CURRENT_TEST: main.greedy_optimizer
mysqltest got signal 6
read_command_buf (0x631000014818): }

conn->name (0x603000001168): 

Attempting backtrace...
stack_bottom = 0x0 thread_stack 0x3c000
/lib/x86_64-linux-gnu/libasan.so.5(+0x6cd30)[0x7f6fa2246d30]
mysys/stacktrace.c:215(my_print_stacktrace)[0x55fc83582052]
client/mysqltest.cc:10086(dump_backtrace())[0x55fc83440821]
client/mysqltest.cc:10102(signal_handler)[0x55fc83440985]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x153c0)[0x7f6fa21cc3c0]
/lib/x86_64-linux-gnu/libc.so.6(__poll+0x17)[0x7f6fa1393ac7]
/lib/x86_64-linux-gnu/libasan.so.5(poll+0xaa)[0x7f6fa22165ba]
pvio/pvio_socket.c:532(pvio_socket_wait_io_or_timeout)[0x55fc83528f83]
pvio/pvio_socket.c:318(pvio_socket_read)[0x55fc83529136]
libmariadb/ma_pvio.c:255(ma_pvio_read)[0x55fc834b90ab]
libmariadb/ma_pvio.c:299(ma_pvio_cache_read)[0x55fc834b9631]
libmariadb/ma_net.c:385(ma_real_read)[0x55fc83534259]
libmariadb/ma_net.c:439(ma_net_read)[0x55fc83536988]
libmariadb/mariadb_lib.c:215(ma_net_safe_read)[0x55fc834a3f5e]
libmariadb/mariadb_lib.c:2869(mthd_my_read_query_result)[0x55fc834b5347]
libmariadb/mariadb_lib.c:2958(mysql_read_query_result)[0x55fc8348cc53]
tests/nonblock-wrappers.h:324(wrap_mysql_read_query_result(st_mysql*))[0x55fc8344244d]
client/mysqltest.cc:8393(run_query_normal(st_connection*, st_command*, int, char const*, unsigned long, st_dynamic_string*, st_dynamic_string*))[0x55fc834760f8]
client/mysqltest.cc:9748(run_query(st_connection*, st_command*, int))[0x55fc83478040]
client/mysqltest.cc:10583(main)[0x55fc8347af53]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3)[0x7f6fa12a50b3]
/home/buildbot/buildbot/build/mariadb-12.1.0/client//mariadb-test(_start+0x2e)[0x55fc8343f54e]
Writing a core file...
