@i.Tuzhilkin ,

You seem to be using 5.6.15-25.3, can you test with 5.6.15-25.4 which was released today? (which has "Server version:         5.6.15-63.0-log Percona XtraDB Cluster (GPL), Release 25.4, wsrep_25.4.r4043")

Also,


Please provide cnf as well as error log (and general log if any). 

In addition:

a) Can you provide structure of the table before the crash?

b) Also, if you have test data that can be loaded, please provide that 

I tested with sbtest and it didn't crash:

====================
MySQL [sbtest]> show create table sbtest1;
+---------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table   | Create Table                                                                                                                                                                                                                                                                                                          |
+---------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| sbtest1 | CREATE TABLE `sbtest1` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `k` int(10) unsigned NOT NULL DEFAULT '0',
  `c` char(120) NOT NULL DEFAULT '',
  `pad` char(60) NOT NULL DEFAULT '',
  PRIMARY KEY (`id`),
  KEY `k_1` (`k`)
) ENGINE=InnoDB AUTO_INCREMENT=100001 DEFAULT CHARSET=utf8 MAX_ROWS=1000000 |
+---------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

MySQL [sbtest]> alter table sbtest1 change c c varchar(200) NULL;
Query OK, 100000 rows affected (2.79 sec)
Records: 100000  Duplicates: 0  Warnings: 0

MySQL [sbtest]> show create table sbtest1;
+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table   | Create Table                                                                                                                                                                                                                                                                                                      |
+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| sbtest1 | CREATE TABLE `sbtest1` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `k` int(10) unsigned NOT NULL DEFAULT '0',
  `c` varchar(200) DEFAULT NULL,
  `pad` char(60) NOT NULL DEFAULT '',
  PRIMARY KEY (`id`),
  KEY `k_1` (`k`)
) ENGINE=InnoDB AUTO_INCREMENT=100001 DEFAULT CHARSET=utf8 MAX_ROWS=1000000 |
+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

MySQL [sbtest]> alter table sbtest1 change c c varchar(300) NULL;
Query OK, 100000 rows affected (2.62 sec)
Records: 100000  Duplicates: 0  Warnings: 0

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