MariaDB [(none)]> SHOW GLOBAL VARIABLES LIKE '%query_cache%';

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

| Variable_name                | Value    |

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

| have_query_cache             | YES      |

| query_cache_limit            | 262144   |

| query_cache_min_res_unit     | 4096     |

| query_cache_size             | 83886080 |

| query_cache_strip_comments   | OFF      |

| query_cache_type             | ON       |

| query_cache_wlock_invalidate | OFF      |

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

7 rows in set (0.00 sec)

MariaDB [(none)]> SET GLOBAL query_cache_type = OFF;

Query OK, 0 rows affected (0.09 sec)

180424 15:46:34 [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 https://mariadb.com/kb/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: 10.1.32-MariaDB-1~xenial

key_buffer_size=17179869184

read_buffer_size=2097152

max_used_connections=351

max_threads=352

thread_count=186

It is possible that mysqld could use up to 

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 19668105 K  bytes of memory

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

Thread pointer: 0x7f26d0dec008

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 = 0x7f268b3c3cb8 thread_stack 0x30000

*** buffer overflow detected ***: /usr/sbin/mysqld terminated

======= Backtrace: =========

/lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7f2b0c2137e5]

/lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x5c)[0x7f2b0c2b515c]

/lib/x86_64-linux-gnu/libc.so.6(+0x117160)[0x7f2b0c2b3160]

/lib/x86_64-linux-gnu/libc.so.6(+0x1190a7)[0x7f2b0c2b50a7]

/usr/sbin/mysqld(my_addr_resolve+0xd4)[0x5574949df634]

/usr/sbin/mysqld(my_print_stacktrace+0x1e2)[0x5574949c91d2]

/usr/sbin/mysqld(handle_fatal_signal+0x2f5)[0x5574945101d5]

/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f2b0cc02390]

/lib/x86_64-linux-gnu/libpthread.so.0(pthread_rwlock_unlock+0x2c)[0x7f2b0cbfdedc]

/usr/sbin/mysqld(_ZN11Query_cache11store_queryEP3THDP10TABLE_LIST+0x4a4)[0x5574943420d4]

/usr/sbin/mysqld(+0x354a68)[0x5574942c2a68]

/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x71bb)[0x5574943802cb]

/usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x311)[0x5574943824d1]

/usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x25a0)[0x557494385b80]

/usr/sbin/mysqld(_Z10do_commandP3THD+0x219)[0x557494386439]

/usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0x182)[0x557494454dd2]

/usr/sbin/mysqld(handle_one_connection+0x40)[0x557494454f70]

/lib/x86_64-linux-gnu/libpthread.so.0(+0x76ba)[0x7f2b0cbf86ba]

/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7f2b0c2a341d]