diff --git a/mysql-test/r/dyncol.result b/mysql-test/r/dyncol.result
index dfbb7a670d6..7a5eeac67cc 100644
--- a/mysql-test/r/dyncol.result
+++ b/mysql-test/r/dyncol.result
@@ -1883,6 +1883,16 @@ SELECT COLUMN_JSON(COLUMN_CREATE('test','First line\nSecond line')) AS json;
 json
 {"test":"First line\u000ASecond line"}
 #
+# MDEV-15230: column_json breaks cyrillic in 10.1.31
+#
+set names utf8;
+create table t1 (b blob);
+insert into t1 values (column_create('description',column_create('title','Описание')));
+select column_json(b) from t1;
+column_json(b)
+{"description":{"title":"Описание"}}
+drop table t1;
+#
 # end of 10.0 tests
 #
 #
diff --git a/mysql-test/suite/innodb/r/mvcc.result b/mysql-test/suite/innodb/r/mvcc.result
new file mode 100644
index 00000000000..6826978d6a7
--- /dev/null
+++ b/mysql-test/suite/innodb/r/mvcc.result
@@ -0,0 +1,31 @@
+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;
+connect  con1,localhost,root,,;
+ALTER TABLE t1 FORCE, ALGORITHM=COPY;
+connection default;
+SELECT * FROM t1;
+ERROR HY000: Table definition has changed, please retry transaction
+COMMIT;
+START TRANSACTION WITH CONSISTENT SNAPSHOT;
+connection con1;
+ALTER TABLE t1 DISCARD TABLESPACE;
+ALTER TABLE t1 IMPORT TABLESPACE;
+disconnect con1;
+connection default;
+# 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/r/recovery_shutdown.result b/mysql-test/suite/innodb/r/recovery_shutdown.result
index 7b6c9863b59..694fd4d9194 100644
--- a/mysql-test/suite/innodb/r/recovery_shutdown.result
+++ b/mysql-test/suite/innodb/r/recovery_shutdown.result
@@ -61,4 +61,5 @@ INSERT INTO t1(a) SELECT NULL FROM t1;
 connection default;
 SET GLOBAL innodb_flush_log_at_trx_commit=1;
 CREATE TABLE u(a SERIAL) ENGINE=INNODB;
+FLUSH TABLES;
 DROP TABLE t,u;
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;
diff --git a/mysql-test/suite/innodb/t/recovery_shutdown.test b/mysql-test/suite/innodb/t/recovery_shutdown.test
index fbe26368e1b..42d98ca34c7 100644
--- a/mysql-test/suite/innodb/t/recovery_shutdown.test
+++ b/mysql-test/suite/innodb/t/recovery_shutdown.test
@@ -41,6 +41,8 @@ INSERT INTO t1(a) SELECT NULL FROM t1;
 SET GLOBAL innodb_flush_log_at_trx_commit=1;
 CREATE TABLE u(a SERIAL) ENGINE=INNODB;
 
+FLUSH TABLES;
+
 --let $shutdown_timeout=0
 --source include/restart_mysqld.inc
 --let $shutdown_timeout=60
diff --git a/mysql-test/t/dyncol.test b/mysql-test/t/dyncol.test
index f695d97f9f6..f2c0a31c898 100644
--- a/mysql-test/t/dyncol.test
+++ b/mysql-test/t/dyncol.test
@@ -928,6 +928,15 @@ SELECT COLUMN_JSON(COLUMN_CREATE('a',1 AS DECIMAL,'b',1 AS DECIMAL));
 SELECT COLUMN_JSON(COLUMN_CREATE('test','"\\\t\n\Z')) AS json;
 SELECT COLUMN_JSON(COLUMN_CREATE('test','First line\nSecond line')) AS json;
 
