On startup: UBSAN: runtime error: applying zero offset to null pointer in skip_trailing_space and my_hash_sort_utf8mb3_general1400_nopad_as_ci

/test/11.5_opt_san/strings/strings_def.h:83:25: runtime error: applying zero offset to null pointer

    #0 0x560775ce5cab in skip_trailing_space /test/11.5_opt_san/strings/strings_def.h:83:25

    #1 0x560775ce9de9 in my_hash_sort_utf8mb3_general1400_as_ci /test/11.5_opt_san/strings/ctype-utf8.c:567:19

    #2 0x560775b2038d in my_ci_hash_sort /test/11.5_opt_san/include/m_ctype.h:1413:3

    #3 0x560775b2038d in my_hash_sort /test/11.5_opt_san/mysys/hash.c:48:3

    #4 0x560775b21f2f in my_hash_insert /test/11.5_opt_san/mysys/hash.c:405:20

    #5 0x5607743c1c0b in Native_functions_hash::append(Native_func_registry const*, unsigned long) /test/11.5_opt_san/sql/item_create.cc:6516:9

    #6 0x5607743c1c0b in Native_functions_hash::replace(Native_func_registry const*, unsigned long) /test/11.5_opt_san/sql/item_create.h:331:5

    #7 0x5607743c1a3f in item_create_init() /test/11.5_opt_san/sql/item_create.cc:6632:34

    #8 0x56077291bdc5 in init_common_variables() /test/11.5_opt_san/sql/mysqld.cc:4145:7

    #9 0x5607729160cd in mysqld_main(int, char**) /test/11.5_opt_san/sql/mysqld.cc:5747:7

    #10 0x14bbe48280cf in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16

    #11 0x14bbe4828188 in __libc_start_main csu/../csu/libc-start.c:360:3

    #12 0x560772833a74 in _start (/test/UBASAN_MD170524-mariadb-11.5.0-linux-x86_64-opt/bin/mariadbd+0x1eeaa74) (BuildId: 625cf9b723786356a41e5db3b224cfc14cafba37)

SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /test/11.5_opt_san/strings/strings_def.h:83:25 in 

/test/11.5_opt_san/strings/ctype-utf8.c:547:21: runtime error: applying zero offset to null pointer

    #0 0x560775cea26b in my_hash_sort_utf8mb3_general1400_nopad_as_ci /test/11.5_opt_san/strings/ctype-utf8.c:547:21

    #1 0x560775cea26b in my_hash_sort_utf8mb3_general1400_as_ci /test/11.5_opt_san/strings/ctype-utf8.c:568:3

    #2 0x560775b2038d in my_ci_hash_sort /test/11.5_opt_san/include/m_ctype.h:1413:3

    #3 0x560775b2038d in my_hash_sort /test/11.5_opt_san/mysys/hash.c:48:3

    #4 0x560775b21f2f in my_hash_insert /test/11.5_opt_san/mysys/hash.c:405:20

    #5 0x5607743c1c0b in Native_functions_hash::append(Native_func_registry const*, unsigned long) /test/11.5_opt_san/sql/item_create.cc:6516:9

    #6 0x5607743c1c0b in Native_functions_hash::replace(Native_func_registry const*, unsigned long) /test/11.5_opt_san/sql/item_create.h:331:5

    #7 0x5607743c1a3f in item_create_init() /test/11.5_opt_san/sql/item_create.cc:6632:34

    #8 0x56077291bdc5 in init_common_variables() /test/11.5_opt_san/sql/mysqld.cc:4145:7

    #9 0x5607729160cd in mysqld_main(int, char**) /test/11.5_opt_san/sql/mysqld.cc:5747:7

    #10 0x14bbe48280cf in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16

    #11 0x14bbe4828188 in __libc_start_main csu/../csu/libc-start.c:360:3

    #12 0x560772833a74 in _start (/test/UBASAN_MD170524-mariadb-11.5.0-linux-x86_64-opt/bin/mariadbd+0x1eeaa74) (BuildId: 625cf9b723786356a41e5db3b224cfc14cafba37)

SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /test/11.5_opt_san/strings/ctype-utf8.c:547:21 in 

$ cat BUILD_CMD_CMAKE 

cmake . -DCMAKE_C_COMPILER=/usr/bin/clang -DCMAKE_CXX_COMPILER=/usr/bin/clang++ -DWITH_SSL=bundled -DBUILD_CONFIG=mysql_release -DWITH_TOKUDB=0 -DWITH_JEMALLOC=no -DFEATURE_SET=community -DDEBUG_EXTNAME=OFF -DWITH_EMBEDDED_SERVER=0 -DENABLE_DOWNLOADS=1 -DDOWNLOAD_BOOST=1 -DWITH_BOOST=/tmp/boost_902208 -DENABLED_LOCAL_INFILE=1 -DENABLE_DTRACE=0 -DWITH_SAFEMALLOC=OFF -DPLUGIN_PERFSCHEMA=NO -DWITH_DBUG_TRACE=OFF -DWITH_ZLIB=bundled -DWITH_ROCKSDB=1 -DWITH_PAM=ON -DWITH_MARIABACKUP=0 -DFORCE_INSOURCE_BUILD=1 -DWITH_ASAN=ON -DWITH_ASAN_SCOPE=ON -DWITH_UBSAN=ON -DWSREP_LIB_WITH_ASAN=ON -DCMAKE_CXX_FLAGS=-fsanitize-coverage=trace-pc-guard -DMYSQL_MAINTAINER_MODE=OFF -DWARNING_AS_ERROR='' -DCMAKE_BUILD_TYPE=RelWithDebInfo

export UBSAN_OPTIONS=print_stacktrace=1