MDEV-15249 Crash in MVCC read after IMPORT TABLESPACE

PageConverter::adjust_cluster_record(): Instead of writing
the invalid value DB_ROLL_PTR=0, write a value that indicates
a fresh insert, that is, prevents the DB_ROLL_PTR from being
dereferenced in any circumstances.

It can be argued that IMPORT TABLESPACE should actually
update the dict_index_t::trx_id to prevent older transactions
from accessing the table, similar to what I did on table
rebuild in MySQL 5.6.6 in
https://github.com/mysql/mysql-server/commit/03f81a55f221095d397c375afe8a10c8038da339

2 files changed, 78 insertions, 0 deletions

diff --git a/mysql-test/suite/innodb/r/mvcc.result b/mysql-test/suite/innodb/r/mvcc.result
new file mode 100644
index 00000000000..6bbabc8d87a
--- /dev/null
+++ b/mysql-test/suite/innodb/r/mvcc.result
@@ -0,0 +1,26 @@
+SET @save_per_table= @@GLOBAL.innodb_file_per_table;
+SET GLOBAL innodb_file_per_table= 1;
+#
+# MDEV-15249 Crash in MVCC read after IMPORT TABLESPACE
+#
+CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=InnoDB;
+INSERT INTO t1 VALUES(0);
+FLUSH TABLES t1 WITH READ LOCK;
+UNLOCK TABLES;
+START TRANSACTION WITH CONSISTENT SNAPSHOT;
+ALTER TABLE t1 FORCE, ALGORITHM=COPY;
+SELECT * FROM t1;
+ERROR HY000: Table definition has changed, please retry transaction
+COMMIT;
+START TRANSACTION WITH CONSISTENT SNAPSHOT;
+ALTER TABLE t1 DISCARD TABLESPACE;
+ALTER TABLE t1 IMPORT TABLESPACE;
+# FIXME: Block this with ER_TABLE_DEF_CHANGED
+SELECT * FROM t1;
+a
+COMMIT;
+SELECT * FROM t1;
+a
+0
+DROP TABLE t1;
+SET GLOBAL innodb_file_per_table= @save_per_table;
diff --git a/mysql-test/suite/innodb/t/mvcc.test b/mysql-test/suite/innodb/t/mvcc.test
new file mode 100644
index 00000000000..bf76a5de798
--- /dev/null
+++ b/mysql-test/suite/innodb/t/mvcc.test
@@ -0,0 +1,52 @@
+--source include/have_innodb.inc
+
+SET @save_per_table= @@GLOBAL.innodb_file_per_table;
+SET GLOBAL innodb_file_per_table= 1;
+
+let MYSQLD_DATADIR =`SELECT @@datadir`;
+
+--echo #
+--echo # MDEV-15249 Crash in MVCC read after IMPORT TABLESPACE
+--echo #
+
+CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=InnoDB;
+INSERT INTO t1 VALUES(0);
+FLUSH TABLES t1 WITH READ LOCK;
+perl;
+do "$ENV{MTR_SUITE_DIR}/include/innodb-util.pl";
+ib_backup_tablespace("test", "t1");
+EOF
+UNLOCK TABLES;
+
+START TRANSACTION WITH CONSISTENT SNAPSHOT;
+
+connect (con1,localhost,root,,);
+ALTER TABLE t1 FORCE, ALGORITHM=COPY;
+
+connection default;
+--error ER_TABLE_DEF_CHANGED
+SELECT * FROM t1;
+COMMIT;
+START TRANSACTION WITH CONSISTENT SNAPSHOT;
+
+connection con1;
+
+ALTER TABLE t1 DISCARD TABLESPACE;
+
+perl;
+do "$ENV{MTR_SUITE_DIR}/include/innodb-util.pl";
+ib_restore_tablespace("test", "t1");
+EOF
+
+ALTER TABLE t1 IMPORT TABLESPACE;
+disconnect con1;
+
+connection default;
+--echo # FIXME: Block this with ER_TABLE_DEF_CHANGED
+SELECT * FROM t1;
+COMMIT;
+SELECT * FROM t1;
+
+DROP TABLE t1;
+
+SET GLOBAL innodb_file_per_table= @save_per_table;