Error while running mysql_upgrade

#mysql_upgrade -uroot -p

Phase 1/5: Checking mysql database

Processing databases

mysql

mysql.column_stats                                 OK

mysql.columns_priv                                 OK

mysql.db                                           OK

mysql.event                                        OK

mysql.func                                         OK

mysql.gtid_slave_pos                               OK

mysql.help_category                                OK

mysql.help_keyword                                 OK

mysql.help_relation                                OK

mysql.help_topic                                   OK

mysql.host                                         OK

mysql.index_stats                                  OK

mysql.innodb_index_stats                           OK

mysql.innodb_table_stats                           OK

mysql.ndb_binlog_index                             OK

mysql.plugin                                       OK

mysql.proc                                         OK

mysql.procs_priv                                   OK

mysql.proxies_priv                                 OK

mysql.roles_mapping                                OK

mysql.servers                                      OK

mysql.table_stats                                  OK

mysql.tables_priv                                  OK

mysql.time_zone                                    OK

mysql.time_zone_leap_second                        OK

mysql.time_zone_name                               OK

mysql.time_zone_transition                         OK

mysql.time_zone_transition_type                    OK

mysql.user                                         OK

Phase 2/5: Running 'mysql_fix_privilege_tables'...

ERROR 2013 (HY000) at line 584: Lost connection to MySQL server during query

ERROR 2006 (HY000) at line 585: MySQL server has gone away

Version: '10.1.2-MariaDB-wsrep'  socket: '/var/lib/mysql/mysql.sock'  port: 3306  MariaDB Server, wsrep_25.10.r4123

141225 19:56:07 [ERROR] mysqld got signal 11 ;

This could be because you hit a bug. It is also possible that this binary

or one of the libraries it was linked against is corrupt, improperly built,

or misconfigured. This error can also be caused by malfunctioning hardware.

To report this bug, see http://kb.askmonty.org/en/reporting-bugs

We will try our best to scrape up some info that will hopefully help

diagnose the problem, but since we have already crashed, 

something is definitely wrong and this may fail.

Server version: 10.1.2-MariaDB-wsrep

key_buffer_size=134217728

read_buffer_size=131072

max_used_connections=2

max_threads=153

thread_count=2

It is possible that mysqld could use up to 

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 467237 K  bytes of memory

Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0x7f4218fef008

Attempting backtrace. You can use the following information to find out

where mysqld died. If you see no messages after this, something went

terribly wrong...

stack_bottom = 0x7f422fefbcf0 thread_stack 0x48000

/usr/sbin/mysqld(my_print_stacktrace+0x2e)[0x7f42309f687e]

/usr/sbin/mysqld(handle_fatal_signal+0x37d)[0x7f423055bf2d]

/lib64/libpthread.so.0(+0x308960f6d0)[0x7f422fbb36d0]

/usr/sbin/mysqld(thd_get_ha_data+0xa)[0x7f42303bb32a]

/usr/sbin/mysqld(_Z13get_trans_logP3THD+0x31)[0x7f423061ce71]

/usr/sbin/mysqld(wsrep_run_wsrep_commit+0x62c)[0x7f42304fafec]

/usr/sbin/mysqld(+0x71790a)[0x7f42306fa90a]

/usr/sbin/mysqld(_ZN7handler12ha_write_rowEPh+0x3bf)[0x7f4230565caf]

/usr/sbin/mysqld(+0x3555bb)[0x7f42303385bb]

/usr/sbin/mysqld(_Z17mysql_alter_tableP3THDPcS1_P14HA_CREATE_INFOP10TABLE_LISTP10Alter_infojP8st_orderb+0x3501)[0x7f4230472f91]

/usr/sbin/mysqld(_ZN19Sql_cmd_alter_table7executeEP3THD+0x65a)[0x7f42304b632a]

/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x182b)[0x7f42303ebbfb]

/usr/sbin/mysqld(_ZN18Prepared_statement7executeEP6Stringb+0x496)[0x7f4230405b96]

/usr/sbin/mysqld(+0x422d03)[0x7f4230405d03]

/usr/sbin/mysqld(_Z22mysql_sql_stmt_executeP3THD+0xb3)[0x7f42304062e3]

/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x1afe)[0x7f42303ebece]

/usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x20b)[0x7f42303f2d5b]

/usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x21a5)[0x7f42303f5cc5]

/usr/sbin/mysqld(_Z10do_commandP3THD+0x134)[0x7f42303f63f4]

/usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0x18a)[0x7f42304b351a]

/usr/sbin/mysqld(handle_one_connection+0x40)[0x7f42304b36e0]

/lib64/libpthread.so.0(+0x3089607ee5)[0x7f422fbabee5]

/lib64/libc.so.6(clone+0x6d)[0x7f422dfcbb8d]

Trying to get some variables.

Some pointers may be invalid and cause the dump to abort.

Query (0x7f42029a54a0): is an invalid pointer

Connection ID (thread ID): 13

Status: NOT_KILLED

Optimizer switch: index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pus

hdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cach

e=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=of

f,table_elimination=on,extended_keys=on,exists_to_in=on

The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains

information that should help you find out what is causing the crash.

141225 19:56:08 mysqld_safe Number of processes running now: 0

141225 19:56:08 mysqld_safe mysqld restarted

141225 19:56:08 mysqld_safe WSREP: Running position recovery with --log_error='/var/lib/mysql/wsrep_recovery.OABotj' --pid-file='/var/lib/mysql/c4.pune.mangopulse.com-recover.pid'