Oliver Yang wrote:
> Colin Yi wrote:
>>
>> Oliver Yang Wrote:
>>> Colin Yi wrote:
>>>>
>>>> Hi,
>>>> We found a hard hang on a HP x86 system installed snv_130. firstly
>>>> I add "set snooping=1" to /etc/system
>>>> to try to get a core dump file. but it doesn't work, the system
>>>> hang more than one hour and can't enter
>>>> kmdb mode (the deadman timer is the default value). secondly I
>>>> add?set pcpslump:apic_panic_on_nmi=1? to
>>>> /etc/system, and send an NMI to OS from HP utility, The system
>>>> enters the kmdb mode this time, But the keyboard
>>>> freeze and I am not able to perform any operations in kmdb.
>>>>
>>>> Does anyone know any other way to debug this hard hang?
>>>>
>>>
>>> Have you tied using kmdb via the tip line? Sometimes using tip line
>>> is helpful.
>>
>> Doesn't work.
> I'm little bit confused.
>
> The apic_panic_on_nmi should cause a system panic, have you seen "NMI
> received" panic message on the console?
>
I meant, if you are loading kmdb with this option at same time, you can
try to boot kernel without kmdb this time. Since apic_panic_on_nmi will
trigger the code which will call panic routine directly, and this will
not require any keyboard operation.
