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SubjectRe: Capturing crash with 4.6.0 and above kernel does not work
[Let's add kdump people]

On Wed 24-08-16 16:38:56, Himanshu Madhani wrote:
> Hello list,
>
> I am wondering if anybody has issue capturing crash dump with the 4.6.0 and above kenrel.
>
> I have a system, when booted in 4.5.7 kernel is able to capture crash dump.
> However, when I boot this system in 4.6.4 and 4.7.2 kernel, crash dump is not
> able to capture any crash.
>
> I am still facing same issue with 4.8.0-rc2+ kernel and from the error at the command prompt,
> it seems like kexec is ignoring “crashkenrel” parameter.
>
> I added below information in https://bugzilla.kernel.org/show_bug.cgi?id=119291.
>
> # uname -r
> 4.8.0-rc2+
>
> # cat /proc/cmdline
> ro root=/dev/mapper/vg_dut4110-lv_root rd_NO_LUKS KEYBOARDTYPE=pc KEYTABLE=us LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=512M rd_LVM_LV=vg_dut4110/lv_swap rd_LVM_LV=vg_dut4110/lv_root rd_NO_DM rhgb quiet
>
> # service kdump status
> Kdump is not operational
>
> # service kdump start
> Memory for crashkernel is not reserved
> Please reserve memory by passing "crashkernel=X@Y" parameter to the kernel
> Starting kdump: [FAILED]

It smells like the crash kernel reservation has failed. Could you
provide the full kernel log?

> message file confirms that kexec was not able to start the service
>
> Aug 15 10:41:17 dut4110 kdump: kexec: failed to load kdump kernel
> Aug 15 10:41:17 dut4110 kdump: failed to start up
>
> Note, that same option is able to load kdump service for 4.5.7 kernel.
>
> I can provide any details needed to help resolve this issue.
>
> Thanks,
> - Himanshu
>

--
Michal Hocko
SUSE Labs

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