FLUSH BINARY LOGS waits/hangs on mysql_mutex_unlock(&LOCK_index) forever

Thread 1044 (Thread 0x7fcfae319700 (LWP 112070)):

#0  0x00007fde4ea07a35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0

No symbol table info available.

#1  0x00005642bbfd68ec in inline_mysql_cond_wait (src_file=0x5642bc72b7b8 "/home/jenkins/workspace/Build-Package/padding_for_CPACK_RPM_BUILD_SOURCE_DIRS_PREFIX_ON_ES_BACKUP_DEBUGSOURCE/sql/log.cc", src_line=4491, mutex=<optimized out>, that=0x5642bd05e6c0 <mysql_bin_log+1248>) at /usr/src/debug/MariaDB-/src_0/include/mysql/psi/mysql_thread.h:1233

        result = <optimized out>

#2  MYSQL_BIN_LOG::wait_for_last_checkpoint_event (this=this@entry=0x5642bd05e1e0 <mysql_bin_log>) at /usr/src/debug/MariaDB-/src_0/sql/log.cc:4491

No locals.

#3  0x00005642bbdf1017 in reload_acl_and_cache (thd=thd@entry=0x7fcfcc2ce168, options=1024, tables=tables@entry=0x0, write_to_binlog=write_to_binlog@entry=0x7fcfae317e70) at /usr/src/debug/MariaDB-/src_0/sql/sql_reload.cc:162

        drop_gtid_domain = <optimized out>

        result = false

        tmp_write_to_binlog = 0

#4  0x00005642bbcd979d in mysql_execute_command (thd=thd@entry=0x7fcfcc2ce168) at /usr/src/debug/MariaDB-/src_0/sql/sql_parse.cc:5524

        write_to_binlog = 1

        res = 0

        lex = 0x7fcfcc2d2088

        trace_command = {<Json_writer_struct> = {_vptr.Json_writer_struct = 0x5642bce1a0d0 <vtable for Json_writer_object+16>, my_writer = 0x0, context = {writer = 0x0}, closed = false}, <No data fields>}

        trace_command_steps = {<Json_writer_struct> = {_vptr.Json_writer_struct = 0x5642bce1a0f0 <vtable for Json_writer_array+16>, my_writer = 0x0, context = {writer = 0x0}, closed = false}, <No data fields>}

        orig_binlog_format = BINLOG_FORMAT_ROW

        up_result = 0

        rpl_filter = <optimized out>

        ots = {ctx = 0x7fcfcc2d1d38, traceable = false}

        orig_current_stmt_binlog_format = BINLOG_FORMAT_ROW

        select_lex = 0x7fcfcc2d2978

        first_table = 0x0

        all_tables = 0x0

        unit = 0x7fcfcc2d2150

        have_table_map_for_update = false

#5  0x00005642bbcde1f5 in mysql_parse (thd=thd@entry=0x7fcfcc2ce168, rawbuf=rawbuf@entry=0x7fcfcc0e0d50 "flush binary logs", length=length@entry=17, parser_state=parser_state@entry=0x7fcfae3182e0, is_com_multi=is_com_multi@entry=false, is_next_command=is_next_command@entry=false) at /usr/src/debug/MariaDB-/src_0/sql/sql_parse.cc:8127

        found_semicolon = <optimized out>

        error = <optimized out>

        lex = 0x7fcfcc2d2088

        err = <optimized out>

#6  0x00005642bbcdea5c in wsrep_mysql_parse (thd=thd@entry=0x7fcfcc2ce168, rawbuf=0x7fcfcc0e0d50 "flush binary logs", length=17, parser_state=parser_state@entry=0x7fcfae3182e0, is_com_multi=is_com_multi@entry=false, is_next_command=is_next_command@entry=false) at /usr/src/debug/MariaDB-/src_0/sql/sql_parse.cc:7930

        is_autocommit = true

        retry_autocommit = false

#7  0x00005642bbce17e1 in dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=0x7fcfcc2ce168, packet=packet@entry=0x7fcfcc282549 "flush binary logs", packet_length=packet_length@entry=17, is_com_multi=is_com_multi@entry=false, is_next_command=is_next_command@entry=false) at /usr/src/debug/MariaDB-/src_0/sql/sql_parse.cc:1877

        packet_end = 0x7fcfcc0e0d61 ""

