mdl_sync now works.

mysql-test/r/mdl_sync.result:
  Full merge with 5.6
mysql-test/t/mdl_sync.test:
  Full merge with 5.6
sql/debug_sync.cc:
  Full merge with 5.6
sql/debug_sync.h:
  Full merge with 5.6
sql/mdl.cc:
  Full merge with 5.6
sql/sql_base.cc:
  Removed code not in 5.6 anymore

mysql-test/r/ctype_utf8.result

@@ -1229,7 +1229,7 @@ DROP TABLE t1;
 SET NAMES utf8;
 DROP TABLE IF EXISTS t1;
 Warnings:
-Note	1051	Unknown table 't1'
+Note	1051	Unknown table 'test.t1'
 CREATE TABLE t1(a VARCHAR(255), KEY(a)) ENGINE=MyISAM DEFAULT CHARSET=utf8;
 INSERT INTO t1 VALUES('uuABCDEFGHIGKLMNOPRSTUVWXYZ̈bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb');
 INSERT INTO t1 VALUES('uu');

mysql-test/r/ctype_utf8mb4.result

@@ -1256,7 +1256,7 @@ DROP TABLE t1;
 SET NAMES utf8mb4;
 DROP TABLE IF EXISTS t1;
 Warnings:
-Note	1051	Unknown table 't1'
+Note	1051	Unknown table 'test.t1'
 CREATE TABLE t1(a VARCHAR(255), KEY(a)) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4;
 Warnings:
 Warning	1071	Specified key was too long; max key length is 1000 bytes

mysql-test/r/ctype_utf8mb4_innodb.result

@@ -1231,7 +1231,7 @@ DROP TABLE t1;
 SET NAMES utf8mb4;
 DROP TABLE IF EXISTS t1;
 Warnings:
-Note	1051	Unknown table 't1'
+Note	1051	Unknown table 'test.t1'
 CREATE TABLE t1(a VARCHAR(255), KEY(a)) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 Warnings:
 Warning	1071	Specified key was too long; max key length is 767 bytes

sql/debug_sync.cc

-/* Copyright (c) 2009, 2010, Oracle and/or its affiliates.
+/* Copyright (c) 2009, 2011, Oracle and/or its affiliates.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -10,8 +10,8 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
+   along with this program; if not, write to the Free Software Foundation,
+   51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
 
 /* see include/mysql/service_debug_sync.h for debug sync documentation */
 
@@ -82,8 +82,6 @@ struct st_debug_sync_globals
 };
 static st_debug_sync_globals debug_sync_global; /* All globals in one object */
 
-extern uint opt_debug_sync_timeout;
-
 /**
   Callbacks from C files.
 */
@@ -112,14 +110,11 @@ static void init_debug_sync_psi_keys(void)
   const char* category= "sql";
   int count;
 
-  if (PSI_server == NULL)
-    return;
-
   count= array_elements(all_debug_sync_mutexes);
-  PSI_server->register_mutex(category, all_debug_sync_mutexes, count);
+  mysql_mutex_register(category, all_debug_sync_mutexes, count);
 
   count= array_elements(all_debug_sync_conds);
-  PSI_server->register_cond(category, all_debug_sync_conds, count);
+  mysql_cond_register(category, all_debug_sync_conds, count);
 }
 #endif /* HAVE_PSI_INTERFACE */
 
@@ -783,7 +778,7 @@ static bool debug_sync_set_action(THD *thd, st_debug_sync_action *action)
       point decremented it to 0. In this case the following happened:
 
       - an error message was reported with my_error() and
-      - the statement was killed with thd->killed= KILL_QUERY.
+      - the statement was killed with thd->killed= THD::KILL_QUERY.
 
       If a statement reports an error, it must not call send_ok().
       The calling functions will not call send_ok(), if we return TRUE
@@ -985,7 +980,7 @@ static bool debug_sync_eval_action(THD *thd, char *action_str)
   DBUG_ENTER("debug_sync_eval_action");
   DBUG_ASSERT(thd);
   DBUG_ASSERT(action_str);
-  DBUG_PRINT("debug_sync", ("action_str='%s'", action_str));
+  DBUG_PRINT("debug_sync", ("action_str: '%s'", action_str));
 