+--echo #
+--echo # MDEV-15230: column_json breaks cyrillic in 10.1.31
+--echo #
+set names utf8;
+create table t1 (b blob);
+insert into t1 values (column_create('description',column_create('title','Описание')));
+select column_json(b) from t1;
+drop table t1;
+
 --echo #
 --echo # end of 10.0 tests
 --echo #
diff --git a/mysys/ma_dyncol.c b/mysys/ma_dyncol.c
index 2e00ca72f74..fb163899a76 100644
--- a/mysys/ma_dyncol.c
+++ b/mysys/ma_dyncol.c
@@ -3833,7 +3833,7 @@ my_bool dynstr_append_json_quoted(DYNAMIC_STRING *str,
   for (i= 0; i < len; i++)
   {
     register char c= append[i];
-    if (unlikely(c <= 0x1F))
+    if (unlikely(((uchar)c) <= 0x1F))
     {
       if (lim < 5)
         {
diff --git a/storage/innobase/include/row0upd.h b/storage/innobase/include/row0upd.h
index a174fd03751..77708d7d568 100644
--- a/storage/innobase/include/row0upd.h
+++ b/storage/innobase/include/row0upd.h
@@ -1,6 +1,7 @@
 /*****************************************************************************
 
 Copyright (c) 1996, 2016, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 2018, MariaDB Corporation.
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -126,8 +127,7 @@ row_upd_rec_sys_fields(
 	dict_index_t*	index,	/*!< in: clustered index */
 	const ulint*	offsets,/*!< in: rec_get_offsets(rec, index) */
 	const trx_t*	trx,	/*!< in: transaction */
-	roll_ptr_t	roll_ptr);/*!< in: roll ptr of the undo log record,
-				  can be 0 during IMPORT */
+	roll_ptr_t	roll_ptr);/*!< in: DB_ROLL_PTR to the undo log */
 /*********************************************************************//**
 Sets the trx id or roll ptr field of a clustered index entry. */
 void
diff --git a/storage/innobase/include/row0upd.ic b/storage/innobase/include/row0upd.ic
index 11271d6e9af..364c876ecc7 100644
--- a/storage/innobase/include/row0upd.ic
+++ b/storage/innobase/include/row0upd.ic
@@ -1,7 +1,7 @@
 /*****************************************************************************
 
 Copyright (c) 1996, 2015, Oracle and/or its affiliates. All Rights Reserved.
-Copyright (c) 2017, MariaDB Corporation.
+Copyright (c) 2017, 2018, MariaDB Corporation.
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -165,8 +165,7 @@ row_upd_rec_sys_fields(
 	dict_index_t*	index,	/*!< in: clustered index */
 	const ulint*	offsets,/*!< in: rec_get_offsets(rec, index) */
 	const trx_t*	trx,	/*!< in: transaction */
-	roll_ptr_t	roll_ptr)/*!< in: roll ptr of the undo log record,
-				 can be 0 during IMPORT */
+	roll_ptr_t	roll_ptr)/*!< in: DB_ROLL_PTR to the undo log */
 {
 	ut_ad(dict_index_is_clust(index));
 	ut_ad(rec_offs_validate(rec, index, offsets));
diff --git a/storage/innobase/row/row0import.cc b/storage/innobase/row/row0import.cc
index 0e7d93d0f32..82e35472cb8 100644
--- a/storage/innobase/row/row0import.cc
+++ b/storage/innobase/row/row0import.cc
@@ -897,13 +897,11 @@ private:
 	@param index the index being converted
 	@param rec record to update
 	@param offsets column offsets for the record
-	@param deleted true if row is delete marked
 	@return DB_SUCCESS or error code. */
 	dberr_t	adjust_cluster_record(
 		const dict_index_t*	index,
 		rec_t*			rec,
-		const ulint*		offsets,
-		bool			deleted) UNIV_NOTHROW;
+		const ulint*		offsets) UNIV_NOTHROW;
 
