[Crash-utility] Reasons why kdump isn't activated

[Gallus]

Kexec is property configured: /etc/init.d/kdump status shows: "Kdump
is operational". There is no message like: "disabling kdump" in dmesg.
Instead, there are messages: "kdump: kexec: loaded kdump kernel" and
"kdump: started up".

After system-wide error occurs, kdump reacts correctly. New kernel is
started, and there are messages like: "Memory for crash kernel (0x0 to
0x0) notwithin permissible range" (this is correct, secondary kernel
starts with different kernel command line, without the crashkernel
option, because it doesn't load any third kernel, as we know) and
"disabling kdump". But, there is no message: "kdump: saved a vmcore to
/var/crash/*" and no vmcore is saved.

When I tested exactly the same box with manually triggered system
crash (echo c >/proc/sysrq....), everything was the same except that
the "kdump: saved a vmcore to /var/crash/*" was emitted and the vmcore
was saved.

Regards,
Gallus

On 9 February 2010 14:59, Chandan12 K <chandan12.k at tcs.com> wrote:
>
> First you need to figure out the reason of your system failure. If its complete power failure, then kexec wont be able to load a new kernel in current context.
> Secondly, is kexec properly configured in your system?
>
> Chandan Kumar
> Tata Consultancy Services
> Mailto: chandan12.k at tcs.com
> Website: http://www.tcs.com
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