Comment 2 for bug 2037398

$ sudo /tmp/tmp.u3jP6LAlnj/usr/local/sbin/kexec --debug -l -c /boot/vmlinuz-6.5.0-6-generic
arch_process_options:178: command_line: (null)
arch_process_options:180: initrd: (null)
arch_process_options:182: dtb: (null)
arch_process_options:185: console: (null)
Try gzip decompression.
kernel: 0xffff8e4ef010 kernel_size: 0xda0988
set_phys_offset: phys_offset : 0000000040000000 (method : vmcoreinfo pt_note)
get_memory_ranges:+[0] 0000000040000000 - 000000023c58ffff
get_memory_ranges:- 00000000fa000000 - 00000000ffffffff
get_memory_ranges:- 00000001001dc000 - 00000001001dcfff
get_memory_ranges:- 0000000100210000 - 000000010021ffff
get_memory_ranges:- 0000000100220000 - 000000010022ffff
get_memory_ranges:- 0000000100230000 - 000000010023ffff
get_memory_ranges:- 0000000109540000 - 000000010a0fffff
get_memory_ranges:- 000000022fb50000 - 000000022fb50fff
get_memory_ranges:- 000000022fd5d000 - 000000022fd64fff
get_memory_ranges:- 0000000234400000 - 000000023c3fffff
get_memory_ranges:- 000000023c4a6000 - 000000023c4a6fff
get_memory_ranges:- 000000023c580000 - 000000023c58ffff
get_memory_ranges:+[9] 000000023c730000 - 000000023fbfffff
get_memory_ranges:- 000000023dbf1000 - 000000023e7f1fff
get_memory_ranges:- 000000023eaff000 - 000000023ebbefff
get_memory_ranges:- 000000023ebbf000 - 000000023ebbffff
get_memory_ranges:- 000000023ebc0000 - 000000023ebfffff
get_memory_ranges:- 000000023ec02000 - 000000023ec03fff
get_memory_ranges:- 000000023ec04000 - 000000023ec04fff
get_memory_ranges:- 000000023ec05000 - 000000023fbfffff
get_memory_ranges:+[12] 000000023ffe0000 - 000000023fffffff
get_memory_ranges:- 000000023ffe0000 - 000000023fffffff
System RAM ranges;
0000000040000000-00000000f9ffffff (0)
0000000100000000-00000001001dbfff (0)
00000001001dd000-000000010020ffff (0)
0000000100240000-000000010953ffff (0)
000000010a100000-000000022fb4ffff (0)
000000022fb51000-000000022fd5cfff (0)
000000022fd65000-00000002343fffff (0)
000000023c400000-000000023c4a5fff (0)
000000023c4a7000-000000023c57ffff (0)
000000023c730000-000000023dbf0fff (0)
000000023e7f2000-000000023eafefff (0)
000000023ec00000-000000023ec01fff (0)
elf_arm64_probe: Not an ELF executable.
image_arm64_probe: Bad arm64 image header.
pez_arm64_probe: PROBE.
pez_prepare: kexec can only decompress gziped and lzma images.
Cannot determine the file type of /boot/vmlinuz-6.5.0-6-generic

Even git snapshot of kexec-tools cannot handle zstd commpressed zimg