 	/** Find an index with the matching id.
 	@return row_index_t* instance or 0 */
@@ -1675,14 +1673,12 @@ PageConverter::purge(const ulint* offsets) UNIV_NOTHROW
 /** Adjust the BLOB references and sys fields for the current record.
 @param rec record to update
 @param offsets column offsets for the record
-@param deleted true if row is delete marked
 @return DB_SUCCESS or error code. */
 dberr_t
 PageConverter::adjust_cluster_record(
 	const dict_index_t*	index,
 	rec_t*			rec,
-	const ulint*		offsets,
-	bool			deleted) UNIV_NOTHROW
+	const ulint*		offsets) UNIV_NOTHROW
 {
 	dberr_t	err;
 
@@ -1694,7 +1690,7 @@ PageConverter::adjust_cluster_record(
 
 		row_upd_rec_sys_fields(
 			rec, m_page_zip_ptr, m_cluster_index, m_offsets,
-			m_trx, 0);
+			m_trx, roll_ptr_t(1) << ROLL_PTR_INSERT_FLAG_POS);
 	}
 
 	return(err);
@@ -1737,8 +1733,7 @@ PageConverter::update_records(
 		if (clust_index) {
 
 			dberr_t err = adjust_cluster_record(
-				m_index->m_srv_index, rec, m_offsets,
-				deleted);
+				m_index->m_srv_index, rec, m_offsets);
 
 			if (err != DB_SUCCESS) {
 				return(err);
diff --git a/storage/xtradb/include/row0upd.h b/storage/xtradb/include/row0upd.h
index 4312fcf7339..9efaaa41cf0 100644
--- a/storage/xtradb/include/row0upd.h
+++ b/storage/xtradb/include/row0upd.h
@@ -1,6 +1,7 @@
 /*****************************************************************************
 
 Copyright (c) 1996, 2016, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 2018, MariaDB Corporation.
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -119,8 +120,7 @@ row_upd_rec_sys_fields(
 	dict_index_t*	index,	/*!< in: clustered index */
 	const ulint*	offsets,/*!< in: rec_get_offsets(rec, index) */
 	const trx_t*	trx,	/*!< in: transaction */
-	roll_ptr_t	roll_ptr);/*!< in: roll ptr of the undo log record,
-				  can be 0 during IMPORT */
+	roll_ptr_t	roll_ptr);/*!< in: DB_ROLL_PTR to the undo log */
 /*********************************************************************//**
 Sets the trx id or roll ptr field of a clustered index entry. */
 UNIV_INTERN
diff --git a/storage/xtradb/include/row0upd.ic b/storage/xtradb/include/row0upd.ic
index 618a77fa4bf..efc6c1be4b5 100644
--- a/storage/xtradb/include/row0upd.ic
+++ b/storage/xtradb/include/row0upd.ic
@@ -1,6 +1,7 @@
 /*****************************************************************************
 
 Copyright (c) 1996, 2012, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 2018, MariaDB Corporation.
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -153,8 +154,7 @@ row_upd_rec_sys_fields(
 	dict_index_t*	index,	/*!< in: clustered index */
 	const ulint*	offsets,/*!< in: rec_get_offsets(rec, index) */
 	const trx_t*	trx,	/*!< in: transaction */
-	roll_ptr_t	roll_ptr)/*!< in: roll ptr of the undo log record,
-				 can be 0 during IMPORT */
+	roll_ptr_t	roll_ptr)/*!< in: DB_ROLL_PTR to the undo log */
 {
 	ut_ad(dict_index_is_clust(index));
 	ut_ad(rec_offs_validate(rec, index, offsets));
diff --git a/storage/xtradb/row/row0import.cc b/storage/xtradb/row/row0import.cc
index 117e1fd2771..18939d4cab9 100644
--- a/storage/xtradb/row/row0import.cc
+++ b/storage/xtradb/row/row0import.cc
@@ -1770,7 +1770,7 @@ PageConverter::adjust_cluster_record(
 
 		row_upd_rec_sys_fields(
 			rec, m_page_zip_ptr, m_cluster_index, m_offsets,
-			m_trx, 0);
+			m_trx, roll_ptr_t(1) << 55);
 	}
 
 	return(err);