There are two failure-prone pattern in mtr suite tests that allows for a pre-test
global.debug_dbug value to not be actually restored, though the test intends doing so.
1. Total reset of @@global.debug_dbug at the end of the test, like in
rpl.kill_race_condition leads to a mtr report like
*--- /home2/me/MDB/WTs/10.5/sandbox/RUN_DEBUG/mysql-test/var/tmp/check-mysqld_2.result 2019-12-19 16:25:40.952378912 +0200
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+++ /home2/me/MDB/WTs/10.5/sandbox/RUN_DEBUG/mysql-test/var/tmp/check-mysqld_2.reject 2019-12-19 16:25:42.168365805 +0200
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@@ -124,9 +124,9 @@
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DEADLOCK_SEARCH_DEPTH_SHORT 4
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DEADLOCK_TIMEOUT_LONG 50000000
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DEADLOCK_TIMEOUT_SHORT 10000
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-DEBUG d,ib_log_checkpoint_avoid
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+DEBUG
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DEBUG_BINLOG_FSYNC_SLEEP 0
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-DEBUG_DBUG d,ib_log_checkpoint_avoid
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+DEBUG_DBUG
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DEBUG_MUTEX_DEADLOCK_DETECTOR ON
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DEBUG_NO_THREAD_ALARM OFF
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DEFAULT_PASSWORD_LIFETIME 0
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mysqltest: Result length mismatch
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not ok
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rpl.kill_race_condition 'row' [ pass ] 787
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MTR's internal check of the test case 'rpl.kill_race_condition' failed.
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This means that the test case does not preserve the state that existed
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before the test case was executed. Most likely the test case did not
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do a proper clean-up. It could also be caused by the previous test run
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by this thread, if the server wasn't restarted.
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no* further _formatting_ is done here
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when run with a pre-installed debug_dbug: ./mtr --mysqld = --debug=d,....
2. reset to a "$saved" mtr variable that expands at the assignment
mysql-test/suite/rpl/t/rpl_slave_load_remove_tmpfile.test:77:eval SET @@global.debug_dbug= '$old_debug';
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to a string whose value is actually variable
e.g 'cos of the pre-installation pattern of p.1.
Resetting should be done either via save/restore through a session @var, see
mysql-test/suite/versioning/t/debug.test:34:set global debug_dbug=@old_dbug;
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or instead of the memorization pattern a +/-d,keyword increment and decrement style should be used.
For using the latter without threatening to polute the server error log though we lack
`commit 0b9400d1f54f4ae9b84decf53352850171880f1e
19:47:52 Author: Thayumanavar <thayumanavar.x.sachithanantha@oracle.com
(thayumanavar.x.sachithanantha@oracle.com)>
19:47:52 Date: Thu May 2 16:22:57 2013 +0530