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  1. MariaDB Server
  2. MDEV-22263

main.func_debug fails on a valgrind build with wrong result

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    Description

      The failure below only happens for me on a Valgrind build (-DCMAKE_BUILD_TYPE=Debug -DWITH_VALGRIND=YES), not on a plain debug or ASAN builds.
      On a Valgrind build, it currently happens deterministically, at least on two different machines with different gcc versions.
      The test doesn't have to be run with --valgrind, it happens with and without the option alike; it's only the build that matters.

      10.3 6577a7a8 Valgrind

      		 
      $ perl ./mtr main.func_debug --valgrind
      		 
       
      		 
      main.func_debug                          [ fail ]
      		 
              Test ended at 2020-04-16 21:47:01
      		 
       
      		 
      CURRENT_TEST: main.func_debug
      		 
      --- /data/bld/10.3-valgrind-nightly/mysql-test/main/func_debug.result	2020-04-16 06:58:36.000000000 +0300
      		 
      +++ /data/bld/10.3-valgrind-nightly/mysql-test/main/func_debug.reject	2020-04-16 21:47:01.119451507 +0300
      		 
      @@ -1671,6 +1671,6 @@
      		 
       2
      		 
       9
      		 
       Warnings:
      		 
      -Note	1105	DBUG: Item_subselect::exec (select max(`test`.`t1`.`a`) from `test`.`t...
      		 
      +Note	1105	DBUG: Item_subselect::exec (select max(`test`.`t1`.`a`) from `test`.`t1`)
      		 
       DROP TABLE t1;
      		 
       SET SESSION debug_dbug="-d,Item_subselect";
      		 
       
      		 
      mysqltest: Result content mismatch

      Reproducible on 10.3 and on 10.4 after the recent merge, so it must have been introduced recently. I didn't bisect for the exact commit.
      10.2 doesn't have the test.

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            anel Anel Husakovic
            elenst Elena Stepanova
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