handle_fatal_signal (sig=11) in intern_plugin_lock

#0  __pthread_kill (threadid=<optimized out>, signo=11) at ../sysdeps/unix/sysv/linux/pthread_kill.c:62
#1  0x000000000475d0a3 in my_write_core (sig=11) at /mnt/workspace/qa.pxc80.build/BUILD_TYPE/debug/Host/min-xenial-x64/mysys/stacktrace.cc:278
#2  0x000000000359acc4 in handle_fatal_signal (sig=11) at /mnt/workspace/qa.pxc80.build/BUILD_TYPE/debug/Host/min-xenial-x64/sql/signal_handler.cc:264
#3  <signal handler called>
#4  0x00000000033e6c90 in intern_plugin_lock (lex=0x7f98d6c28800, rc=0x7f98fc2c6940) at /mnt/workspace/qa.pxc80.build/BUILD_TYPE/debug/Host/min-xenial-x64/sql/sql_plugin.cc:905
#5  0x00000000033edada in find_sys_var_ex (thd=0x7f98d6c24000, str=0x7f98b9645a18 "keyring_vault_config", length=20, throw_error=false, locked=false) at /mnt/workspace/qa.pxc80.build/BUILD_TYPE/debug/Host/min-xenial-x64/sql/sql_plugin.cc:2616
#6  0x00000000033edbf5 in find_sys_var (thd=0x7f98d6c24000, str=0x7f98b9645a18 "keyring_vault_config", length=20) at /mnt/workspace/qa.pxc80.build/BUILD_TYPE/debug/Host/min-xenial-x64/sql/sql_plugin.cc:2633
#7  0x00000000037b500a in find_sys_var_null_base (thd=0x7f98d6c24000, tmp=0x7f98b9645a68) at /mnt/workspace/qa.pxc80.build/BUILD_TYPE/debug/Host/min-xenial-x64/sql/parse_tree_helpers.cc:112
#8  0x000000000321710f in PT_internal_variable_name_1d::contextualize (this=0x7f98b9645a58, pc=0x7f991a0e7c10) at /mnt/workspace/qa.pxc80.build/BUILD_TYPE/debug/Host/min-xenial-x64/sql/parse_tree_nodes.cc:247
#9  0x0000000003621b15 in PT_option_value_no_option_type_sys_var::contextualize (this=0x7f98b9645b40, pc=0x7f991a0e7c10) at /mnt/workspace/qa.pxc80.build/BUILD_TYPE/debug/Host/min-xenial-x64/sql/parse_tree_nodes.h:1078
#10 0x000000000362236d in PT_start_option_value_list_no_type::contextualize (this=0x7f98b9645b60, pc=0x7f991a0e7c10) at /mnt/workspace/qa.pxc80.build/BUILD_TYPE/debug/Host/min-xenial-x64/sql/parse_tree_nodes.h:1269
#11 0x0000000003622fe8 in PT_set::contextualize (this=0x7f98b9645ba0, pc=0x7f991a0e7c10) at /mnt/workspace/qa.pxc80.build/BUILD_TYPE/debug/Host/min-xenial-x64/sql/parse_tree_nodes.h:1466
#12 0x00000000035e3f4f in MYSQLparse (YYTHD=0x7f98d6c24000, parse_tree=0x7f991a0e98f0) at /mnt/workspace/qa.pxc80.build/BUILD_TYPE/debug/Host/min-xenial-x64/sql/sql_yacc.yy:2116
#13 0x0000000003307096 in THD::sql_parser (this=0x7f98d6c24000) at /mnt/workspace/qa.pxc80.build/BUILD_TYPE/debug/Host/min-xenial-x64/sql/sql_class.cc:3363
#14 0x00000000033c1c32 in parse_sql (thd=0x7f98d6c24000, parser_state=0x7f991a0eac80, creation_ctx=0x0) at /mnt/workspace/qa.pxc80.build/BUILD_TYPE/debug/Host/min-xenial-x64/sql/sql_parse.cc:8014
#15 0x00000000033bbd84 in mysql_parse (thd=0x7f98d6c24000, parser_state=0x7f991a0eac80, update_userstat=false, force_primary_storage_engine=false) at /mnt/workspace/qa.pxc80.build/BUILD_TYPE/debug/Host/min-xenial-x64/sql/sql_parse.cc:5982
#16 0x00000000033bfd0d in wsrep_mysql_parse (thd=0x7f98d6c24000, rawbuf=0x7f98b9645028 "SET @@global.keyring_vault_config=1", length=35, parser_state=0x7f991a0eac80, update_userstat=false, force_primary_storage_engine=false) at /mnt/workspace/qa.pxc80.build/BUILD_TYPE/debug/Host/min-xenial-x64/sql/sql_parse.cc:7263
#17 0x00000000033ae3c9 in dispatch_command (thd=0x7f98d6c24000, com_data=0x7f991a0ecc50, command=COM_QUERY) at /mnt/workspace/qa.pxc80.build/BUILD_TYPE/debug/Host/min-xenial-x64/sql/sql_parse.cc:2050
#18 0x00000000033abb85 in do_command (thd=0x7f98d6c24000) at /mnt/workspace/qa.pxc80.build/BUILD_TYPE/debug/Host/min-xenial-x64/sql/sql_parse.cc:1419
#19 0x000000000358428f in handle_connection (arg=0x7f990b7f2760) at /mnt/workspace/qa.pxc80.build/BUILD_TYPE/debug/Host/min-xenial-x64/sql/conn_handler/connection_handler_per_thread.cc:311
#20 0x0000000004853dc6 in pfs_spawn_thread (arg=0x7f98b85a7f20) at /mnt/workspace/qa.pxc80.build/BUILD_TYPE/debug/Host/min-xenial-x64/storage/perfschema/pfs.cc:2836
#21 0x00007f991bf176ba in start_thread (arg=0x7f991a0ee700) at pthread_create.c:333
#22 0x00007f991a2cb41d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109