   /*
     Get debug sync point name. Or a special command.
@@ -1450,8 +1445,13 @@ static void debug_sync_execute(THD *thd, st_debug_sync_action *action)
                         sig_wait, sig_glob, error));});
         if (error == ETIMEDOUT || error == ETIME)
         {
+          // We should not make the statement fail, even if in strict mode.
+          const bool save_abort_on_warning= thd->abort_on_warning;
+          thd->abort_on_warning= false;
           push_warning(thd, Sql_condition::WARN_LEVEL_WARN,
                        ER_DEBUG_SYNC_TIMEOUT, ER(ER_DEBUG_SYNC_TIMEOUT));
+          thd->abort_on_warning= save_abort_on_warning;
+          DBUG_EXECUTE_IF("debug_sync_abort_on_timeout", DBUG_ABORT(););
           break;
         }
         error= 0;

sql/debug_sync.h

@@ -32,6 +32,9 @@ class THD;
 
 #if defined(ENABLED_DEBUG_SYNC)
 
+/* Command line option --debug-sync-timeout. See mysqld.cc. */
+extern MYSQL_PLUGIN_IMPORT uint opt_debug_sync_timeout;
+
 /* Default WAIT_FOR timeout if command line option is given without argument. */
 #define DEBUG_SYNC_DEFAULT_WAIT_TIMEOUT 300
 

sql/mdl.cc

@@ -1872,6 +1872,8 @@ MDL_context::find_ticket(MDL_request *mdl_request,
       if (mdl_request->key.is_equal(&ticket->m_lock->key) &&
           ticket->has_stronger_or_equal_type(mdl_request->type))
       {
+        DBUG_PRINT("info", ("Adding mdl lock %d to %d",
+                            mdl_request->type, ticket->m_type));
         *result_duration= duration;
         return ticket;
       }
@@ -2168,6 +2170,7 @@ MDL_context::acquire_lock(MDL_request *mdl_request, ulong lock_wait_timeout)
   struct timespec abs_timeout;
   MDL_wait::enum_wait_status wait_status;
   DBUG_ENTER("MDL_context::acquire_lock");
+  DBUG_PRINT("enter", ("lock_type: %d", mdl_request->type));
 
   /* Do some work outside the critical section. */
   set_timespec(abs_timeout, lock_wait_timeout);
@@ -2182,6 +2185,7 @@ MDL_context::acquire_lock(MDL_request *mdl_request, ulong lock_wait_timeout)
       MDL_lock, MDL_context and MDL_request were updated
       accordingly, so we can simply return success.
     */
+    DBUG_PRINT("info", ("Got lock without waiting"));
     DBUG_RETURN(FALSE);
   }
 
@@ -2393,8 +2397,9 @@ MDL_context::upgrade_shared_lock(MDL_ticket *mdl_ticket,
   MDL_request mdl_xlock_request;
   MDL_savepoint mdl_svp= mdl_savepoint();
   bool is_new_ticket;
-
   DBUG_ENTER("MDL_context::upgrade_shared_lock");
+  DBUG_PRINT("enter",("new_type: %d  lock_wait_timeout: %lu", new_type,
+                      lock_wait_timeout));
   DEBUG_SYNC(get_thd(), "mdl_upgrade_lock");
 
   /*
@@ -2701,8 +2706,8 @@ void MDL_context::release_lock(enum_mdl_duration duration, MDL_ticket *ticket)
 {
   MDL_lock *lock= ticket->m_lock;
   DBUG_ENTER("MDL_context::release_lock");
-  DBUG_PRINT("enter", ("db=%s name=%s", lock->key.db_name(),
-                                        lock->key.name()));
+  DBUG_PRINT("enter", ("db: '%s' name: '%s'",
+                       lock->key.db_name(), lock->key.name()));
 
   DBUG_ASSERT(this == ticket->get_ctx());
   mysql_mutex_assert_not_owner(&LOCK_open);

sql/sql_base.cc

@@ -2952,7 +2952,7 @@ bool open_table(THD *thd, TABLE_LIST *table_list, MEM_ROOT *mem_root,
     }
     /*
       No table in the locked tables list. In case of explicit LOCK TABLES
-      this can happen if a user did not include the able into the list.
+      this can happen if a user did not include the table into the list.
       In case of pre-locked mode locked tables list is generated automatically,
       so we may only end up here if the table did not exist when
       locked tables list was created.
@@ -2971,19 +2971,6 @@ bool open_table(THD *thd, TABLE_LIST *table_list, MEM_ROOT *mem_root,
 
   if (! (flags & MYSQL_OPEN_HAS_MDL_LOCK))
   {
-    /*
-      Check if we're trying to take a write lock in a read only transaction.
-    */
-    if (table_list->mdl_request.type >= MDL_SHARED_WRITE &&
-        thd->tx_read_only &&
-        !(flags & (MYSQL_OPEN_HAS_MDL_LOCK |
-                   MYSQL_LOCK_LOG_TABLE    |
-                   MYSQL_LOCK_IGNORE_GLOBAL_READ_ONLY)))
-    {
-      my_error(ER_CANT_EXECUTE_IN_READ_ONLY_TRANSACTION, MYF(0));
-      DBUG_RETURN(true);
-    }
-
     /*
       We are not under LOCK TABLES and going to acquire write-lock/
       modify the base table. We need to acquire protection against

