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MDEV-17896 Assertion `pfs->get_refcount() > 0' failed

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Unfortunate DROP TEMPORARY..IF EXISTS on a regular table may allow
subsequent CREATE TABLE statements to steal away the PFS_table_share
instance from the dropped table.
This commit is contained in:
Robert Bindar
2019-10-10 12:58:29 +03:00
parent d925aec1c1
commit 6f86150ab3
3 changed files with 71 additions and 0 deletions
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16
mysql-test/suite/perfschema/r/misc.result
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@ -134,3 +134,19 @@ truncate performance_schema.events_statements_history 0
select * from t1 3
insert into t1 select RAND()*10000 from t1 6
drop table t1;
#
# MDEV-17896 Assertion `pfs->get_refcount() > 0' failed
# in release_table_share
#
SELECT COUNT(*)<@@performance_schema_max_table_instances FROM
performance_schema.objects_summary_global_by_type WHERE OBJECT_TYPE='TABLE';
COUNT(*)<@@performance_schema_max_table_instances
1
CREATE TABLE t0(a INT);
SELECT * FROM t0;
a
DROP TEMPORARY TABLE IF EXISTS t0;
Warnings:
Note 1051 Unknown table 'test.t0'
FLUSH TABLE t0;
DROP TABLE t0;