151229 13:18:09 [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: 10.1.10-MariaDB-1~jessie-log
key_buffer_size=16777216
read_buffer_size=524288
max_used_connections=43
max_threads=102
thread_count=17
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 488463 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0x7fa4be33e008
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 = 0x7fa4e0ed0df8 thread_stack 0x48000
/usr/sbin/mysqld(my_print_stacktrace+0x2e)[0x56359024914e]
/usr/sbin/mysqld(handle_fatal_signal+0x34d)[0x56358fd8cadd]
/lib/x86_64-linux-gnu/libpthread.so.0(+0xf8d0)[0x7fa4f689f8d0]
/usr/sbin/mysqld(_ZN10Item_field35switch_to_nullable_fields_processorEPh+0x1b)[0x56358fd99f6b]
/usr/sbin/mysqld(_ZN14Item_subselect4walkEM4ItemFbPhEbS1_+0xb7)[0x56358fe0f4f7]
/usr/sbin/mysqld(_Z33switch_to_nullable_trigger_fieldsR4ListI4ItemEP5TABLE+0x58)[0x56358fbc9838]
/usr/sbin/mysqld(_Z12mysql_updateP3THDP10TABLE_LISTR4ListI4ItemES6_PS4_jP8st_ordery15enum_duplicatesbPySB_+0x8c2)[0x56358fca3fe2]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x3d57)[0x56358fc06ea7]
/usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x20e)[0x56358fc0c5fe]
/usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x1eca)[0x56358fc0f2fa]
/usr/sbin/mysqld(_Z10do_commandP3THD+0x16e)[0x56358fc0fb4e]
/usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0x182)[0x56358fcd8602]
/usr/sbin/mysqld(handle_one_connection+0x40)[0x56358fcd87c0]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x80a4)[0x7fa4f68980a4]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7fa4f49d404d]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (0x7fa4cc906020): UPDATE `Sale` SET `Sales_CustomerVAT` = (SELECT `VAT` FROM `Customer` WHERE `Customer_ID` = '10000219') WHERE `Sales_ID` = '14007788'
Connection ID (thread ID): 218381
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