CONNECT Engine crashes with JSON table type

mysqld: /home/buildbot/buildbot/build/mariadb-10.1.20/storage/connect/plugutil.c:520: PlugSubAlloc: Assertion `g->jump_level >= 0' failed.

170418 19:59:53 [ERROR] mysqld got signal 6 ;

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: 10.1.20-MariaDB

key_buffer_size=1048576

read_buffer_size=262144

max_used_connections=24

max_threads=502

thread_count=22

It is possible that mysqld could use up to 

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 653874 K  bytes of memory

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

Thread pointer: 0x0x7f66159d4008

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 = 0x7f66ec523d40 thread_stack 0x3c000

/usr/sbin/mysqld(my_print_stacktrace+0x2b)[0x7f66fcd085cb]

/usr/sbin/mysqld(handle_fatal_signal+0x4d5)[0x7f66fc861375]

/lib64/libpthread.so.0(+0xf7e0)[0x7f66fbe637e0]

/lib64/libc.so.6(gsignal+0x35)[0x7f66fa2895e5]

/lib64/libc.so.6(abort+0x175)[0x7f66fa28adc5]

/lib64/libc.so.6(+0x2b70e)[0x7f66fa28270e]

/lib64/libc.so.6(__assert_perror_fail+0x0)[0x7f66fa2827d0]

/usr/lib64/mysql/plugin/ha_connect.so(PlugSubAlloc+0x16f)[0x7f66f630214f]

/usr/lib64/mysql/plugin/ha_connect.so(_Z7SetPathP7_globalPKc+0x38)[0x7f66f6338138]

mysys/stacktrace.c:268(my_print_stacktrace)[0x7f66f62f0107]

/usr/lib64/mysql/plugin/ha_connect.so(_Z10CntCheckDBP7_globalP10ha_connectPKc+0x96)[0x7f66f62fce56]

/usr/lib64/mysql/plugin/ha_connect.so(_ZN10ha_connect4openEPKcij+0xce)[0x7f66f62efcae]

/usr/sbin/mysqld(_ZN7handler7ha_openEP5TABLEPKcij+0x3e)[0x7f66fc86560e]

sql/handler.cc:2501(handler::ha_open(TABLE*, char const*, int, unsigned int))[0x7f66fc7908f3]

sql/table.cc:2930(open_table_from_share(THD*, TABLE_SHARE*, char const*, unsigned int, unsigned int, unsigned int, TABLE*, bool))[0x7f66fc6a95f5]

sql/sql_base.cc:2554(open_table(THD*, TABLE_LIST*, Open_table_context*))[0x7f66fc6adb02]

sql/sql_base.cc:5258(open_and_lock_tables(THD*, DDL_options_st const&, TABLE_LIST*, bool, unsigned int, Prelocking_strategy*))[0x7f66fc6ade84]

/usr/sbin/mysqld(+0x451dd3)[0x7f66fc6e4dd3]

/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x5d8c)[0x7f66fc6f10fc]

sql/sql_parse.cc:5817(execute_sqlcom_select)[0x7f66fc6f46b4]

sql/sql_parse.cc:1487(dispatch_command(enum_server_command, THD*, char*, unsigned int))[0x7f66fc6f7183]

sql/sql_parse.cc:1110(do_command(THD*))[0x7f66fc6f771b]

sql/sql_connect.cc:1350(do_handle_one_connection(THD*))[0x7f66fc7b5fff]

sql/sql_connect.cc:1264(handle_one_connection)[0x7f66fc7b6157]

/lib64/libpthread.so.0(+0x7aa1)[0x7f66fbe5baa1]

/lib64/libc.so.6(clone+0x6d)[0x7f66fa33faad]

Trying to get some variables.

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

Query (0x7f6614d5c020): is an invalid pointer

Connection ID (thread ID): 22

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,orderby_uses_equalities=off