main.lock_tables_lost_commit failed in buildbot with timeout, Trying to lock mutex at sql/sql_base.cc, line 958, when the mutex was already locked

main.lock_tables_lost_commit 'innodb'    w4 [ fail ]

        Test ended at 2021-01-17 10:42:34

CURRENT_TEST: main.lock_tables_lost_commit

Warning: /mnt/buildbot/build/mariadb-10.5.9/libmysqld/examples/mysqltest_embedded: unknown variable 'loose-ssl-ca=/mnt/buildbot/build/mariadb-10.5.9/mysql-test/std_data/cacert.pem'

Warning: /mnt/buildbot/build/mariadb-10.5.9/libmysqld/examples/mysqltest_embedded: unknown variable 'loose-ssl-cert=/mnt/buildbot/build/mariadb-10.5.9/mysql-test/std_data/client-cert.pem'

Warning: /mnt/buildbot/build/mariadb-10.5.9/libmysqld/examples/mysqltest_embedded: unknown variable 'loose-ssl-key=/mnt/buildbot/build/mariadb-10.5.9/mysql-test/std_data/client-key.pem'

Warning: /mnt/buildbot/build/mariadb-10.5.9/libmysqld/examples/mysqltest_embedded: unknown option '--loose-skip-ssl'

Got ERROR: "InnoDB: Operating system error number 2 in a file operation." errno: 2000

Got ERROR: "InnoDB: The error means the system cannot find the path specified." errno: 2000

Got ERROR: "InnoDB: If you are installing InnoDB, remember that you must create directories yourself, InnoDB does not create them." errno: 2000

Got ERROR: "InnoDB: Cannot open datafile for read-only: './mysql/innodb_index_stats.ibd' OS error: 71" errno: 2000

Got ERROR: "InnoDB: Operating system error number 2 in a file operation." errno: 2000

Got ERROR: "InnoDB: The error means the system cannot find the path specified." errno: 2000

Got ERROR: "InnoDB: If you are installing InnoDB, remember that you must create directories yourself, InnoDB does not create them." errno: 2000

Got ERROR: "InnoDB: Cannot open datafile for read-only: './mysql/innodb_table_stats.ibd' OS error: 71" errno: 2000

Got ERROR: "InnoDB: Operating system error number 2 in a file operation." errno: 2000

Got ERROR: "InnoDB: The error means the system cannot find the path specified." errno: 2000

Got ERROR: "InnoDB: If you are installing InnoDB, remember that you must create directories yourself, InnoDB does not create them." errno: 2000

Got ERROR: "InnoDB: Cannot open datafile for read-only: './mysql/transaction_registry.ibd' OS error: 71" errno: 2000

safe_mutex: Trying to lock mutex at /home/buildbot/buildbot/build/mariadb-10.5.9/sql/sql_base.cc, line 958, when the mutex was already locked at /home/buildbot/buildbot/build/mariadb-10.5.9/sql/sql_class.cc, line 1645 in thread T@20

mysqltest got signal 6

read_command_buf (0x834c36b8): disc

conn->name (0x83754618): con1

conn->cur_query (0x837e60d8): INSERT INTO t1 VALUES(10)

Attempting backtrace...

stack_bottom = 0x0 thread_stack 0x49000

mysys/stacktrace.c:212(my_print_stacktrace)[0x804f17a5]

client/mysqltest.cc:9024(dump_backtrace())[0x804979e6]

client/mysqltest.cc:9041(signal_handler)[0x80497a24]

addr2line: '': No such file

[0xb77d4c14]

[0xb77d4c31]

??:0(gsignal)[0xb70bee89]

??:0(abort)[0xb70c03e7]

mysys/thr_mutex.c:265(safe_mutex_lock)[0x804ebf8b]

psi/mysql_thread.h:765(inline_mysql_mutex_lock)[0x8086abc3]

sql/sql_base.cc:958(close_thread_table(THD*, TABLE**))[0x8086cbce]

sql/sql_base.cc:919(close_thread_tables(THD*))[0x8086c8d5]

sql/sql_base.cc:2376(Locked_tables_list::unlock_locked_tables(THD*))[0x8086fad7]

sql/sql_class.cc:1562(THD::cleanup(bool))[0x80847b04]

sql/sql_class.cc:1661(THD::free_connection())[0x80847fa1]

sql/sql_class.cc:1731(THD::~THD())[0x808482a0]

sql/sql_class.cc:1792(THD::~THD())[0x80848743]

libmysqld/lib_sql.cc:440(emb_free_embedded_thd)[0x804bd52d]

sql-common/client.c:3515(mysql_close)[0x804a8f72]

client/mysqltest.cc:946(connection_thread)[0x80486276]

??:0(start_thread)[0xb77ab2b5]

??:0(clone)[0xb717a16e]

Writing a core file...