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Could be an issue in the optimizer or in PS. Reproduces on MyISAM also, though the traces seem to include InnoDB code (even when MyISAM is used). The amount of memory loss grows accross releases (for optimized builds, 10.3 and 10.4 have 80 bytes lost, 10.5 and 10.6 have 104 bytes lost, 10.7 and 10.8 have 16400 bytes lost and 10.9 to 10.11 have 16424 bytes lost. Debug builds have different numbers)
CREATE TABLE t (c1 INT,c2 INT) ENGINE=InnoDB;
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PREPARE s FROM 'WITH RECURSIVE d AS (SELECT * FROM t UNION ALL SELECT 1 FROM d) SELECT * FROM d AS e,d AS f';
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SHUTDOWN;
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Leads to:
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10.3.37 a1055ab35d29437b717e83b1a388eaa02901c42f (Optimized)
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2022-08-29 15:20:09 0 [Note] /test/MD200822-mariadb-10.3.37-linux-x86_64-opt/bin/mysqld: Shutdown complete
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Warning: Memory not freed: 80
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Same amount of memory (80 bytes) not freed on 10.4. However, on 10.5 we see:
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10.5.18 5fc172fd43375b392a8c8adfb9038c279e578d83 (Optimized)
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2022-08-29 15:25:00 0 [Note] /test/MD200822-mariadb-10.5.18-linux-x86_64-opt/bin/mysqld: Shutdown complete
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Warning: Memory not freed: 104
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10.5.18 5fc172fd43375b392a8c8adfb9038c279e578d83 (Debug)
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Version: '10.5.18-MariaDB-debug' socket: '/test/MD200822-mariadb-10.5.18-linux-x86_64-dbg/socket.sock' port: 10798 MariaDB Server
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2022-08-29 15:23:15 0 [Note] /test/MD200822-mariadb-10.5.18-linux-x86_64-dbg/bin/mysqld (initiated by: root[root] @ localhost []): Normal shutdown
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2022-08-29 15:23:15 0 [Note] Event Scheduler: Purging the queue. 0 events
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Warning: 1048 bytes lost at 0x564d8c330860, allocated by T@4 at 0x564d87ff4d8f, sql/sql_class.cc:891, handler/ha_innodb.cc:1473, fts/fts0opt.cc:2997, srv/srv0start.cc:1856, handler/ha_innodb.cc:4077, sql/handler.cc:645, sql/sql_plugin.cc:1461
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Warning: 280 bytes lost at 0x564d8c328410, allocated by T@4 at mysys/array.c:71, mysys/hash.c:102, sql/sql_class.cc:856, sql/sql_class.cc:4988, handler/ha_innodb.cc:1473, fts/fts0opt.cc:2997, srv/srv0start.cc:1856, handler/ha_innodb.cc:4077
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Warning: 280 bytes lost at 0x564d8c328270, allocated by T@4 at mysys/array.c:71, mysys/hash.c:102, sql/sql_class.cc:853, sql/sql_class.cc:4988, handler/ha_innodb.cc:1473, fts/fts0opt.cc:2997, srv/srv0start.cc:1856, handler/ha_innodb.cc:4077
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Warning: 120 bytes lost at 0x564d8c2f7f80, allocated by T@4 at mysys/my_malloc.c:233, sql/session_tracker.cc:335, sql/sql_plugin.cc:3256, sql/sql_class.cc:1245, sql/sql_class.cc:848, sql/sql_class.cc:4988, handler/ha_innodb.cc:1473, fts/fts0opt.cc:2997
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Warning: 1072 bytes lost at 0x564d8c327ba0, allocated by T@4 at mysys/my_alloc.c:80, sql/thr_malloc.cc:65, sql/sql_error.cc:523, sql/sql_class.cc:740, sql/sql_class.cc:4988, handler/ha_innodb.cc:1473, fts/fts0opt.cc:2997, srv/srv0start.cc:1856
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Memory lost: 2800 bytes in 1016 chunks
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mysqld: /test/10.5_dbg/sql/sql_class.cc:1744: virtual THD::~THD(): Assertion `status_var.local_memory_used == 0 || !debug_assert_on_not_freed_memory' failed.
