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I do not understand the purpose of the mount_root_run_init action in kdump.conf:

# default <reboot | halt | poweroff | shell | mount_root_run_init>
#                       - Action to preform in case dumping to intended target
#                         fails. If no default action is specified, "reboot"
#                         is assumed default.
#
#                         reboot: If the default action is reboot simply reboot
#                                 the system and loose the core that you are
#                                 trying to retrieve.
#                         halt:   If the default action is halt, then simply
#                                 halt the system after attempting to capture
#                                 a vmcore, regardless of success or failure.
#                         poweroff: The system will be powered down
#                         shell:  If the default action is shell, then drop to
#                                 an hush session inside the initramfs from
#                                 where you can try to record the core manually.
#                                 Exiting this shell reboots the system.
#            mount_root_run_init: Mount root filesystem and run init. Kdump
#                                   initscript will try to save dump to root
#                                   filesystem in /var/crash dir. This will
#                                   likely require a lot more memory to
#                                   be reserved for kdump kernel.

What I undestood is that when current kernel is crashed, kdump boots into second kernel which was already reserved in memory and then it collects the kernel core dump to a specified target.

So, it does the default action if it fails to collect to a specified target.

Why does it mount root filesystem and run init? To make the / filesystem available to the second kernel and to load required services/modules for the collecting process?

If it's the case, how was the following supposed to work (as / filesystem is not mounted in second kernel by that time)

action to preform in case dumping to intended target fails.

Say, I mentioned /var/custom-crash to be my target path, will it work?

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