CONFIG_CRASH_DUMP is not available for the selected architecture x86.
Result is shown for architecture s390

kernel crash dumps

modulename: sclp_sdias.ko

and/or

crash_dump.ko

configname: CONFIG_CRASH_DUMP

Linux Kernel Configuration
└─>Dump support
└─>kernel crash dumps
In linux kernel since version 2.6.13 (release Date: 2005-08-28)
Generate crash dump after being started by kexec.
Crash dump kernels are loaded in the main kernel with kexec-tools
into a specially reserved region and then later executed after
a crash by kdump/kexec.
Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this.
This option also enables s390 zfcpdump.
See also <file:Documentation/s390/zfcpdump.rst>
source code:
selects
CONFIG_KEXEC