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  1. MariaDB Server
  2. MDEV-26761

main.mysql_client_test test_mdev19838 fails with MemorySanitizer

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      This came up while I was working on MDEV-26758. These tests used to fail with MemorySanitizer:

      main.mysql_client_test_comp              w3 [ pass ]  43767
      main.mysql_client_test_nonblock          w2 [ pass ]  44749
      main.mysql_client_test                   w1 [ pass ]  44743
      

      I suspect that fixing test_mdev19838() requires some changes in libmariadb itself. I am getting the following trace:

      ==WARNING: MemorySanitizer: use-of-uninitialized-value
          #0 0x55f050b09636 in madb_reset_stmt /mariadb/10.5m/libmariadb/libmariadb/mariadb_stmt.c:2159:15
          #1 0x55f050b04e7e in mysql_stmt_internal_reset /mariadb/10.5m/libmariadb/libmariadb/mariadb_stmt.c:2186:8
          #2 0x55f050b075e3 in mysql_stmt_close /mariadb/10.5m/libmariadb/libmariadb/mariadb_stmt.c:1400:7
          #3 0x55f050ac9524 in wrap_mysql_stmt_close /mariadb/10.5m/tests/nonblock-wrappers.h:369:1
          #4 0x55f050ac9524 in test_mdev19838 /mariadb/10.5m/tests/mysql_client_test.c:21259:5
          #5 0x55f05085e978 in main /mariadb/10.5m/tests/mysql_client_fw.c:1449:9
          #6 0x7f04193f1e49 in __libc_start_main csu/../csu/libc-start.c:314:16
          #7 0x55f0507d5869 in _start (/dev/shm/10.5msan/tests/mariadb-client-test+0x5b869)
       
        Uninitialized value was created by a heap allocation
          #0 0x55f0507e1cad in malloc (/dev/shm/10.5msan/tests/mariadb-client-test+0x67cad)
          #1 0x55f050af8a0c in ma_init_alloc_root /mariadb/10.5m/libmariadb/libmariadb/ma_alloc.c:36:18
      

      For now, I will disable test_mdev19838() under MemorySanitizer. It was already disabled for the embedded server.

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              Assignee:
              georg Georg Richter
              Reporter:
              marko Marko Mäkelä
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