Avi Nehori wrote:
> Jay,
> try to set an hardware breakpoint to a global variable and then modify it .
> the system will not drop into kdb in this case.
Hi Avi,
I reprodued the problem. KDB hardware breakpoint is triggered on
access to a function, but not on value changes to a global variable.
It would be nice, isn't it? Hmmm...
- jay
>
>
> Jay Lan wrote:
>> Avi Nehori wrote:
>>
>>> Jay,
>>> the patch didnt work for me.
>>> I'm still looking for a resolution...
>>>
>> Hmmm, i just tested with Konstantin's patch on 2.6.25 and
>> 2.6.26-rc3, and it seemed to work for me.
>>
>>
>>
>>> Entering kdb (current=0xf7841c80, pid 0) on processor 1 due to Keyboard
>>> Entry
>>>
>> [1]kdb> bpha do_sync
>> Forced Instruction(Register) BP #0 at 0xc017b6a4 (do_sync)
>> is enabled in dr0 globally
>> [1]kdb> go
>>
>> I set up a global hardware breakpoint at do_sync here.
>> Then i entered 'sync' command from a shell. The system dropped into KDB:
>>
>> Instruction(Register) breakpoint #0 at 0xc017b6a4
>> 0xc017b6a4 do_sync: push %ebx
>>
>> Entering kdb (0xf72a23a0, pid 5473) on processor 2 due to Debug @ 0xc017b6a4
>> [2]kdb>
>>
>> You are testing a 2.4.21 kernel... I do not know if KDB support i386
>> in 2.4.21 at all.
>>
>> Keith Owens did a tremendous job in making KDB backtrace working on
>> x86_64/i386 and fixed other bugs along the way, but his work did not
>> complete until 2.6.23. My brief effort of back porting the x86_64/i386
>> KDB support to sles10sp2 (2.6.16 based) and rhel5.2 (2.6.18 based)
>> did not work well. So, honestly, i recommand you move up to 2.6.23
>> or later.
>>
>> Thanks,
>> - jay
>>
>>
>>> Jay Lan wrote:
>>>
>>>> Hi Avi,
>>>>
>>>> Did Konstantin's patch work for you? His patch caused ia64
>>>> compilation to fail, but i would like to know if his patch
>>>> work for you on i386.
>>>>
>>>> Thanks!
>>>>
>>>> - jay
>>>>
>>>>
>>>> Scanned by Check Point Total Security Gateway.
>>>>
>>>>
>>>>
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