UBSAN: nullptr-with-offset: runtime error: applying zero offset to null pointer in check_rules and in init_weight_level

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/11.7_dbg_san/strings/ctype-uca.c:33746:43: runtime error: applying zero offset to null pointer

    #0 0x55ab8028f70d in check_rules /test/11.7_dbg_san/strings/ctype-uca.c:33746:43

    #1 0x55ab8028d7d6 in init_weight_level /test/11.7_dbg_san/strings/ctype-uca.c:34377:7

    #2 0x55ab8028d402 in my_uca_init_levels /test/11.7_dbg_san/strings/ctype-uca.c:34573:9

    #3 0x55ab80284ef2 in my_uca_info_init /test/11.7_dbg_san/strings/ctype-uca.c:34594:10

    #4 0x55ab80284143 in create_tailoring /test/11.7_dbg_san/strings/ctype-uca.c:34675:13

    #5 0x55ab80263752 in my_coll_init_uca /test/11.7_dbg_san/strings/ctype-uca.c:34492:10

    #6 0x55ab80271ac4 in my_uca_coll_init_utf8mb4 /test/11.7_dbg_san/strings/ctype-uca.c:36579:7

    #7 0x55ab7ffa246c in my_ci_init_collation /test/11.7_dbg_san/include/m_ctype.h:1388:10

    #8 0x55ab7ff98604 in get_internal_charset /test/11.7_dbg_san/mysys/charset.c:902:13

    #9 0x55ab7ff9892d in my_collation_get_by_name /test/11.7_dbg_san/mysys/charset.c:967:19

    #10 0x55ab7b7975de in Charset_loader_mysys::get_exact_collation(char const*, unsigned long) /test/11.7_dbg_san/include/my_sys.h:1221:12

    #11 0x55ab7b78d1a6 in Charset_loader_mysys::get_exact_collation_by_context_name(charset_info_st const*, char const*, unsigned long) /test/11.7_dbg_san/include/my_sys.h:1255:12

    #12 0x55ab7b7977d6 in Charset_loader_mysys::get_context_collation(char const*, unsigned long) /test/11.7_dbg_san/include/my_sys.h:1236:12

    #13 0x55ab7b79165f in Charset_loader_server::get_context_collation_or_error(char const*, unsigned long) /test/11.7_dbg_san/sql/lex_charset.h:91:23

    #14 0x55ab7b7913b0 in Lex_extended_collation_st::set_by_name(char const*, unsigned long) /test/11.7_dbg_san/sql/lex_charset.cc:379:22

    #15 0x55ab7b798fd9 in Charset_collation_map_st::insert_or_replace(st_mysql_const_lex_string const&, st_mysql_const_lex_string const&, bool, unsigned long) /test/11.7_dbg_san/sql/charset_collations.cc:72:11

    #16 0x55ab7b799433 in Charset_collation_map_st::from_text(st_mysql_const_lex_string const&, unsigned long) /test/11.7_dbg_san/sql/charset_collations.cc:106:11

    #17 0x55ab7911bda4 in init_common_variables() /test/11.7_dbg_san/sql/mysqld.cc:4303:35

    #18 0x55ab79115397 in mysqld_main(int, char**) /test/11.7_dbg_san/sql/mysqld.cc:5938:7

    #19 0x55ab791004a3 in main /test/11.7_dbg_san/sql/main.cc:34:10

    #20 0x14f77a02a1c9 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16

    #21 0x14f77a02a28a in __libc_start_main csu/../csu/libc-start.c:360:3

    #22 0x55ab79024c74 in _start (/test/UBASAN_MD271124-mariadb-11.7.1-linux-x86_64-dbg/bin/mariadbd+0x420ac74) (BuildId: 4ffc5d87b420973421d7e440cab2c81981d3640e)

SUMMARY: UndefinedBehaviorSanitizer: nullptr-with-offset /test/11.7_dbg_san/strings/ctype-uca.c:33746:43

/test/11.7_dbg_san/strings/ctype-uca.c:34395:43: runtime error: applying zero offset to null pointer

    #0 0x55ab8028dfe9 in init_weight_level /test/11.7_dbg_san/strings/ctype-uca.c:34395:43

    #1 0x55ab8028d402 in my_uca_init_levels /test/11.7_dbg_san/strings/ctype-uca.c:34573:9

    #2 0x55ab80284ef2 in my_uca_info_init /test/11.7_dbg_san/strings/ctype-uca.c:34594:10

    #3 0x55ab80284143 in create_tailoring /test/11.7_dbg_san/strings/ctype-uca.c:34675:13

    #4 0x55ab80263752 in my_coll_init_uca /test/11.7_dbg_san/strings/ctype-uca.c:34492:10

    #5 0x55ab80271ac4 in my_uca_coll_init_utf8mb4 /test/11.7_dbg_san/strings/ctype-uca.c:36579:7

    #6 0x55ab7ffa246c in my_ci_init_collation /test/11.7_dbg_san/include/m_ctype.h:1388:10

    #7 0x55ab7ff98604 in get_internal_charset /test/11.7_dbg_san/mysys/charset.c:902:13

    #8 0x55ab7ff9892d in my_collation_get_by_name /test/11.7_dbg_san/mysys/charset.c:967:19

    #9 0x55ab7b7975de in Charset_loader_mysys::get_exact_collation(char const*, unsigned long) /test/11.7_dbg_san/include/my_sys.h:1221:12

    #10 0x55ab7b78d1a6 in Charset_loader_mysys::get_exact_collation_by_context_name(charset_info_st const*, char const*, unsigned long) /test/11.7_dbg_san/include/my_sys.h:1255:12

    #11 0x55ab7b7977d6 in Charset_loader_mysys::get_context_collation(char const*, unsigned long) /test/11.7_dbg_san/include/my_sys.h:1236:12

    #12 0x55ab7b79165f in Charset_loader_server::get_context_collation_or_error(char const*, unsigned long) /test/11.7_dbg_san/sql/lex_charset.h:91:23

    #13 0x55ab7b7913b0 in Lex_extended_collation_st::set_by_name(char const*, unsigned long) /test/11.7_dbg_san/sql/lex_charset.cc:379:22

    #14 0x55ab7b798fd9 in Charset_collation_map_st::insert_or_replace(st_mysql_const_lex_string const&, st_mysql_const_lex_string const&, bool, unsigned long) /test/11.7_dbg_san/sql/charset_collations.cc:72:11

    #15 0x55ab7b799433 in Charset_collation_map_st::from_text(st_mysql_const_lex_string const&, unsigned long) /test/11.7_dbg_san/sql/charset_collations.cc:106:11

    #16 0x55ab7911bda4 in init_common_variables() /test/11.7_dbg_san/sql/mysqld.cc:4303:35

    #17 0x55ab79115397 in mysqld_main(int, char**) /test/11.7_dbg_san/sql/mysqld.cc:5938:7

    #18 0x55ab791004a3 in main /test/11.7_dbg_san/sql/main.cc:34:10

    #19 0x14f77a02a1c9 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16

    #20 0x14f77a02a28a in __libc_start_main csu/../csu/libc-start.c:360:3

    #21 0x55ab79024c74 in _start (/test/UBASAN_MD271124-mariadb-11.7.1-linux-x86_64-dbg/bin/mariadbd+0x420ac74) (BuildId: 4ffc5d87b420973421d7e440cab2c81981d3640e)

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