diff --git a/mysql-test/r/log_tables.result b/mysql-test/r/log_tables.result
index c61dd2247ee..8b0a5ea6a20 100644
--- a/mysql-test/r/log_tables.result
+++ b/mysql-test/r/log_tables.result
@@ -72,3 +72,149 @@ sleep(2)
 select * from mysql.slow_log;
 start_time	user_host	query_time	lock_time	rows_sent	rows_examined	db	last_insert_id	insert_id	server_id	sql_text
 TIMESTAMP	USER_HOST	QUERY_TIME	00:00:00	1	0	test	0	0	1	select sleep(2)
+alter table mysql.general_log engine=myisam;
+ERROR HY000: You can't alter a log table if logging is enabled
+alter table mysql.slow_log engine=myisam;
+ERROR HY000: You can't alter a log table if logging is enabled
+drop table mysql.general_log;
+ERROR HY000: Cannot drop log table if log is enabled
+drop table mysql.slow_log;
+ERROR HY000: Cannot drop log table if log is enabled
+set global general_log='OFF';
+alter table mysql.slow_log engine=myisam;
+ERROR HY000: You can't alter a log table if logging is enabled
+set global slow_query_log='OFF';
+show create table mysql.general_log;
+Table	Create Table
+general_log	CREATE TABLE `general_log` (
+  `event_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  `user_host` mediumtext,
+  `thread_id` int(11) DEFAULT NULL,
+  `server_id` int(11) DEFAULT NULL,
+  `command_type` varchar(64) DEFAULT NULL,
+  `argument` mediumtext
+) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='General log'
+show create table mysql.slow_log;
+Table	Create Table
+slow_log	CREATE TABLE `slow_log` (
+  `start_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  `user_host` mediumtext NOT NULL,
+  `query_time` time NOT NULL,
+  `lock_time` time NOT NULL,
+  `rows_sent` int(11) NOT NULL,
+  `rows_examined` int(11) NOT NULL,
+  `db` varchar(512) DEFAULT NULL,
+  `last_insert_id` int(11) DEFAULT NULL,
+  `insert_id` int(11) DEFAULT NULL,
+  `server_id` int(11) DEFAULT NULL,
+  `sql_text` mediumtext NOT NULL
+) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='Slow log'
+alter table mysql.general_log engine=myisam;
+alter table mysql.slow_log engine=myisam;
+Warnings:
+Warning	1264	Out of range value for column 'last_insert_id' at row 0
+Warning	1264	Out of range value for column 'insert_id' at row 0
+show create table mysql.general_log;
+Table	Create Table
+general_log	CREATE TABLE `general_log` (
+  `event_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  `user_host` mediumtext,
+  `thread_id` int(11) DEFAULT NULL,
+  `server_id` int(11) DEFAULT NULL,
+  `command_type` varchar(64) DEFAULT NULL,
+  `argument` mediumtext
+) ENGINE=MyISAM DEFAULT CHARSET=utf8 COMMENT='General log'
+show create table mysql.slow_log;
+Table	Create Table
+slow_log	CREATE TABLE `slow_log` (
+  `start_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  `user_host` mediumtext NOT NULL,
+  `query_time` time NOT NULL,
+  `lock_time` time NOT NULL,
+  `rows_sent` int(11) NOT NULL,
+  `rows_examined` int(11) NOT NULL,
+  `db` varchar(512) DEFAULT NULL,
+  `last_insert_id` int(11) DEFAULT NULL,
+  `insert_id` int(11) DEFAULT NULL,
+  `server_id` int(11) DEFAULT NULL,
+  `sql_text` mediumtext NOT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=utf8 COMMENT='Slow log'
+set global general_log='ON';
+set global slow_query_log='ON';
+select * from mysql.general_log;