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Same amount of memory (104 bytes) not freed on 10.6. However, on 10.7 we see:
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10.7.6 dc11fd07fdaf7316d340569f97a84fa0fd2d307e (Optimized)
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2022-08-29 15:27:11 0 [Note] /test/MD200822-mariadb-10.7.6-linux-x86_64-opt/bin/mysqld: Shutdown complete
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Warning: Memory not freed: 16400
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10.7.6 dc11fd07fdaf7316d340569f97a84fa0fd2d307e (Debug)
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2022-08-29 15:28:48 0 [Note] /test/MD200822-mariadb-10.7.6-linux-x86_64-dbg/bin/mysqld (initiated by: root[root] @ localhost []): Normal shutdown
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Warning: 1048 bytes lost at 0x5562dc09cac0, allocated by T@4 at 0x5562d93f14b8, sql/sql_class.cc:895, handler/ha_innodb.cc:1816, fts/fts0opt.cc:2923, srv/srv0start.cc:1833, handler/ha_innodb.cc:4302, sql/handler.cc:649, sql/sql_plugin.cc:1464
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Warning: 280 bytes lost at 0x5562dc09c920, allocated by T@4 at mysys/array.c:72, mysys/hash.c:102, sql/sql_class.cc:860, sql/sql_class.cc:4966, handler/ha_innodb.cc:1816, fts/fts0opt.cc:2923, srv/srv0start.cc:1833, handler/ha_innodb.cc:4302
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Warning: 280 bytes lost at 0x5562dc09c780, allocated by T@4 at mysys/array.c:72, mysys/hash.c:102, sql/sql_class.cc:857, sql/sql_class.cc:4966, handler/ha_innodb.cc:1816, fts/fts0opt.cc:2923, srv/srv0start.cc:1833, handler/ha_innodb.cc:4302
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Warning: 120 bytes lost at 0x5562dc0a4b90, allocated by T@4 at mysys/my_malloc.c:233, sql/session_tracker.cc:335, sql/sql_plugin.cc:3260, sql/sql_class.cc:1237, sql/sql_class.cc:852, sql/sql_class.cc:4966, handler/ha_innodb.cc:1816, fts/fts0opt.cc:2923
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Memory lost: 1728 bytes in 1563 chunks
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mysqld: /test/10.7_dbg/sql/sql_class.cc:1733: virtual THD::~THD(): Assertion `status_var.local_memory_used == 0 || !debug_assert_on_not_freed_memory' failed.
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Same amount of memory (16400 bytes) not freed on 10.8. However, on 10.9 to 10.11 we see:
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10.9.2 8cb75b9863a7043ebf2545158b3d2e634bca1831 (Optimized)
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2022-08-29 15:29:51 0 [Note] /test/MD200822-mariadb-10.9.2-linux-x86_64-opt/bin/mysqld: Shutdown complete
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Warning: Memory not freed: 16424
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10.11.0 bc563f1a4b0b38de3b41fd0f0d3d8b7f1aacbd8b (Optimized)
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2022-08-29 15:15:27 0 [Note] /test/MD190822-mariadb-10.11.0-linux-x86_64-opt/bin/mysqld: Shutdown complete
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Warning: Memory not freed: 16424
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10.11.0 bc563f1a4b0b38de3b41fd0f0d3d8b7f1aacbd8b (Debug)
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2022-08-29 15:15:05 0 [Note] /test/MD190822-mariadb-10.11.0-linux-x86_64-dbg/bin/mysqld (initiated by: root[root] @ localhost []): Normal shutdown
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Warning: 1048 bytes lost at 0x55ffcc0fe660, allocated by T@4 at 0x55ffc9f6d5de, sql/sql_class.cc:893, handler/ha_innodb.cc:1752, fts/fts0opt.cc:2923, srv/srv0start.cc:1543, handler/ha_innodb.cc:4233, sql/handler.cc:649, sql/sql_plugin.cc:1464
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Warning: 280 bytes lost at 0x55ffcc0fe4c0, allocated by T@4 at mysys/array.c:72, mysys/hash.c:102, sql/sql_class.cc:858, sql/sql_class.cc:4965, handler/ha_innodb.cc:1752, fts/fts0opt.cc:2923, srv/srv0start.cc:1543, handler/ha_innodb.cc:4233
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Warning: 280 bytes lost at 0x55ffcc0fe320, allocated by T@4 at mysys/array.c:72, mysys/hash.c:102, sql/sql_class.cc:855, sql/sql_class.cc:4965, handler/ha_innodb.cc:1752, fts/fts0opt.cc:2923, srv/srv0start.cc:1543, handler/ha_innodb.cc:4233
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Warning: 120 bytes lost at 0x55ffcc106730, allocated by T@4 at mysys/my_malloc.c:233, sql/session_tracker.cc:335, sql/sql_plugin.cc:3260, sql/sql_class.cc:1235, sql/sql_class.cc:850, sql/sql_class.cc:4965, handler/ha_innodb.cc:1752, fts/fts0opt.cc:2923
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Memory lost: 1728 bytes in 1553 chunks
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mysqld: /test/10.11_dbg/sql/sql_class.cc:1731: virtual THD::~THD(): Assertion `status_var.local_memory_used == 0 || !debug_assert_on_not_freed_memory' failed.
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Bug confirmed present in:
MariaDB: 10.3.37 (dbg), 10.3.37 (opt), 10.4.27 (dbg), 10.4.27 (opt), 10.5.18 (dbg), 10.5.18 (opt), 10.6.10 (dbg), 10.6.10 (opt), 10.7.6 (dbg), 10.7.6 (opt), 10.8.5 (dbg), 10.8.5 (opt), 10.9.2 (dbg), 10.9.2 (opt), 10.10.2 (dbg), 10.10.2 (opt), 10.11.0 (dbg), 10.11.0 (opt)
Bug (or feature/syntax) confirmed not present in:
MySQL: 5.5.62 (dbg), 5.5.62 (opt), 5.6.51 (dbg), 5.6.51 (opt), 5.7.38 (dbg), 5.7.38 (opt), 8.0.29 (dbg), 8.0.29 (opt)
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