UBSAN: runtime error: applying zero offset to null pointer in my_strnxfrm_utf8mb3_general_ci, my_uca_scanner_init_any and my_uca_scanner_next_utf8mb3

SET NAMES utf8;

DO CHAR((WEIGHT_STRING (EXTRACTVALUE ((0),('t')) LEVEL 7)) USING cp852);

/test/10.5_dbg_san/strings/strcoll.inl:472:54: runtime error: applying zero offset to null pointer

SUMMARY: UndefinedBehaviorSanitizer: nullptr-with-offset /test/10.5_dbg_san/strings/strcoll.inl:472:54 

    #0 0x557849078606 in my_strnxfrm_utf8mb3_general_ci /test/10.5_dbg_san/strings/strcoll.inl:472:54

    #1 0x557845805bb9 in charset_info_st::strnxfrm(char*, unsigned long, unsigned int, char const*, unsigned long, unsigned int) const /test/10.5_dbg_san/include/m_ctype.h:871:12

    #2 0x557845805590 in Item_func_weight_string::val_str(String*) /test/10.5_dbg_san/sql/item_strfunc.cc:3732:19

    #3 0x557845778d61 in Item_str_func::val_int() /test/10.5_dbg_san/sql/item_strfunc.cc:154:16

    #4 0x5578457e570f in Item_func_char::val_str(String*) /test/10.5_dbg_san/sql/item_strfunc.cc:2986:32

    #5 0x557844428c22 in Type_handler_string_result::Item_update_null_value(Item*) const /test/10.5_dbg_san/sql/sql_type.cc:4286:16

    #6 0x5578424766d4 in Item::update_null_value() /test/10.5_dbg_san/sql/item.h:1911:28

    #7 0x557842b4d646 in Item_func::is_null() /test/10.5_dbg_san/sql/item_func.h:222:5

    #8 0x5578462db011 in mysql_do(THD*, List<Item>&) /test/10.5_dbg_san/sql/sql_do.cc:35:19

    #9 0x557842f389c8 in mysql_execute_command(THD*) /test/10.5_dbg_san/sql/sql_parse.cc:4058:10

    #10 0x557842edf4e3 in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /test/10.5_dbg_san/sql/sql_parse.cc:8237:18

    #11 0x557842ebf453 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /test/10.5_dbg_san/sql/sql_parse.cc:1891:7

    #12 0x557842ee7a19 in do_command(THD*) /test/10.5_dbg_san/sql/sql_parse.cc:1375:17

    #13 0x557843e61f30 in do_handle_one_connection(CONNECT*, bool) /test/10.5_dbg_san/sql/sql_connect.cc:1386:11

    #14 0x557843e606fd in handle_one_connection /test/10.5_dbg_san/sql/sql_connect.cc:1298:5

    #15 0x55784235ba8c in asan_thread_start(void*) asan_interceptors.cpp.o

    #16 0x154b2ca9ca93 in start_thread nptl/pthread_create.c:447:8

    #17 0x154b2cb29c3b in clone3 misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

SUMMARY: UndefinedBehaviorSanitizer: nullptr-with-offset /test/10.5_dbg_san/strings/strcoll.inl:472:54 

/test/11.7_dbg_san/strings/ctype-uca.c:32090:22: runtime error: applying zero offset to null pointer

    #0 0x5605e65733ce in my_uca_scanner_init_any /test/11.7_dbg_san/strings/ctype-uca.c:32090:22

    #1 0x5605e658ba96 in my_uca_strnxfrm_onelevel_internal_utf8mb3 /test/11.7_dbg_san/strings/ctype-uca.inl:801:3

    #2 0x5605e658b3db in my_uca_strnxfrm_onelevel_utf8mb3 /test/11.7_dbg_san/strings/ctype-uca.inl:834:25

    #3 0x5605e65409e0 in my_uca_strnxfrm_utf8mb3 /test/11.7_dbg_san/strings/ctype-uca.inl:898:7

    #4 0x5605e2f666c6 in charset_info_st::strnxfrm(char*, unsigned long, unsigned int, char const*, unsigned long, unsigned int) const /test/11.7_dbg_san/include/m_ctype.h:1119:12

    #5 0x5605e2f66007 in Item_func_weight_string::val_str(String*) /test/11.7_dbg_san/sql/item_strfunc.cc:4201:19

    #6 0x5605e2eca524 in Item_str_func::val_int() /test/11.7_dbg_san/sql/item_strfunc.cc:169:16

    #7 0x5605e2f4559b in Item_func_char::val_str(String*) /test/11.7_dbg_san/sql/item_strfunc.cc:3405:32

    #8 0x5605e1ad1f02 in Type_handler_string_result::Item_update_null_value(Item*) const /test/11.7_dbg_san/sql/sql_type.cc:4345:16

    #9 0x5605df4308d4 in Item::update_null_value() /test/11.7_dbg_san/sql/item.h:2152:28

    #10 0x5605df5edad6 in Item_func::is_null() /test/11.7_dbg_san/sql/item_func.h:243:5

    #11 0x5605e38d6a99 in mysql_do(THD*, List<Item>&) /test/11.7_dbg_san/sql/sql_do.cc:36:19

    #12 0x5605e02301c5 in mysql_execute_command(THD*, bool) /test/11.7_dbg_san/sql/sql_parse.cc:3995:10