+event_time	user_host	thread_id	server_id	command_type	argument
+TIMESTAMP	USER_HOST	THREAD_ID	1	Query	set names utf8
+TIMESTAMP	USER_HOST	THREAD_ID	1	Query	create table bug16905 (s char(15) character set utf8 default 'пусто')
+TIMESTAMP	USER_HOST	THREAD_ID	1	Query	insert into bug16905 values ('новое')
+TIMESTAMP	USER_HOST	THREAD_ID	1	Query	select * from mysql.general_log
+TIMESTAMP	USER_HOST	THREAD_ID	1	Query	drop table bug16905
+TIMESTAMP	USER_HOST	THREAD_ID	1	Query	truncate table mysql.slow_log
+TIMESTAMP	USER_HOST	THREAD_ID	1	Query	set session long_query_time=1
+TIMESTAMP	USER_HOST	THREAD_ID	1	Query	select sleep(2)
+TIMESTAMP	USER_HOST	THREAD_ID	1	Query	select * from mysql.slow_log
+TIMESTAMP	USER_HOST	THREAD_ID	1	Query	alter table mysql.general_log engine=myisam
+TIMESTAMP	USER_HOST	THREAD_ID	1	Query	alter table mysql.slow_log engine=myisam
+TIMESTAMP	USER_HOST	THREAD_ID	1	Query	drop table mysql.general_log
+TIMESTAMP	USER_HOST	THREAD_ID	1	Query	drop table mysql.slow_log
+TIMESTAMP	USER_HOST	THREAD_ID	1	Query	set global general_log='OFF'
+TIMESTAMP	USER_HOST	THREAD_ID	1	Query	set global slow_query_log='ON'
+TIMESTAMP	USER_HOST	THREAD_ID	1	Query	select * from mysql.general_log
+flush logs;
+lock tables mysql.general_log WRITE;
+ERROR HY000: You can't write-lock a log table. Only read access is possible.
+lock tables mysql.slow_log WRITE;
+ERROR HY000: You can't write-lock a log table. Only read access is possible.
+lock tables mysql.general_log READ;
+ERROR HY000: You can't use usual read lock with log tables. Try READ LOCAL instead.
+lock tables mysql.slow_log READ;
+ERROR HY000: You can't use usual read lock with log tables. Try READ LOCAL instead.
+lock tables mysql.slow_log READ LOCAL, mysql.general_log READ LOCAL;
+unlock tables;
+set global general_log='OFF';
+set global slow_query_log='OFF';
+alter table mysql.slow_log engine=ndb;
+ERROR HY000: One can use only CSV and MyISAM engines for the log tables
+alter table mysql.slow_log engine=innodb;
+ERROR HY000: One can use only CSV and MyISAM engines for the log tables
+alter table mysql.slow_log engine=archive;
+ERROR HY000: One can use only CSV and MyISAM engines for the log tables
+alter table mysql.slow_log engine=blackhole;
+ERROR HY000: One can use only CSV and MyISAM engines for the log tables
+drop table mysql.slow_log;
+drop table mysql.general_log;
+drop table mysql.general_log;
+ERROR 42S02: Unknown table 'general_log'
+drop table mysql.slow_log;
+ERROR 42S02: Unknown table 'slow_log'
+use mysql;
+CREATE TABLE `general_log` (
+`event_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP
+ON UPDATE CURRENT_TIMESTAMP,
+`user_host` mediumtext,
+`thread_id` int(11) DEFAULT NULL,
+`server_id` int(11) DEFAULT NULL,
+`command_type` varchar(64) DEFAULT NULL,
+`argument` mediumtext
+) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='General log';
+CREATE TABLE `slow_log` (
+`start_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP
+ON UPDATE CURRENT_TIMESTAMP,
+`user_host` mediumtext NOT NULL,
+`query_time` time NOT NULL,
+`lock_time` time NOT NULL,
+`rows_sent` int(11) NOT NULL,
+`rows_examined` int(11) NOT NULL,
+`db` varchar(512) DEFAULT NULL,
+`last_insert_id` int(11) DEFAULT NULL,
+`insert_id` int(11) DEFAULT NULL,
+`server_id` int(11) DEFAULT NULL,
+`sql_text` mediumtext NOT NULL
+) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='Slow log';
+set global general_log='ON';
+set global slow_query_log='ON';
+use test;
+flush tables with read lock;
+unlock tables;
+use mysql;
+lock tables general_log read local, help_category read local;
+unlock tables;
diff --git a/mysql-test/t/log_tables.test b/mysql-test/t/log_tables.test
index 5b79e5e4625..97c83310b4d 100644
--- a/mysql-test/t/log_tables.test
+++ b/mysql-test/t/log_tables.test
@@ -171,6 +171,149 @@ select sleep(2);
 --replace_column 1 TIMESTAMP 2 USER_HOST 3 QUERY_TIME
 select * from mysql.slow_log;
 
+#
+# Bug #18559 log tables cannot change engine, and gets deadlocked when
+# dropping w/ log on
+#
+
+# check that appropriate error messages are given when one attempts to alter
+# or drop a log tables, while corresponding logs are enabled
+--error ER_CANT_ALTER_LOG_TABLE
+alter table mysql.general_log engine=myisam;
+--error ER_CANT_ALTER_LOG_TABLE
+alter table mysql.slow_log engine=myisam;
+
+--error ER_CANT_DROP_LOG_TABLE
+drop table mysql.general_log;
+--error ER_CANT_DROP_LOG_TABLE
+drop table mysql.slow_log;
+
+# check that one can alter log tables to MyISAM
+set global general_log='OFF';
+
+# cannot convert another log table
+--error ER_CANT_ALTER_LOG_TABLE
+alter table mysql.slow_log engine=myisam;
+
+# alter both tables
+set global slow_query_log='OFF';
+# check that both tables use CSV engine
+show create table mysql.general_log;
+show create table mysql.slow_log;
+
+alter table mysql.general_log engine=myisam;
+alter table mysql.slow_log engine=myisam;
+
+# check that the tables were converted
+show create table mysql.general_log;
+show create table mysql.slow_log;
+
+# enable log tables and chek that new tables indeed work
+set global general_log='ON';
+set global slow_query_log='ON';
+
+--replace_column 1 TIMESTAMP 2 USER_HOST 3 THREAD_ID
+select * from mysql.general_log;
+
+# check that flush of myisam-based log tables work fine
+flush logs;
+
+# check locking of myisam-based log tables
+
+--error ER_CANT_WRITE_LOCK_LOG_TABLE
+lock tables mysql.general_log WRITE;
+
+--error ER_CANT_WRITE_LOCK_LOG_TABLE
+lock tables mysql.slow_log WRITE;
+
+#
+# This attemts to get TL_READ_NO_INSERT lock, which is incompatible with
+# TL_WRITE_CONCURRENT_INSERT. This should fail. We issue this error as log
+# tables are always opened and locked by the logger.
+#
+
+--error ER_CANT_READ_LOCK_LOG_TABLE
+lock tables mysql.general_log READ;
+
+--error ER_CANT_READ_LOCK_LOG_TABLE
+lock tables mysql.slow_log READ;
+
+#
+# This call should result in TL_READ lock on the log table. This is ok and
+# should pass.
+#
+
+lock tables mysql.slow_log READ LOCAL, mysql.general_log READ LOCAL;
+
+unlock tables;
+
+# check that we can drop them
+set global general_log='OFF';
+set global slow_query_log='OFF';
+
+# check that alter table doesn't work for other engines
+--error ER_BAD_LOG_ENGINE
+alter table mysql.slow_log engine=ndb;
+--error ER_BAD_LOG_ENGINE
+alter table mysql.slow_log engine=innodb;
+--error ER_BAD_LOG_ENGINE
+alter table mysql.slow_log engine=archive;
+--error ER_BAD_LOG_ENGINE
+alter table mysql.slow_log engine=blackhole;
+
+drop table mysql.slow_log;
+drop table mysql.general_log;
+
+# check that table share cleanup is performed correctly (double drop)
+
+--error ER_BAD_TABLE_ERROR