sql/sql_table.cc

@@ -2221,9 +2221,10 @@ int mysql_rm_table_no_locks(THD *thd, TABLE_LIST *tables, bool if_exists,
                             bool dont_log_query)
 {
   TABLE_LIST *table;
-  char path[FN_REFLEN + 1], *alias= NULL;
+  char path[FN_REFLEN + 1], wrong_tables_buff[160], *alias= NULL;
+  String wrong_tables(wrong_tables_buff, sizeof(wrong_tables_buff)-1,
+                      system_charset_info);
   uint path_length= 0;
-  String wrong_tables;
   int error= 0;
   int non_temp_tables_count= 0;
   bool foreign_key_error=0;
@@ -2234,6 +2235,7 @@ int mysql_rm_table_no_locks(THD *thd, TABLE_LIST *tables, bool if_exists,
   String built_trans_tmp_query, built_non_trans_tmp_query;
   DBUG_ENTER("mysql_rm_table_no_locks");
 
+  wrong_tables.length(0);
   /*
     Prepares the drop statements that will be written into the binary
     log as follows:
@@ -2453,9 +2455,17 @@ int mysql_rm_table_no_locks(THD *thd, TABLE_LIST *tables, bool if_exists,
           . ./sql/datadict.cc +32 /Alfranio - TODO: We need to test this.
       */
       if (if_exists)
+      {
+        char buff[FN_REFLEN];
+        String tbl_name(buff, sizeof(buff), system_charset_info);
+        tbl_name.length(0);
+        tbl_name.append(db);
+        tbl_name.append('.');
+        tbl_name.append(table->table_name);
         push_warning_printf(thd, Sql_condition::WARN_LEVEL_NOTE,
                             ER_BAD_TABLE_ERROR, ER(ER_BAD_TABLE_ERROR),
-			    table->table_name);
+                            tbl_name.c_ptr_safe());
+      }
       else
       {
         non_tmp_error = (drop_temporary ? non_tmp_error : TRUE);
@@ -2513,7 +2523,9 @@ int mysql_rm_table_no_locks(THD *thd, TABLE_LIST *tables, bool if_exists,
     {
       if (wrong_tables.length())
 	wrong_tables.append(',');
-      wrong_tables.append(String(table->table_name,system_charset_info));
+      wrong_tables.append(db);
+      wrong_tables.append('.');
+      wrong_tables.append(table->table_name);
     }
     DBUG_PRINT("table", ("table: 0x%lx  s: 0x%lx", (long) table->table,
                          table->table ? (long) table->table->s : (long) -1));

sql/table.cc

@@ -998,10 +998,15 @@ static int open_binary_frm(THD *thd, TABLE_SHARE *share, uchar *head,
       }
       key_part->store_length=key_part->length;
     }
+
+    /*
+      Add primary key to end of extended keys for non unique keys for
+      storage engines that supports it.
+    */
     keyinfo->ext_key_parts= keyinfo->user_defined_key_parts;
     keyinfo->ext_key_flags= keyinfo->flags;
     keyinfo->ext_key_part_map= 0;
-    if (share->use_ext_keys && i)
+    if (share->use_ext_keys && i && !(keyinfo->flags & HA_NOSAME))
     {
       keyinfo->ext_key_part_map= 0;
       for (j= 0; 

storage/myisammrg/ha_myisammrg.cc

@@ -512,7 +512,7 @@ int ha_myisammrg::add_children_list(void)
       DDL on implicitly locked underlying tables of a MERGE table.
     */
     if (! thd->locked_tables_mode &&
-        parent_l->mdl_request.type == MDL_SHARED_NO_WRITE)
+        parent_l->mdl_request.type == MDL_SHARED_UPGRADABLE)
       child_l->mdl_request.set_type(MDL_SHARED_NO_WRITE);
     /* Link TABLE_LIST object into the children list. */
     if (this->children_last_l)
@@ -1372,8 +1372,6 @@ int ha_myisammrg::reset(void)
 int ha_myisammrg::extra_opt(enum ha_extra_function operation, ulong cache_size)
 {
   DBUG_ASSERT(this->file->children_attached);
-  if ((specialflag & SPECIAL_SAFE_MODE) && operation == HA_EXTRA_WRITE_CACHE)
-    return 0;
   return myrg_extra(file, operation, (void*) &cache_size);
 }