Bug #31868 mysql_server_init crash when language path is not correctly set.

When mysql_server_init() interrupts on some error (wrong errmsg file
for example) in the middle of it's execution, it doesn't call
execute_ddl_log_recovery() so LOCK_gdl mutex isn't init-ed.
In this case we shouldn't execute release_ddl_log during cleanup
as it uses that mutex inside.

.bzrignore

@@ -3004,3 +3004,7 @@ win/vs71cache.txt
 win/vs8cache.txt
 zlib/*.ds?
 zlib/*.vcproj
+libmysqld/scheduler.cc
+libmysqld/sql_connect.cc
+libmysqld/sql_tablespace.cc
+libmysql_r/client_settings.h

libmysqld/lib_sql.cc

@@ -551,7 +551,6 @@ void end_embedded_server()
 {
   my_free((char*) copy_arguments_ptr, MYF(MY_ALLOW_ZERO_PTR));
   copy_arguments_ptr=0;
-  release_ddl_log();
   clean_up(0);
 }
 

sql/mysqld.cc

@@ -1164,6 +1164,8 @@ void clean_up(bool print_message)
   if (cleanup_done++)
     return; /* purecov: inspected */
 
+  release_ddl_log();
+
   /*
     make sure that handlers finish up
     what they have that is dependent on the binlog
@@ -3995,7 +3997,6 @@ we force server id to 2, but this MySQL server will not act as a slave.");
     pthread_cond_wait(&COND_thread_count,&LOCK_thread_count);
   (void) pthread_mutex_unlock(&LOCK_thread_count);
 
-  release_ddl_log();
 #if defined(__WIN__) && !defined(EMBEDDED_LIBRARY)
   if (Service.IsNT() && start_mode)
     Service.Stop();

sql/sql_table.cc

@@ -279,7 +279,7 @@ uint build_tmptable_filename(THD* thd, char *buff, size_t bufflen)
 */
 
 
-typedef struct st_global_ddl_log
+struct st_global_ddl_log
 {
   /*
     We need to adjust buffer size to be able to handle downgrades/upgrades
@@ -297,10 +297,12 @@ typedef struct st_global_ddl_log
   uint name_len;
   uint io_size;
   bool inited;
+  bool do_release;
   bool recovery_phase;
-} GLOBAL_DDL_LOG;
+  st_global_ddl_log() : inited(false), do_release(false) {}
+};
 
-GLOBAL_DDL_LOG global_ddl_log;
+st_global_ddl_log global_ddl_log;
 
 pthread_mutex_t LOCK_gdl;
 
@@ -460,6 +462,7 @@ static uint read_ddl_log_header()
   global_ddl_log.first_used= NULL;
   global_ddl_log.num_entries= 0;
   VOID(pthread_mutex_init(&LOCK_gdl, MY_MUTEX_INIT_FAST));
+  global_ddl_log.do_release= true;
   DBUG_RETURN(entry_no);
 }
 
@@ -1150,6 +1153,9 @@ void release_ddl_log()
   DDL_LOG_MEMORY_ENTRY *used_list= global_ddl_log.first_used;
   DBUG_ENTER("release_ddl_log");
 
+  if (!global_ddl_log.do_release)
+    DBUG_VOID_RETURN;
+
   pthread_mutex_lock(&LOCK_gdl);
   while (used_list)
   {
@@ -1167,6 +1173,7 @@ void release_ddl_log()
   global_ddl_log.inited= 0;
   pthread_mutex_unlock(&LOCK_gdl);
   VOID(pthread_mutex_destroy(&LOCK_gdl));
+  global_ddl_log.do_release= false;
   DBUG_VOID_RETURN;
 }