+drop table mysql.general_log;
+--error ER_BAD_TABLE_ERROR
+drop table mysql.slow_log;
+
+# recreate tables and enable logs
+
+use mysql;
+
+CREATE TABLE `general_log` (
+  `event_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP
+                         ON UPDATE CURRENT_TIMESTAMP,
+  `user_host` mediumtext,
+  `thread_id` int(11) DEFAULT NULL,
+  `server_id` int(11) DEFAULT NULL,
+  `command_type` varchar(64) DEFAULT NULL,
+  `argument` mediumtext
+) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='General log';
+
+CREATE TABLE `slow_log` (
+  `start_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP
+                         ON UPDATE CURRENT_TIMESTAMP,
+  `user_host` mediumtext NOT NULL,
+  `query_time` time NOT NULL,
+  `lock_time` time NOT NULL,
+  `rows_sent` int(11) NOT NULL,
+  `rows_examined` int(11) NOT NULL,
+  `db` varchar(512) DEFAULT NULL,
+  `last_insert_id` int(11) DEFAULT NULL,
+  `insert_id` int(11) DEFAULT NULL,
+  `server_id` int(11) DEFAULT NULL,
+  `sql_text` mediumtext NOT NULL
+) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='Slow log';
+
+set global general_log='ON';
+set global slow_query_log='ON';
+use test;
+
+#
+# Bug #20139 Infinite loop after "FLUSH" and "LOCK tabX, general_log"
+#
+
+flush tables with read lock;
+unlock tables;
+use mysql;
+lock tables general_log read local, help_category read local;
+unlock tables;
+
 # kill all connections
 disconnect con1;
 disconnect con2;
diff --git a/sql/ha_myisam.cc b/sql/ha_myisam.cc
index 2acc1f4ed7d..565010a1889 100644
--- a/sql/ha_myisam.cc
+++ b/sql/ha_myisam.cc
@@ -274,6 +274,15 @@ bool ha_myisam::check_if_locking_is_allowed(uint sql_command,
              table->s->table_name.str);
     return FALSE;
   }
+
+  /*
+    Deny locking of the log tables, which is incompatible with
+    concurrent insert. Unless called from a logger THD:
+    general_log_thd or slow_log_thd.
+  */
+  if (!called_by_logger_thread)
+    return check_if_log_table_locking_is_allowed(sql_command, type, table);
+
   return TRUE;
 }
 
diff --git a/sql/handler.cc b/sql/handler.cc
index 0804f23f51e..fbccfe7fa46 100644
--- a/sql/handler.cc
+++ b/sql/handler.cc
@@ -1423,6 +1423,34 @@ void handler::ha_statistic_increment(ulong SSV::*offset) const
   statistic_increment(table->in_use->status_var.*offset, &LOCK_status);
 }
 
+
+bool handler::check_if_log_table_locking_is_allowed(uint sql_command,
+                                                    ulong type, TABLE *table)
+{
+  /*
+    Deny locking of the log tables, which is incompatible with
+    concurrent insert. Unless called from a logger THD:
+    general_log_thd or slow_log_thd.
+  */
+  if (table->s->log_table &&
+      sql_command != SQLCOM_TRUNCATE &&
+      sql_command != SQLCOM_ALTER_TABLE &&
+      !(sql_command == SQLCOM_FLUSH &&
+        type & REFRESH_LOG) &&
+      (table->reginfo.lock_type >= TL_READ_NO_INSERT))
+  {
+    /*
+      The check  >= TL_READ_NO_INSERT denies all write locks
+      plus the only read lock (TL_READ_NO_INSERT itself)
+    */
+    table->reginfo.lock_type == TL_READ_NO_INSERT ?
+      my_error(ER_CANT_READ_LOCK_LOG_TABLE, MYF(0)) :
+        my_error(ER_CANT_WRITE_LOCK_LOG_TABLE, MYF(0));
+    return FALSE;
+  }
+  return TRUE;
+}
+
 /*
   Open database-handler.
