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Record BACKUP and SCHEMA namespaces order

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This commit is contained in:
Sergey Vojtovich
2019-06-06 14:41:45 +04:00
parent 965db355e6
commit 6999da9b19
2 changed files with 63 additions and 0 deletions
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25
mysql-test/main/backup_lock_debug.result
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@ -26,3 +26,28 @@ disconnect con1;
connection default;
DROP TABLE t1;
SET DEBUG_SYNC= 'RESET';
#
# Demonstrates a deadlock if BACKUP namespace is reorder after SCHEMA.
# Culprit is ALTER TABLE taking SCHEMA lock on target database after
# BACKUP lock was acquired.
#
CREATE DATABASE test2;
CREATE TABLE t1(a INT) ENGINE=InnoDB;
SET DEBUG_SYNC='alter_opened_table SIGNAL ready WAIT_FOR go';
ALTER TABLE t1 RENAME TO test2.t1;
connect con1,localhost,root,,;
SET DEBUG_SYNC='now WAIT_FOR ready';
BACKUP STAGE START;
SET DEBUG_SYNC='mdl_acquire_lock_wait SIGNAL ready1';
BACKUP STAGE BLOCK_DDL;
connect con2,localhost,root,,;
SET DEBUG_SYNC='now WAIT_FOR ready1';
SET DEBUG_SYNC='mdl_acquire_lock_wait SIGNAL go';
DROP DATABASE test2;
connection default;
connection con1;
disconnect con1;
connection con2;
disconnect con2;
connection default;
SET DEBUG_SYNC='reset';