diff -wbBdu -u --recursive /s/src/mysql-5.1.47/sql/sql_base.cc sql/sql_base.cc
--- /s/src/mysql-5.1.47/sql/sql_base.cc	2010-05-06 08:27:31.000000000 -0700
+++ sql/sql_base.cc	2011-03-28 13:22:39.000000000 -0700
@@ -2187,6 +2187,10 @@
     mutex is unlocked
   */
     
+fprintf(stderr, "sleeping in wait_for_condition\n");
+my_sleep(15000000);
+fprintf(stderr, "done sleeping in wait_for_condition\n");
+    
   pthread_mutex_unlock(mutex);
   pthread_mutex_lock(&thd->mysys_var->mutex);
   thd->mysys_var->current_mutex= 0;
@@ -2839,7 +2843,9 @@
       if (table->in_use != thd)
       {
         /* wait_for_conditionwill unlock LOCK_open for us */
+fprintf(stderr, "start wait_for_cond\n");
         wait_for_condition(thd, &LOCK_open, &COND_refresh);
+fprintf(stderr, "stop wait_for_cond\n");
       }
       else
       {
diff -wbBdu -u --recursive /s/src/mysql-5.1.47/sql/sql_class.cc sql/sql_class.cc
--- /s/src/mysql-5.1.47/sql/sql_class.cc	2010-05-06 08:27:31.000000000 -0700
+++ sql/sql_class.cc	2011-03-28 13:13:50.000000000 -0700
@@ -407,7 +407,11 @@
     str.append(proc_info);
   }
 
+  // DBUG_EXECUTE_IF("sleep_before_lock_thd_data", { fprintf(stderr, "start sleep_before_lock_thd_data\n"); my_sleep(5000000); fprintf(stderr, "stop sleep_before_lock_thd_data\n");});
+
+  DBUG_EXECUTE_IF("sleep_before_lock_thd_data", fprintf(stderr, "locking LOCK_thd_data\n"); );
   pthread_mutex_lock(&thd->LOCK_thd_data);
+  // DBUG_EXECUTE_IF("sleep_before_lock_thd_data", fprintf(stderr, "locked LOCK_thd_data\n"); );
 
   if (thd->query())
   {
@@ -420,6 +424,7 @@
   }
 
   pthread_mutex_unlock(&thd->LOCK_thd_data);
+  DBUG_EXECUTE_IF("sleep_before_lock_thd_data", fprintf(stderr, "unlocked LOCK_thd_data\n"); );
 
   if (str.c_ptr_safe() == buffer)
     return buffer;
@@ -1144,9 +1149,12 @@
     */
     if (mysys_var->current_cond && mysys_var->current_mutex)
     {
+      // DBUG_EXECUTE_IF("sleep_before_kill_lock_open", {fprintf(stderr, "start sleep_before_kill_lock_open\n"); my_sleep(6000000); fprintf(stderr, "stop sleep_before_kill_lock_open\n");});
+fprintf(stderr, "start ::awake, lock mutex\n");
       pthread_mutex_lock(mysys_var->current_mutex);
       pthread_cond_broadcast(mysys_var->current_cond);
       pthread_mutex_unlock(mysys_var->current_mutex);
+fprintf(stderr, "start ::awake, unlock mutex\n");
     }
     pthread_mutex_unlock(&mysys_var->mutex);
   }
diff -wbBdu -u --recursive /s/src/mysql-5.1.47/sql/sql_rename.cc sql/sql_rename.cc
--- /s/src/mysql-5.1.47/sql/sql_rename.cc	2010-05-06 08:27:32.000000000 -0700
+++ sql/sql_rename.cc	2011-03-28 12:51:29.000000000 -0700
@@ -175,6 +175,10 @@
   */
   pthread_mutex_unlock(&LOCK_open);
 
+fprintf(stderr, "start rename_sleep\n");
+my_sleep(5000000);
+fprintf(stderr, "stop rename_sleep\n");
+
   if (!silent && !error)
   {
     binlog_error= write_bin_log(thd, TRUE, thd->query(), thd->query_length());
diff -wbBdu -u --recursive /s/src/mysql-5.1.47/sql/sql_table.cc sql/sql_table.cc
--- /s/src/mysql-5.1.47/sql/sql_table.cc	2010-05-06 08:27:36.000000000 -0700
+++ sql/sql_table.cc	2011-03-28 13:14:52.000000000 -0700
@@ -1902,7 +1902,9 @@
 
   mysql_ha_rm_tables(thd, tables, FALSE);
 
+fprintf(stderr, "rm_table_part2 pre_lock\n");
   pthread_mutex_lock(&LOCK_open);
+fprintf(stderr, "rm_table_part2 locked\n");
 
   /* Disable drop of enabled log tables, must be done before name locking */
   for (table= tables; table; table= table->next_local)
@@ -2050,8 +2052,12 @@
       *(end= path + path_length - reg_ext_length)= '\0';
       DBUG_PRINT("info", ("deleting table of type %d",
                           (table_type ? table_type->db_type : 0)));
+fprintf(stderr, "sleep rm_table_part2 calling ha_delete_table\n");
+my_sleep(5000000);
+fprintf(stderr, "start rm_table_part2 calling ha_delete_table\n");
       error= ha_delete_table(thd, table_type, path, db, table->table_name,
                              !dont_log_query);
+fprintf(stderr, "stop rm_table_part2 calling ha_delete_table\n");
 
       /* No error if non existent table and 'IF EXIST' clause or view */
       if ((error == ENOENT || error == HA_ERR_NO_SUCH_TABLE) && 
@@ -2093,6 +2099,7 @@
     on the table name.
   */
   pthread_mutex_unlock(&LOCK_open);
+fprintf(stderr, "rm_table_part2 unlocked\n");
   DEBUG_SYNC(thd, "rm_table_part2_before_binlog");
   thd->thread_specific_used|= tmp_table_deleted;
   error= 0;