Not able to get crash dump

[Vivek Satpute]

Neha,

Are you trying to get coredump on virtual box and added extra virtual
CPU to that guest virtual machine ?


-Vivek

On Sat, Aug 3, 2013 at 10:48 AM, anish singh
<anish198519851985 at gmail.com> wrote:
>
> On Aug 3, 2013 3:02 AM, "neha naik" <nehanaik27 at gmail.com> wrote:
>>
>> Hi All,
>>  I looked into my issue and i had only one cpu  on that machine and i was
>> getting messages like process # waiting for # secs.
>>  My theory is that this process was of doing some kind of busy looping on
>> that cpu so that the operating system could
>>  not even generate a dump.
>>   The moment i increased the number of cpus i  got the dump. I am just
>> posting this
> How did you do that?How can you limit the number of cpus?I wonder if there
> is some sysfs control for that?
>
> because someone else may find it useful.
>>
>> Regards,
>> Neha
>>
>> On Thu, May 30, 2013 at 11:44 AM, <Valdis.Kletnieks at vt.edu> wrote:
>>>
>>> On Thu, 30 May 2013 11:31:49 -0600, neha naik said:
>>>
>>> >   I have loaded the linux crashdump on ubuntu machine. I can manually
>>> > generate the crashdump by the 'echo c > /proc/sysrq-trigger'.
>>> > However, i am having a panic in a module i have written, which is not
>>> > generating a core dump. I simply see the stack in the console and it
>>> > kind of
>>> > hangs there. I have to manually power it off and power it on ...
>>> >    Can someone explain why this happens? Is it because the kernel has
>>> > gone
>>> > into such a state that it cannot even follow the procedure for
>>> > crash dump.
>>>
>>> Most likely, your module isn't in fact panic'ing, but oops'ing.
>>> There's a number of kernel variables that control whether to panic.
>>>
>>> ls -l /proc/sys/kernel/*panic*
>>>
>>> and for example 'echo 1 > /proc/sys/kernel/panic_on_oops' will cause
>>> a panic if something oops'es.
>>
>>
>>
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