UBSAN: runtime error: call to function free_user_var through pointer to incorrect function type

export UBSAN_OPTIONS=print_stacktrace=1:report_error_type=1

rm -Rf data tmp 

mkdir tmp 

./scripts/mariadb-install-db --no-defaults --force --auth-root-authentication-method=normal --basedir=${PWD} --tmpdir=${PWD}/tmp --datadir=${PWD}/data

/test/10.6_dbg_san/mysys/hash.c:135:7: runtime error: call to function free_user_var through pointer to incorrect function type 'void (*)(void *)'

/test/10.6_dbg_san/sql/sql_class.cc:98: note: free_user_var defined here

    #0 0x5632f4ae7593 in my_hash_free_elements /test/10.6_dbg_san/mysys/hash.c:135:7

    #1 0x5632f4ae70e1 in my_hash_free /test/10.6_dbg_san/mysys/hash.c:157:3

    #2 0x5632ee747dab in THD::cleanup() /test/10.6_dbg_san/sql/sql_class.cc:1649:3

    #3 0x5632ee74f176 in THD::free_connection() /test/10.6_dbg_san/sql/sql_class.cc:1692:4

    #4 0x5632ee751e24 in THD::~THD() /test/10.6_dbg_san/sql/sql_class.cc:1780:5

    #5 0x5632ee7548df in THD::~THD() /test/10.6_dbg_san/sql/sql_class.cc:1751:1

    #6 0x5632eebcab5e in bootstrap(st_mysql_file*) /test/10.6_dbg_san/sql/sql_parse.cc:1111:3

    #7 0x5632ee082328 in mysqld_main(int, char**) /test/10.6_dbg_san/sql/mysqld.cc:5888:26

    #8 0x5632ee06c863 in main /test/10.6_dbg_san/sql/main.cc:34:10

    #9 0x148b1242a1c9 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16

    #10 0x148b1242a28a in __libc_start_main csu/../csu/libc-start.c:360:3

    #11 0x5632edf91034 in _start (/test/UBASAN_MD271124-mariadb-10.6.21-linux-x86_64-dbg/bin/mariadbd+0x3eb8034) (BuildId: 3cd87cd3953ac9cf3a930328b34dbd55d44c8146)

SUMMARY: UndefinedBehaviorSanitizer: function-type-mismatch /test/10.6_dbg_san/mysys/hash.c:135:7

sudo apt install clang llvm-18 llvm-18-linker-tools llvm-18-runtime llvm-18-tools llvm-18-dev libstdc++-14-dev llvm-dev llvm-17-linker-tools  # llvm-17-linker-tools installs /usr/lib/llvm-17/lib/LLVMgold.so, which is needed for compilation, and LLVMgold.so is no longer included in LLVM 18

sudo ln -s /usr/lib/llvm-17/lib/LLVMgold.so /usr/lib/llvm-18/lib/LLVMgold.so

...

export UBSAN_OPTIONS=print_stacktrace=1:report_error_type=1