mysqld would have been started with the following arguments:

--datadir=/var/lib/mysql --tmpdir=/var/lib/tmp --socket=/var/lib/mysql/mysql.sock --pid_file=/var/lib/mysql/mysql.pid --user=mysql --port=3306 --max_connections=1500 --default_storage_engine=innodb --innodb_buffer_pool_size=4G --innodb_log_file_size=64M --innodb_file_per_table=1 --innodb_flush_method=O_DIRECT --innodb_thread_concurrency=6 --innodb_autoinc_lock_mode=2 --key_buffer_size=512M --log_error=/var/log/mysqld.err --log_slow_queries=/var/log/mysql/mysql-slow.log --long_query_time=5 --server-id=1 --binlog_format=ROW --relay-log=mysql-relay-bin --log-slave-updates=1 --sync_binlog=1 --read_only=0 --skip_slave_start --slave-skip-errors=1062,1054,1146,1452,1580,1032,1050,1235,1236,1053,1051 --log-bin=/var/lib/mysql/mysql-bin --log-bin-index=/var/lib/mysql/mysql-bin.index --expire-logs-days=5 --tmp_table_size=32M --max_heap_table_size=32M --query_cache_type=0 --query_cache_size=0 --max_connections=1500 --thread_cache_size=8 --open_files_limit=65535 --thread_concurrency=12 --table_open_cache=15000 --read_buffer_size=4M --read_rnd_buffer_size=16M --interactive_timeout=1200 --wait_timeout=1200 --plugin-load=ha_tokudb.so 

160211 17:50:12 [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: 5.5.47-MariaDB-log

key_buffer_size=536870912

read_buffer_size=4194304

max_used_connections=889

max_threads=1502

thread_count=309

It is possible that mysqld could use up to 

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 9779359 K  bytes of memory

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

Thread pointer: 0x0x7f2d5adba000

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 = 0x7f2d97f23d60 thread_stack 0x48000

/usr/sbin/mysqld(my_print_stacktrace+0x2b)[0xa75aeb]

/usr/sbin/mysqld(handle_fatal_signal+0x398)[0x6d15f8]

/lib64/libpthread.so.0[0x3b0ec0f710]

/usr/sbin/mysqld[0x5be4fd]

/usr/sbin/mysqld(_Z10sub_selectP4JOINP13st_join_tableb+0x166)[0x5be946]

/usr/sbin/mysqld[0x5be6b2]

/usr/sbin/mysqld(_Z10sub_selectP4JOINP13st_join_tableb+0x166)[0x5be946]

/usr/sbin/mysqld[0x5be6b2]

/usr/sbin/mysqld(_Z10sub_selectP4JOINP13st_join_tableb+0x1c9)[0x5be9a9]

/usr/sbin/mysqld[0x5d5a3d]

/usr/sbin/mysqld(_ZN4JOIN4execEv+0xa0b)[0x5eaffb]

/usr/sbin/mysqld(_Z12mysql_selectP3THDPPP4ItemP10TABLE_LISTjR4ListIS1_ES2_jP8st_orderSB_S2_SB_yP13select_resultP18st_select_lex_unitP13st_select_lex+0x125)[0x5e6385]

/usr/sbin/mysqld(_Z13handle_selectP3THDP3LEXP13select_resultm+0x2c3)[0x5ecfc3]

/usr/sbin/mysqld[0x5979a6]

/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x34bc)[0x5a0ffc]

/usr/sbin/mysqld[0x5a38d4]

/usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x1bf8)[0x5a5da8]

/usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0x21b)[0x656b2b]

/usr/sbin/mysqld(handle_one_connection+0x4c)[0x656bac]

/lib64/libpthread.so.0[0x3b0ec079d1]

/lib64/libc.so.6(clone+0x6d)[0x3b0e8e88fd]

Trying to get some variables.

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

Query (0x7f2d60beb018): is an invalid pointer

Connection ID (thread ID): 26984798

Status: NOT_KILLED