Hi,
 Yes. I was trying to get coredump on virtual box and added extra virtual
CPU to the guest virtual machine.

Regards,
Neha

On Mon, Aug 5, 2013 at 12:44 PM, Vivek Satpute [off-list ref]wrote:

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
[off-list ref] wrote:

quoted

On Aug 3, 2013 3:02 AM, "neha naik" [off-list ref] wrote:

quoted

Hi All,
 I looked into my issue and i had only one cpu  on that machine and i

was

quoted

quoted

getting messages like process # waiting for # secs.
 My theory is that this process was of doing some kind of busy looping

on

quoted

quoted

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

quoted

is some sysfs control for that?

because someone else may find it useful.

quoted

Regards,
Neha

On Thu, May 30, 2013 at 11:44 AM, [off-list ref] wrote:

quoted

On Thu, 30 May 2013 11:31:49 -0600, neha naik said:

quoted

  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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