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问题原因是合入CORE特性时合入了前置补丁 db16c1fe92d7ba7d39061（bpf: Generate BTF_KIND_FLOAT when linking vmlinux）, pahole 版本 >= v1.21时，使能--btf_gen_floats，但是 BTF_KIND_FLOAT相关特性没有全部合入导致btf解析问题，需回合如下补丁：
7c782ab8b72f bpf: Document BTF_KIND_FLOAT in btf.rst
fe86e5d1c508 selftests/bpf: Add BTF_KIND_FLOAT to the existing deduplication tests
dc4e290bd211 selftest/bpf: Add BTF_KIND_FLOAT tests
dc30a6c2b97e bpf: Add BTF_KIND_FLOAT support
8346b8684060 selftests/bpf: Use the 25th bit in the "invalid BTF_INFO" test
37204927c59f tools/bpftool: Add BTF_KIND_FLOAT support

使用 pahole v1.21 和 v1.23分别验证，btf 和 core的selftest用例，都ok
[root@localhost bpf]# ./test_progs -t btf
#9/1 struct test #1:OK
#9/2 struct test #2:OK
#9/3 struct test #3 Invalid member offset:OK
#9/4 global data test #1:OK
#9/5 global data test #2:OK
#9/6 global data test #3:OK
...
#51/2 null_check:OK
#51/3 weak_ksyms:OK
#51/4 weak_ksyms_lskel:OK
#51/5 write_check:OK
#51 ksyms_btf:OK
#82 resolve_btfids:OK
#95 snprintf_btf:OK
Summary: 11/210 PASSED, 0 SKIPPED, 0 FAILED
[root@localhost bpf]# ./test_progs -t core
#25 core_autosize:OK
#26/1 default search path:OK
#26/2 custom values:OK
#26/3 tristate (y):OK
#26/4 tristate (n):OK
#26/5 tristate (m):OK
#26/6 tristate (int):OK
#26/7 tristate (bad):OK
#26/8 bool (y):OK
#26/9 bool (n):OK
#26/10 bool (tristate):OK
#26/11 bool (int):OK
#26/12 char (tristate):OK
#26/13 char (bad):OK
#26/14 char (empty):OK
#26/15 char (str):OK
#26/16 str (empty):OK
#26/17 str (padded):OK
...
#29/58 size:OK
#29/59 size___diff_sz:OK
#29/60 size___err_ambiguous:OK
#29/61 type_based:OK
#29/62 type_based___all_missing:OK
#29/63 type_based___diff_sz:OK
#29/64 type_based___incompat:OK
#29/65 type_based___fn_wrong_args:OK
#29/66 type_id:OK
#29/67 type_id___missing_targets:OK
#29/68 enumval:OK
#29/69 enumval___diff:OK
#29/70 enumval___val3_missing:OK
#29/71 enumval___err_missing:OK
#29 core_reloc:OK
#30 core_retro:OK
Summary: 6/107 PASSED, 0 SKIPPED, 0 FAILED