mysqltest got signal 11

./mtr truncate_coverage --sp

==============================================================================

TEST                                      RESULT   TIME (ms) or COMMENT

--------------------------------------------------------------------------

worker[1] Using MTR_BUILD_THREAD 300, with reserved ports 16000..16019

main.truncate_coverage                   [ fail ]

        Test ended at 2021-06-15 13:57:25

CURRENT_TEST: main.truncate_coverage

mysqltest got signal 11

read_command_buf (0x631000014888): show sta

conn->name (0x60f0000066f8): -clo

Attempting backtrace...

stack_bottom = 0x0 thread_stack 0x3c000

??:0(__interceptor_tcgetattr)[0x7f079180fd30]

mysys/stacktrace.c:212(my_print_stacktrace)[0x55d78650fec4]

client/mysqltest.cc:9039(dump_backtrace())[0x55d786417d69]

client/mysqltest.cc:9055(signal_handler)[0x55d786417dc5]

sigaction.c:0(__restore_rt)[0x7f07917953c0]

client/mysqltest.cc:8502(util_query(st_mysql*, char const*))[0x55d78641585b]

client/mysqltest.cc:8673(run_query(st_connection*, st_command*, int))[0x55d7864164bc]

client/mysqltest.cc:9546(main)[0x55d78641a803]

csu/libc-start.c:342(__libc_start_main)[0x7f0790edd0b3]

??:0(_start)[0x55d7863e826e]

Writing a core file...