        parser_state = {m_lip = {lookahead_token = -1, lookahead_yylval = 0x0, m_thd = 0x7fcfcc2ce168, m_ptr = 0x7fcfcc0e0d62 "", m_tok_start = 0x7fcfcc0e0d62 "", m_tok_end = 0x7fcfcc0e0d62 "", m_end_of_query = 0x7fcfcc0e0d61 "", m_tok_start_prev = 0x7fcfcc0e0d61 "", m_buf = 0x7fcfcc0e0d50 "flush binary logs", m_buf_length = 17, m_echo = true, m_echo_saved = false, m_cpp_buf = 0x7fcfcc0e0db8 "flush binary logs", m_cpp_ptr = 0x7fcfcc0e0dc9 "", m_cpp_tok_start = 0x7fcfcc0e0dc9 "", m_cpp_tok_start_prev = 0x7fcfcc0e0dc9 "", m_cpp_tok_end = 0x7fcfcc0e0dc9 "", m_body_utf8 = 0x0, m_body_utf8_ptr = 0x0, m_cpp_utf8_processed_ptr = 0x0, next_state = MY_LEX_END, found_semicolon = 0x0, ignore_space = false, stmt_prepare_mode = false, multi_statements = true, yylineno = 1, m_digest = 0x0, in_comment = NO_COMMENT, in_comment_saved = NO_COMMENT, m_cpp_text_start = 0x7fcfcc0e0fc7 "1", m_cpp_text_end = 0x7fcfcc0e0fc8 "", m_underscore_cs = 0x0}, m_yacc = {yacc_yyss = 0x0, yacc_yyvs = 0x0, m_set_signal_info = {m_item = {0x0 <repeats 12 times>}}, m_lock_type = TL_READ_DEFAULT, m_mdl_type = MDL_SHARED_READ}, m_digest_psi = 0x0}

        net = 0x7fcfcc2ce3e8

        do_end_of_statement = true

        __FUNCTION__ = "dispatch_command"

        error = false

        drop_more_results = false

#8  0x00005642bbce231f in do_command (thd=0x7fcfcc2ce168) at /usr/src/debug/MariaDB-/src_0/sql/sql_parse.cc:1371

        return_value = <optimized out>

        packet = 0x7fcfcc282548 "\003flush binary logs"

        packet_length = <optimized out>

        net = 0x7fcfcc2ce3e8

        command = COM_QUERY

        __FUNCTION__ = "do_command"

#9  0x00005642bbdd22c9 in do_handle_one_connection (connect=<optimized out>, connect@entry=0x5642f81cb3a8, put_in_cache=put_in_cache@entry=true) at /usr/src/debug/MariaDB-/src_0/sql/sql_connect.cc:1418

        create_user = true

        thr_create_utime = <optimized out>

        thd = 0x7fcfcc2ce168

#10 0x00005642bbdd2574 in handle_one_connection (arg=arg@entry=0x5642f81cb3a8) at /usr/src/debug/MariaDB-/src_0/sql/sql_connect.cc:1312

        connect = 0x5642f81cb3a8

#11 0x00005642bc1683a7 in pfs_spawn_thread (arg=0x5642f89df1f8) at /usr/src/debug/MariaDB-/src_0/storage/perfschema/pfs.cc:2201

        typed_arg = 0x5642f89df1f8

        user_arg = 0x5642f81cb3a8

        pfs = <optimized out>

        user_start_routine = 0x5642bbdd2540 <handle_one_connection(void*)>

        klass = <optimized out>

#12 0x00007fde4ea03ea5 in start_thread () from /lib64/libpthread.so.0

No symbol table info available.

#13 0x00007fde4df1e9fd in clone () from /lib64/libc.so.6

No symbol table info available.

 4263 bool MYSQL_BIN_LOG::reset_logs(THD *thd, bool create_new_log,

 4264                                rpl_gtid *init_state, uint32 init_state_len      ,

 4265                                ulong next_log_number)

 4266 {

...

 4464   if (!is_relay_log)

 4465   { 

 4466     xid_count_per_binlog *b;

 4467     /*

 4468       Remove all entries in the xid_count list except the last. 

 4469       Normally we will just be deleting all the entries that we waited for       to   

 4470       drop to zero above. But if we fail during RESET MASTER for some reas      on    

 4471       then we will not have created any new log file, and we may keep the       last  

 4472       of the old entries.

 4473     */

 4474     mysql_mutex_lock(&LOCK_xid_list);

 4475     for (;;)

 4476     { 

 4477       b= binlog_xid_count_list.head();

 4478       DBUG_ASSERT(b /* List can never become empty. */);

 4479       if (b->binlog_id == current_binlog_id)

 4480         break;

 4481       DBUG_ASSERT(b->xid_count == 0);

 4482       WSREP_XID_LIST_ENTRY("MYSQL_BIN_LOG::reset_logs(): Removing "

 4483                            "xid_list_entry for %s (%lu)", b);

 4484       delete binlog_xid_count_list.get();

 4485     }

 4486     mysql_cond_broadcast(&COND_xid_list);

 4487     reset_master_pending--;

 4488     mysql_mutex_unlock(&LOCK_xid_list);

 4489   }

 4490 

 4491   mysql_mutex_unlock(&LOCK_index);

 4492   mysql_mutex_unlock(&LOCK_log);

 4493   DBUG_RETURN(error);

 4494 }