    #13 0x5605e01d5ec9 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /test/11.7_dbg_san/sql/sql_parse.cc:7901:18

    #14 0x5605e01b6d88 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool) /test/11.7_dbg_san/sql/sql_parse.cc:1903:7

    #15 0x5605e01dfe26 in do_command(THD*, bool) /test/11.7_dbg_san/sql/sql_parse.cc:1416:17

    #16 0x5605e1341db6 in do_handle_one_connection(CONNECT*, bool) /test/11.7_dbg_san/sql/sql_connect.cc:1415:11

    #17 0x5605e1340579 in handle_one_connection /test/11.7_dbg_san/sql/sql_connect.cc:1327:5

    #18 0x5605df3895cc in asan_thread_start(void*) asan_interceptors.cpp.o

    #19 0x14901769ca93 in start_thread nptl/pthread_create.c:447:8

    #20 0x149017729c3b in clone3 misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

SUMMARY: UndefinedBehaviorSanitizer: nullptr-with-offset /test/11.7_dbg_san/strings/ctype-uca.c:32090:22 

/test/11.7_dbg_san/strings/ctype-uca-scanner_next.inl:84:23: runtime error: applying non-zero offset 1 to null pointer

    #0 0x5605e6583f1c in my_uca_scanner_next_utf8mb3 /test/11.7_dbg_san/strings/ctype-uca-scanner_next.inl:84:23

    #1 0x5605e658baa9 in my_uca_strnxfrm_onelevel_internal_utf8mb3 /test/11.7_dbg_san/strings/ctype-uca.inl:803:18

    #2 0x5605e658b3db in my_uca_strnxfrm_onelevel_utf8mb3 /test/11.7_dbg_san/strings/ctype-uca.inl:834:25

    #3 0x5605e65409e0 in my_uca_strnxfrm_utf8mb3 /test/11.7_dbg_san/strings/ctype-uca.inl:898:7

    #4 0x5605e2f666c6 in charset_info_st::strnxfrm(char*, unsigned long, unsigned int, char const*, unsigned long, unsigned int) const /test/11.7_dbg_san/include/m_ctype.h:1119:12

    #5 0x5605e2f66007 in Item_func_weight_string::val_str(String*) /test/11.7_dbg_san/sql/item_strfunc.cc:4201:19

    #6 0x5605e2eca524 in Item_str_func::val_int() /test/11.7_dbg_san/sql/item_strfunc.cc:169:16

    #7 0x5605e2f4559b in Item_func_char::val_str(String*) /test/11.7_dbg_san/sql/item_strfunc.cc:3405:32

    #8 0x5605e1ad1f02 in Type_handler_string_result::Item_update_null_value(Item*) const /test/11.7_dbg_san/sql/sql_type.cc:4345:16

    #9 0x5605df4308d4 in Item::update_null_value() /test/11.7_dbg_san/sql/item.h:2152:28

    #10 0x5605df5edad6 in Item_func::is_null() /test/11.7_dbg_san/sql/item_func.h:243:5

    #11 0x5605e38d6a99 in mysql_do(THD*, List<Item>&) /test/11.7_dbg_san/sql/sql_do.cc:36:19

    #12 0x5605e02301c5 in mysql_execute_command(THD*, bool) /test/11.7_dbg_san/sql/sql_parse.cc:3995:10

    #13 0x5605e01d5ec9 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /test/11.7_dbg_san/sql/sql_parse.cc:7901:18

    #14 0x5605e01b6d88 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool) /test/11.7_dbg_san/sql/sql_parse.cc:1903:7

    #15 0x5605e01dfe26 in do_command(THD*, bool) /test/11.7_dbg_san/sql/sql_parse.cc:1416:17

    #16 0x5605e1341db6 in do_handle_one_connection(CONNECT*, bool) /test/11.7_dbg_san/sql/sql_connect.cc:1415:11

    #17 0x5605e1340579 in handle_one_connection /test/11.7_dbg_san/sql/sql_connect.cc:1327:5

    #18 0x5605df3895cc in asan_thread_start(void*) asan_interceptors.cpp.o

    #19 0x14901769ca93 in start_thread nptl/pthread_create.c:447:8

    #20 0x149017729c3b in clone3 misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

SUMMARY: UndefinedBehaviorSanitizer: nullptr-with-nonzero-offset /test/11.7_dbg_san/strings/ctype-uca-scanner_next.inl:84:23 

Compiled with a recent version of Clang (I used Clang 18.1.3) with LLVM 18:

     # Note: 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 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

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

Compiled with: '-DCMAKE_C_COMPILER=/usr/bin/clang -DCMAKE_CXX_COMPILER=/usr/bin/clang++' and:

    -DWITH_ASAN=ON -DWITH_ASAN_SCOPE=ON -DWITH_UBSAN=ON -DWSREP_LIB_WITH_ASAN=ON

Set before execution:

    export UBSAN_OPTIONS=print_stacktrace=1:report_error_type=1   # And you may also want to supress UBSAN startup issues using 'suppressions=UBSAN.filter'. For an example of UBSAN.filter, which includes current startup issues see: https://github.com/mariadb-corporation/mariadb-qa/blob/master/UBSAN.filter