[Crash-utility] Unable to switch stack frames while using crash

[Shashidhara Shamaiah]

Hi Dave,

I updated the makedumpfile utility from 1.3.5 to 1.3.7 . When I run the
below command 

makedumpfile -c -d 31 -x vmlinux_temp vmcore vmcore-new
The kernel version is not supported.
The created dumpfile may be incomplete.
check_release: Can't get the kernel version.
makedumpfile Failed.

Is there any other way to extract the ELF style vmcore file from the
kdump compressed format. Please guide me.


Regards
Shashidhara

-----Original Message-----
From: crash-utility-bounces at redhat.com
[mailto:crash-utility-bounces at redhat.com] On Behalf Of Dave Anderson
Sent: Thursday, June 16, 2011 7:30 PM
To: Discussion list for crash utility usage,maintenance and development
Subject: Re: [Crash-utility] Unable to switch stack frames while using
crash



----- Original Message -----
> Hi,
> 
> Thank you Dave for your time and help.
> 
> As suggested, I will update my crash utility first and then go about
> analyzing the dump.
> 
> >>> I believe that something like this might work?:
> 
> >>>  $ makedumpfile -c -d 31 -x vmlinux_temp vmcore-old vmcore-new
> 
> I tried to use the command you suggested " makedumpfile -c -d 31 -x
> vmlinux_temp vmcore vmcore-new " . I got an error message " The kernel
> version is not supported.The created dumpfile may be incomplete.
> check_release: Can't get the kernel version"
> 
> Should I update makedumpfile utility as well? Or just updating crash
> will do?

That's a makedumpfile issue -- the message comes from here in
makedumpfile.c:

        if ((version < OLDEST_VERSION) || (LATEST_VERSION < version)) {
                MSG("The kernel version is not supported.\n");
                MSG("The created dumpfile may be incomplete.\n");
        }

where, at least in the RHEL6 version of makedumpfile (1.3.5), this
is the range:

  #define OLDEST_VERSION          KERNEL_VERSION(2, 6, 15)/*
linux-2.6.15 */
  #define LATEST_VERSION          KERNEL_VERSION(2, 6, 32)/*
linux-2.6.32 */

The upstream version of makedumpfile is now 1.3.7, which bumps
LATEST_VERSION:

  #define LATEST_VERSION          KERNEL_VERSION(2, 6, 36)/*
linux-2.6.36 */

But it's a warning message, and your vmcore-new may still be usable.

Dave



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