MariaDB [(none)]> show processlist;

+----+------+----------------------+------+---------+------+-------+------------------+----------+

| Id | User | Host                 | db   | Command | Time | State | Info             | Progress |

+----+------+----------------------+------+---------+------+-------+------------------+----------+

|  3 | root | localhost            | NULL | Query   |    0 | init  | show processlist |    0.000 |

|  4 | test | localhost            | NULL | Sleep   |   20 |       | NULL             |    0.000 |

|  5 | test | 192.168.26.172:14061 | NULL | Sleep   |   14 |       | NULL             |    0.000 |

+----+------+----------------------+------+---------+------+-------+------------------+----------+

3 rows in set (0.00 sec)

MariaDB [(none)]> kill user 'test'@'192.168.26.172';

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

MariaDB [(none)]> show processlist;

ERROR 2006 (HY000): MySQL server has gone away

No connection. Trying to reconnect...

Connection id:    3

Current database: *** NONE ***

+----+------+-----------+------+---------+------+-------+------------------+----------+

| Id | User | Host      | db   | Command | Time | State | Info             | Progress |

+----+------+-----------+------+---------+------+-------+------------------+----------+

|  3 | root | localhost | NULL | Query   |    0 | init  | show processlist |    0.000 |

+----+------+-----------+------+---------+------+-------+------------------+----------+

1 row in set (0.00 sec)

Version: '10.0.12-MariaDB-log'  socket: '/tmp/mysql99.sock'  port: 3306  MariaDB Server

141020 14:33:12 [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: 10.0.12-MariaDB-log

key_buffer_size=134217728

read_buffer_size=131072

max_used_connections=3

max_threads=153

thread_count=3

It is possible that mysqld could use up to

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 467144 K  bytes of memory

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

Thread pointer: 0x0x7feb7b7f5008

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 = 0x7feb94db4d10 thread_stack 0x48000

/usr/sbin/mysqld(my_print_stacktrace+0x2b)[0xb6c14b]

/usr/sbin/mysqld(handle_fatal_signal+0x398)[0x7255f8]

/lib64/libpthread.so.0[0x377d60f500]

/lib64/libc.so.6[0x377d327a96]

/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x599f)[0x5d4d5f]

/usr/sbin/mysqld[0x5d5b12]

/usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x1b20)[0x5d7cd0]

/usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0x453)[0x6950e3]

/usr/sbin/mysqld(handle_one_connection+0x42)[0x6951b2]

/lib64/libpthread.so.0[0x377d607851]

/lib64/libc.so.6(clone+0x6d)[0x377d2e890d]

Trying to get some variables.

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

Query (0x7feb6a81e020): is an invalid pointer

Connection ID (thread ID): 3

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_pushdown=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_cache=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=off,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.

141020 14:33:12 mysqld_safe Number of processes running now: 0

141020 14:33:12 mysqld_safe mysqld restarted

141020 14:33:12 [Note] InnoDB: Using mutexes to ref count buffer pool pages

141020 14:33:12 [Note] InnoDB: The InnoDB memory heap is disabled

141020 14:33:12 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins

141020 14:33:12 [Note] InnoDB: Compressed tables use zlib 1.2.3

141020 14:33:12 [Note] InnoDB: Using Linux native AIO

141020 14:33:12 [Note] InnoDB: Using CPU crc32 instructions

2014-10-20 14:33:12 7fad0089d840 InnoDB: Warning: io_setup() failed with EAGAIN. Will make 5 attempts before giving up.

InnoDB: Warning: io_setup() attempt 1 failed.

InnoDB: Warning: io_setup() attempt 2 failed.

InnoDB: Warning: io_setup() attempt 3 failed.

InnoDB: Warning: io_setup() attempt 4 failed.

InnoDB: Warning: io_setup() attempt 5 failed.

2014-10-20 14:33:14 7fad0089d840 InnoDB: Error: io_setup() failed with EAGAIN after 5 attempts.

InnoDB: You can disable Linux Native AIO by setting innodb_use_native_aio = 0 in my.cnf

  InnoDB: Warning: Linux Native AIO disabled because os_aio_linux_create_io_ctx() failed. To get rid of this warning you can try increasing system fs.aio-max-nr to 1048576 or larger or setting innodb_use_native_aio = 0 in my.cnf

141020 14:33:14 [Note] InnoDB: Initializing buffer pool, size = 128.0M

141020 14:33:14 [Note] InnoDB: Completed initialization of buffer pool

141020 14:33:14 [Note] InnoDB: Highest supported file format is Barracuda.

141020 14:33:14 [Note] InnoDB: The log sequence numbers 1616727 and 1616727 in ibdata files do not match the log sequence number 1244040091 in the ib_logfiles!

141020 14:33:14 [Note] InnoDB: Database was not shutdown normally!

141020 14:33:14 [Note] InnoDB: Starting crash recovery.

141020 14:33:14 [Note] InnoDB: Reading tablespace information from the .ibd files...

141020 14:33:14 [Note] InnoDB: Restoring possible half-written data pages

141020 14:33:14 [Note] InnoDB: from the doublewrite buffer...

InnoDB: Last MySQL binlog file position 0 316868674, file name /var/lib/mysql/99/sm_99db-bin.000016

141020 14:33:14 [Note] InnoDB: 128 rollback segment(s) are active.

141020 14:33:14 [Note] InnoDB: Waiting for purge to start

141020 14:33:14 [Note] InnoDB:  Percona XtraDB (http://www.percona.com) 5.6.17-65.0 started; log sequence number 1244040091

141020 14:33:14 [Note] Plugin 'FEEDBACK' is disabled.

141020 14:33:14 [Note] Recovering after a crash using /var/lib/mysql/99/sm_99db-bin

141020 14:33:14 [Note] Starting crash recovery...

141020 14:33:14 [Note] Crash recovery finished.

141020 14:33:14 [Note] Server socket created on IP: '0.0.0.0'.

141020 14:33:14 [Warning] 'user' entry 'root@hzih171' ignored in --skip-name-resolve mode.