that.