 
diff --git a/sql/handler.h b/sql/handler.h
index ddcd6f860a7..201a2f1980a 100644
--- a/sql/handler.h
+++ b/sql/handler.h
@@ -974,6 +974,8 @@ public:
   {
     return TRUE;
   }
+  bool check_if_log_table_locking_is_allowed(uint sql_command,
+                                             ulong type, TABLE *table);
   int ha_open(TABLE *table, const char *name, int mode, int test_if_locked);
   void adjust_next_insert_id_after_explicit_value(ulonglong nr);
   bool update_auto_increment();
diff --git a/sql/log.cc b/sql/log.cc
index dba4b65efd9..b93d36cf630 100644
--- a/sql/log.cc
+++ b/sql/log.cc
@@ -1106,15 +1106,16 @@ void Log_to_csv_event_handler::
   THD *log_thd, *curr= current_thd;
   TABLE_LIST *table;
 
-  if (!logger.is_log_tables_initialized)
-    return;                                     /* do nothing */
-
   switch (log_table_type) {
   case QUERY_LOG_GENERAL:
+    if (!logger.is_general_log_table_enabled())
+      return;                                     /* do nothing */
     log_thd= general_log_thd;
     table= &general_log;
     break;
   case QUERY_LOG_SLOW:
+    if (!logger.is_slow_log_table_enabled())
+      return;                                     /* do nothing */
     log_thd= slow_log_thd;
     table= &slow_log;
     break;
diff --git a/sql/log.h b/sql/log.h
index b4818a370d7..d598952a853 100644
--- a/sql/log.h
+++ b/sql/log.h
@@ -497,6 +497,14 @@ public:
   {}
   void lock() { (void) pthread_mutex_lock(&LOCK_logger); }
   void unlock() { (void) pthread_mutex_unlock(&LOCK_logger); }
+  bool is_general_log_table_enabled()
+  {
+    return table_log_handler && table_log_handler->general_log.table != 0;
+  }
+  bool is_slow_log_table_enabled()
+  {
+    return table_log_handler && table_log_handler->slow_log.table != 0;
+  }
   /*
     We want to initialize all log mutexes as soon as possible,
     but we cannot do it in constructor, as safe_mutex relies on
diff --git a/sql/mysqld.cc b/sql/mysqld.cc
index a8fcee4cce3..087613c6b7c 100644
--- a/sql/mysqld.cc
+++ b/sql/mysqld.cc
@@ -2771,6 +2771,19 @@ static int init_common_variables(const char *conf_file_name, int argc,
   else
     sys_init_slave.value=my_strdup("",MYF(0));
 
+  /* check log options and issue warnings if needed */
+  if (opt_log && opt_logname && !(log_output_options & LOG_FILE) &&
+      !(log_output_options & LOG_NONE))
+    sql_print_warning("Although a path was specified for the "
+                      "--log option, log tables are used. "
+                      "To enable logging to file use the --log-output option.");
+
+  if (opt_slow_log && opt_slow_logname && !(log_output_options & LOG_FILE)
+      && !(log_output_options & LOG_NONE))
+    sql_print_warning("Although a path was specified for the "
+                      "--log-slow-queries option, log tables are used. "
+                      "To enable logging to file use the --log-output option.");
+
   if (!opt_logname)
     opt_logname= make_default_log_name(buff, ".log");
   sys_var_general_log_path.value= my_strdup(opt_logname, MYF(0));
diff --git a/sql/share/errmsg.txt b/sql/share/errmsg.txt
index a5fefc38c59..64cf018e03b 100644
--- a/sql/share/errmsg.txt
+++ b/sql/share/errmsg.txt
@@ -5843,3 +5843,9 @@ ER_RBR_NOT_AVAILABLE
         eng "The server was not built with row-based replication"
 ER_NO_TRIGGERS_ON_SYSTEM_SCHEMA
 	eng "Triggers can not be created on system tables"
+ER_CANT_ALTER_LOG_TABLE
+        eng "You can't alter a log table if logging is enabled"
+ER_BAD_LOG_ENGINE
+        eng "One can use only CSV and MyISAM engines for the log tables"
+ER_CANT_DROP_LOG_TABLE
+        eng "Cannot drop log table if log is enabled"
diff --git a/sql/sql_base.cc b/sql/sql_base.cc
index e40b9721911..dbe7f5b5083 100644
--- a/sql/sql_base.cc
+++ b/sql/sql_base.cc
@@ -1997,17 +1997,17 @@ TABLE *open_table(THD *thd, TABLE_LIST *table_list, MEM_ROOT *mem_root,
        table= (TABLE*) hash_next(&open_cache, (byte*) key, key_length,
                                  &state))
   {
-    if (table->s->version != refresh_version)
+    /*
+      Here we flush tables marked for flush. However we never flush log
+      tables here. They are flushed only on FLUSH LOGS.
