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MDEV-10793: MDEV-33292: main.kill_processlist-6619 fails sporadically in buildbot

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There were several races in the main.kill_processlist-6619 testcase:

 - Lingering connections from a previous test case could be visible in SHOW
   PROCESSLIST and cause .result diff.
 - A sync point "dispatch_command_end" was ineffective, as it was consumed at
   the end of the SET DEBUG command itself.
 - The signal from sync point "before_execute_sql_command" could override an
   earlier signal, causing DEBUG_SYNC timeout and test failure.
 - The final SHOW PROCESSLIST could occasionally see a connection in state
   "Busy" instead of the expected "Sleep".

Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>
This commit is contained in:
Kristian Nielsen
2024-03-14 22:48:12 +01:00
parent ae063e4ff5
commit ef7abc881c
3 changed files with 35 additions and 6 deletions
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sql/sql_parse.cc
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@ -2504,6 +2504,7 @@ dispatch_end:
MYSQL_COMMAND_DONE(res);
}
DEBUG_SYNC(thd,"dispatch_command_end");
DEBUG_SYNC(thd,"dispatch_command_end2");
/* Check that some variables are reset properly */
DBUG_ASSERT(thd->abort_on_warning == 0);