makedumpfile fails with --mem-usage and --show-stats options on /proc/kcore

Issue

• Unable to estimate the disk space required for the kdump dump file using the makedumpfile command.

# makedumpfile --mem-usage /proc/kcore
read_from_vmcore: Can't read the dump memory(/proc/kcore). Bad address
readpage_elf: Can't read the dump memory(/proc/kcore).
readmem: type_addr: 1, addr:236e00000, size:4096
exclude_zero_pages_cyclic: Can't get the page data(pfn:236e00, max_mapnr:240000).
create_2nd_bitmap: Can't exclude pages filled with zero for creating an ELF dumpfile.

makedumpfile Failed.

• The following errors occur when executing makedumpfile with the --mem-usage or --show-stats options on /proc/kcore.

# makedumpfile --mem-usage /proc/kcore
read_from_vmcore: Can't read the dump memory(/proc/kcore). Bad address
readpage_elf: Can't read the dump memory(/proc/kcore).
readmem: type_addr: 1, addr:236e00000, size:4096
exclude_zero_pages_cyclic: Can't get the page data(pfn:236e00, max_mapnr:240000).
create_2nd_bitmap: Can't exclude pages filled with zero for creating an ELF dumpfile.

makedumpfile Failed.

# makedumpfile -F -l -d 31 /proc/kcore --dry-run --show-stats
Checking for memory holes                         : [100.0 %] |                  STEP [Checking for memory holes  ] : 0.007916 seconds
Excluding unnecessary pages                       : [100.0 %] \                  STEP [Excluding unnecessary pages] : 0.041266 seconds
read_from_vmcore: Can't read the dump memory(/proc/kcore). Bad address
readpage_elf: Can't read the dump memory(/proc/kcore).
readmem: type_addr: 1, addr:236e00000, size:4096
read_pfn: Can't get the page data.
STEP [Copying data               ] : 0.764934 seconds

makedumpfile Failed.