+    */
+    if (table->s->version != refresh_version && !table->s->log_table)
     {
       DBUG_PRINT("note",
                  ("Found table '%s.%s' with different refresh version",
                   table_list->db, table_list->table_name));
 
-      /*
-        Don't close tables if we are working with a log table or were
-        asked not to close the table explicitly
-      */
-      if (flags & MYSQL_LOCK_IGNORE_FLUSH || table->s->log_table)
+      if (flags & MYSQL_LOCK_IGNORE_FLUSH)
       {
         /* Force close at once after usage */
         thd->version= table->s->version;
@@ -2346,7 +2346,11 @@ void close_old_data_files(THD *thd, TABLE *table, bool abort_locks,
 
   for (; table ; table=table->next)
   {
-    if (table->s->version != refresh_version)
+    /*
+      Reopen marked for flush. But close log tables. They are flushed only
+      explicitly on FLUSH LOGS
+    */
+    if (table->s->version != refresh_version && !table->s->log_table)
     {
       found=1;
       if (table->db_stat)
diff --git a/sql/sql_table.cc b/sql/sql_table.cc
index 945fac83ff2..5325758fd12 100644
--- a/sql/sql_table.cc
+++ b/sql/sql_table.cc
@@ -1537,6 +1537,18 @@ int mysql_rm_table_part2(THD *thd, TABLE_LIST *tables, bool if_exists,
     table->db_type= NULL;
     if ((share= get_cached_table_share(table->db, table->table_name)))
       table->db_type= share->db_type;
+
+    /* Disable drop of enabled log tables */
+    if (share && share->log_table &&
+        ((!my_strcasecmp(system_charset_info, table->table_name,
+                         "general_log") && opt_log &&
+          logger.is_general_log_table_enabled()) ||
+         (!my_strcasecmp(system_charset_info, table->table_name, "slow_log")
+          && opt_slow_log && logger.is_slow_log_table_enabled())))
+    {
+      my_error(ER_CANT_DROP_LOG_TABLE, MYF(0));
+      DBUG_RETURN(1);
+    }
   }
 
   if (lock_table_names(thd, tables))
@@ -5003,6 +5015,43 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
   LINT_INIT(index_add_buffer);
   LINT_INIT(index_drop_buffer);
 
+  if (table_list && table_list->db &&
+      !my_strcasecmp(system_charset_info, table_list->db, "mysql") &&
+      table_list->table_name)
+  {
+    enum enum_table_kind { NOT_LOG_TABLE= 1, GENERAL_LOG, SLOW_LOG }
+         table_kind= NOT_LOG_TABLE;
+
+    if (!my_strcasecmp(system_charset_info, table_list->table_name,
+                       "general_log"))
+      table_kind= GENERAL_LOG;
+    else
+      if (!my_strcasecmp(system_charset_info, table_list->table_name,
+                         "slow_log"))
+        table_kind= SLOW_LOG;
+
+    /* Disable alter of enabled log tables */
+    if ((table_kind == GENERAL_LOG && opt_log &&
+        logger.is_general_log_table_enabled()) ||
+       (table_kind == SLOW_LOG && opt_slow_log &&
+         logger.is_slow_log_table_enabled()))
+    {
+      my_error(ER_CANT_ALTER_LOG_TABLE, MYF(0));
+      DBUG_RETURN(TRUE);
+    }
+
+    /* Disable alter of log tables to unsupported engine */
+    if ((table_kind == GENERAL_LOG || table_kind == SLOW_LOG) &&
+        (lex_create_info->used_fields & HA_CREATE_USED_ENGINE) &&
+        (!lex_create_info->db_type || /* unknown engine */
+        !(lex_create_info->db_type->db_type == DB_TYPE_MYISAM ||
+          lex_create_info->db_type->db_type == DB_TYPE_CSV_DB)))
+    {
+      my_error(ER_BAD_LOG_ENGINE, MYF(0));
+      DBUG_RETURN(TRUE);
+    }
+  }
+
   thd->proc_info="init";
   if (!(create_info= copy_create_info(lex_create_info)))
   {
diff --git a/storage/csv/ha_tina.cc b/storage/csv/ha_tina.cc
index 6bd8447720c..1b5098a7519 100644
--- a/storage/csv/ha_tina.cc
+++ b/storage/csv/ha_tina.cc
@@ -817,27 +817,9 @@ bool ha_tina::check_if_locking_is_allowed(uint sql_command,
                                           uint count,
                                           bool called_by_logger_thread)
 {
-  /*
-    Deny locking of the log tables, which is incompatible with
-    concurrent insert. Unless called from a logger THD:
-    general_log_thd or slow_log_thd.
