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MemorySanitizer (see MDEV-20377 how to use it) revealed a use of an uninitialized value in the test main.query_cache_innodb:
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10.5 53aabda6b5ac6af989a97a00ff97efda9ff8772e
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CURRENT_TEST: main.query_cache_innodb
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mysqltest: At line 43: query 'select * from `t2$ї`' failed: 2013: Lost connection to MySQL server during query
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…
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Version: '10.5.3-MariaDB-debug-log' socket: '/dev/shm/10.5ms/mysql-test/var/tmp/11/mysqld.1.sock' port: 16200 Source distribution
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Uninitialized bytes in MemcmpInterceptorCommon at offset 14 inside [0x7fbbb6ff0f00, 17)
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==2528976==WARNING: MemorySanitizer: use-of-uninitialized-value
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#0 0x5608be9a9adc in bcmp (/dev/shm/10.5ms/sql/mariadbd+0x6deadc)
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#1 0x5608c18e5d0b in dict_table_t* dict_acquire_mdl_shared<false>(dict_table_t*, THD*,MDL_ticket**, dict_table_op_t) /mariadb/10.5m/storage/innobase/dict/dict0dict.cc:892:10
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#2 0x5608c1892a20 in dict_table_open_on_id(unsigned long, bool, dict_table_op_t, THD*, MDL_ticket**) /mariadb/10.5m/storage/innobase/dict/dict0dict.cc:947:12
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#3 0x5608c129fdeb in row_purge_parse_undo_rec(purge_node_t*, unsigned char*, que_thr_t*, bool*) /mariadb/10.5m/storage/innobase/row/row0purge.cc:933:16
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#4 0x5608c129fdeb in row_purge(purge_node_t*, unsigned char*, que_thr_t*) /mariadb/10.5m/storage/innobase/row/row0purge.cc:1107:10
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#5 0x5608c129fdeb in row_purge_step(que_thr_t*) /mariadb/10.5m/storage/innobase/row/row0purge.cc:1159:3
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…
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Uninitialized value was created by an allocation of 'db_buf' in the stack frame of function '_Z23dict_acquire_mdl_sharedILb0EEP12dict_table_tS1_P3THDPP10MDL_ticket15dict_table_op_t'
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#0 0x5608c18e4de0 in dict_table_t* dict_acquire_mdl_shared<false>(dict_table_t*, THD*, MDL_ticket**, dict_table_op_t) /mariadb/10.5m/storage/innobase/dict/dict0dict.cc:790
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Only 16 bytes of the db_buf are initialized, but we are comparing 20 of them. The reason is that the name shrunk in dict_table_t::parse_name(), but the length was not adjusted accordingly. Something similar was fixed in MDEV-21344, but only for the table name.
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