Thread 1 (LWP 26471):
+bt
#0  0x0000003fde20c69c in pthread_kill () from /lib64/libpthread.so.0
#1  0x000000000068302e in handle_fatal_signal (sig=6) at /bzr/5.6_dbg/Percona-Server-5.6.11-rc60.3/sql/signal_handler.cc:251
#2  <signal handler called>
#3  0x0000003fdde328a5 in raise () from /lib64/libc.so.6
#4  0x0000003fdde34085 in abort () from /lib64/libc.so.6
#5  0x0000003fdde2ba1e in __assert_fail_base () from /lib64/libc.so.6
#6  0x0000003fdde2bae0 in __assert_fail () from /lib64/libc.so.6
#7  0x0000000000812f91 in Field_long::val_int (this=0x7f8f6807f140) at /bzr/5.6_dbg/Percona-Server-5.6.11-rc60.3/sql/field.cc:3822
#8  0x00000000009ea3fc in ha_innobase::write_row (this=0x7f8f6807d390, record=<optimized out>) at /bzr/5.6_dbg/Percona-Server-5.6.11-rc60.3/storage/innobase/handler/ha_innodb.cc:6957
#9  0x00000000005b7b9f in handler::ha_write_row (this=0x7f8f6807d390, buf=0x7f8f6806eee8 "") at /bzr/5.6_dbg/Percona-Server-5.6.11-rc60.3/sql/handler.cc:7414
#10 0x0000000000c4a3e9 in ha_partition::write_row (this=0x7f8f6807cd20, buf=0x7f8f6806eee8 "") at /bzr/5.6_dbg/Percona-Server-5.6.11-rc60.3/sql/ha_partition.cc:3927
#11 0x00000000005b7b9f in handler::ha_write_row (this=0x7f8f6807cd20, buf=0x7f8f6806eee8 "") at /bzr/5.6_dbg/Percona-Server-5.6.11-rc60.3/sql/handler.cc:7414
#12 0x000000000076883b in copy_data_between_tables (from=0x7f8f680412b0, to=0x7f8f680776d0, create=..., ignore=false, order_num=0, order=0x7f8ffc35ce30, copied=0x7f8ffc35ea28, deleted=0x7f8ffc35ea20, keys_onoff=Alter_info::LEAVE_AS_IS, alter_ctx=0x7f8ffc35d040) at /bzr/5.6_dbg/Percona-Server-5.6.11-rc60.3/sql/sql_table.cc:8974
#13 0x0000000000775732 in mysql_alter_table (thd=<optimized out>, new_db=0x7f8ffc35e810 "\340\260L\001", new_name=0x7f8f680776d0 "\250\177\ah\217\177", create_info=<optimized out>, table_list=0x7f8f68004e90, alter_info=0x7f8ffc35eb90, order_num=0, order=0x0, ignore=false) at /bzr/5.6_dbg/Percona-Server-5.6.11-rc60.3/sql/sql_table.cc:8502
#14 0x0000000000776642 in mysql_recreate_table (thd=0x3a2bbb0, table_list=0x7f8f68004e90) at /bzr/5.6_dbg/Percona-Server-5.6.11-rc60.3/sql/sql_table.cc:9093
#15 0x000000000087f1a1 in mysql_admin_table(THD *, TABLE_LIST *, HA_CHECK_OPT *, const char *, thr_lock_type, bool, bool, uint, int (*)(THD *, TABLE_LIST *, HA_CHECK_OPT *), struct {...}, int (*)(THD *, TABLE_LIST *)) (thd=0x3a2bbb0, tables=0x7f8ffc35f170, check_opt=0x3a2ed08, operator_name=0xd5ea14 "optimize", lock_type=TL_WRITE, open_for_modify=false, repair_table_use_frm=false, extra_open_options=0, prepare_func=0x0, operator_func=(int (handler::*)(handler * const, THD *, HA_CHECK_OPT *)) 0x5bde30 <handler::ha_optimize(THD*, st_ha_check_opt*)>, view_operator_func=0x0) at /bzr/5.6_dbg/Percona-Server-5.6.11-rc60.3/sql/sql_admin.cc:783
#16 0x000000000087f82a in Sql_cmd_optimize_table::execute (this=<optimized out>, thd=0x3a2bbb0) at /bzr/5.6_dbg/Percona-Server-5.6.11-rc60.3/sql/sql_admin.cc:1097
#17 0x00000000007152e6 in mysql_execute_command (thd=0x3a2bbb0) at /bzr/5.6_dbg/Percona-Server-5.6.11-rc60.3/sql/sql_parse.cc:5132
#18 0x000000000071b8b8 in mysql_parse (thd=0x3a2bbb0, rawbuf=0x3a2df68 "p\234\065\001", length=<optimized out>, parser_state=<optimized out>) at /bzr/5.6_dbg/Percona-Server-5.6.11-rc60.3/sql/sql_parse.cc:6451
#19 0x000000000071c923 in dispatch_command (command=COM_QUERY, thd=0x3a2bbb0, packet=0x3a2f511 "", packet_length=73) at /bzr/5.6_dbg/Percona-Server-5.6.11-rc60.3/sql/sql_parse.cc:1376
#20 0x000000000071d86b in do_command (thd=0x3a2bbb0) at /bzr/5.6_dbg/Percona-Server-5.6.11-rc60.3/sql/sql_parse.cc:1051
#21 0x00000000006e261f in do_handle_one_connection (thd_arg=<optimized out>) at /bzr/5.6_dbg/Percona-Server-5.6.11-rc60.3/sql/sql_connect.cc:1615
#22 0x00000000006e2707 in handle_one_connection (arg=0x3a2bbb0) at /bzr/5.6_dbg/Percona-Server-5.6.11-rc60.3/sql/sql_connect.cc:1526
#23 0x00000000009beb49 in pfs_spawn_thread (arg=0x39a5c20) at /bzr/5.6_dbg/Percona-Server-5.6.11-rc60.3/storage/perfschema/pfs.cc:1853
#24 0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#25 0x0000003fddee890d in clone () from /lib64/libc.so.6