Crash dump?

[Satya Naik]

Hi ,

kdump need 2 kernel primary and secondary. Primary will be panicked, then
secondary will do capture coredump.

In boot loader/ kernel command line specify crashkernel=256MB or more,
ensure secondary kernel is small in size so that it can be boot within this
memory, oom should not happen.

Primary config:
CONFIG_SYSFS=y
CONFIG_KEXEC=y
CONFIG_DEBUG_INFO=y

Secondary Config:
CONFIG_PHYSICAL_START=0x100000
CONFIG_RELOCATABLE=y
CONFIG_CRASH_DUMP=y

load secondary kernel using
kexec -p  <>

After kernel panic, secondary kernel will be invoked. The secondary kernel
should save core from /proc/vmcore  and reboot again.

Refer kdump kernel docs :
https://www.kernel.org/doc/Documentation/kdump/kdump.txt

Thanks,
Satya

On Fri, May 15, 2020 at 11:17 PM 慕冬亮 <mudongliangabcd at gmail.com> wrote:

>
>
> On May 15, 2020, at 12:47 PM, Subhashini Rao Beerisetty <
> subhashbeerisetty at gmail.com> wrote:
>
> Hi all,
>
> In  Kernel, what needs to be configured to get the crash dump?
> Can someone clarify me with the sequence of steps to get the crash dump..
>
>
> Some materials for specific Linux distributions(e.g., Redhat, Debian):
>
> https://mudongliang.github.io/2018/07/02/debian-enable-kernel-dump.html
>
>
> https://www.bentasker.co.uk/documentation/linux/312-installing-and-configuring-kdump-on-debian-jessie
>
>
> https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/kernel_administration_guide/kernel_crash_dump_guide
>
> https://fedoraproject.org/wiki/How_to_use_kdump_to_debug_kernel_crashes
>
>
>
> Thanks,
>
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