-  */
-  if (table->s->log_table &&
-      sql_command != SQLCOM_TRUNCATE &&
-      !(sql_command == SQLCOM_FLUSH &&
-        type & REFRESH_LOG) &&
-      !called_by_logger_thread &&
-      (table->reginfo.lock_type >= TL_READ_NO_INSERT))
-  {
-    /*
-      The check  >= TL_READ_NO_INSERT denies all write locks
-      plus the only read lock (TL_READ_NO_INSERT itself)
-    */
-    table->reginfo.lock_type == TL_READ_NO_INSERT ?
-      my_error(ER_CANT_READ_LOCK_LOG_TABLE, MYF(0)) :
-        my_error(ER_CANT_WRITE_LOCK_LOG_TABLE, MYF(0));
-    return FALSE;
-  }
+  if (!called_by_logger_thread)
+    return check_if_log_table_locking_is_allowed(sql_command, type, table);
+
   return TRUE;
 }
 
diff --git a/storage/myisam/mi_extra.c b/storage/myisam/mi_extra.c
index c1ed29c4734..93fe4ed5d52 100644
--- a/storage/myisam/mi_extra.c
+++ b/storage/myisam/mi_extra.c
@@ -366,6 +366,11 @@ int mi_extra(MI_INFO *info, enum ha_extra_function function, void *extra_arg)
     pthread_mutex_unlock(&share->intern_lock);
 #endif
     break;
+  case HA_EXTRA_MARK_AS_LOG_TABLE:
+    pthread_mutex_lock(&share->intern_lock);
+    share->is_log_table= TRUE;
+    pthread_mutex_unlock(&share->intern_lock);
+    break;
   case HA_EXTRA_KEY_CACHE:
   case HA_EXTRA_NO_KEY_CACHE:
   default:
diff --git a/storage/myisam/mi_open.c b/storage/myisam/mi_open.c
index b61c1af24da..1675c596860 100644
--- a/storage/myisam/mi_open.c
+++ b/storage/myisam/mi_open.c
@@ -489,6 +489,7 @@ MI_INFO *mi_open(const char *name, int mode, uint open_flags)
       share->data_file_type = DYNAMIC_RECORD;
     my_afree((gptr) disk_cache);
     mi_setup_functions(share);
+    share->is_log_table= FALSE;
 #ifdef THREAD
     thr_lock_init(&share->lock);
     VOID(pthread_mutex_init(&share->intern_lock,MY_MUTEX_INIT_FAST));
diff --git a/storage/myisam/mi_write.c b/storage/myisam/mi_write.c
index 9ab8753f6d7..f16d9471afe 100644
--- a/storage/myisam/mi_write.c
+++ b/storage/myisam/mi_write.c
@@ -163,6 +163,18 @@ int mi_write(MI_INFO *info, byte *record)
     (*info->invalidator)(info->filename);
     info->invalidator=0;
   }
+
+  /*
+    Update status of the table. We need to do so after each row write
+    for the log tables, as we want the new row to become visible to
+    other threads as soon as possible. We lock mutex here to follow
+    pthread memory visibility rules.
+  */
+  pthread_mutex_lock(&share->intern_lock);
+  if (share->is_log_table)
+    mi_update_status((void*) info);
+  pthread_mutex_unlock(&share->intern_lock);
+
   allow_break();				/* Allow SIGHUP & SIGINT */
   DBUG_RETURN(0);
 
diff --git a/storage/myisam/myisamdef.h b/storage/myisam/myisamdef.h
index baab34b4b67..765e26dc74d 100644
--- a/storage/myisam/myisamdef.h
+++ b/storage/myisam/myisamdef.h
@@ -201,6 +201,9 @@ typedef struct st_mi_isam_share {	/* Shared between opens */
   uint	blocksize;			/* blocksize of keyfile */
   myf write_flag;
   enum data_file_type data_file_type;
+  /* Below flag is needed to make log tables work with concurrent insert */
+  my_bool is_log_table;
+
   my_bool  changed,			/* If changed since lock */
     global_changed,			/* If changed since open */
     not_flushed,