automerging bugfixes in latest mysql-trunk-bugfixing.

client/mysqlbinlog.cc

@@ -2032,6 +2032,7 @@ int main(int argc, char** argv)
   {
     usage();
     free_defaults(defaults_argv);
+    my_thread_end();
     exit(1);
   }
 

sql/rpl_mi.cc

@@ -164,7 +164,29 @@ int init_master_info(Master_info* mi, const char* master_info_fname,
     */
     if (thread_mask & SLAVE_SQL)
     {
+      bool hot_log= FALSE;
+      /* 
+         my_b_seek does an implicit flush_io_cache, so we need to:
+
+         1. check if this log is active (hot)
+         2. if it is we keep log_lock until the seek ends, otherwise 
+            release it right away.
+
+         If we did not take log_lock, SQL thread might race with IO
+         thread for the IO_CACHE mutex.
+
+       */
+      mysql_mutex_t *log_lock= mi->rli.relay_log.get_log_lock();
+      mysql_mutex_lock(log_lock);
+      hot_log= mi->rli.relay_log.is_active(mi->rli.linfo.log_file_name);
+
+      if (!hot_log)
+        mysql_mutex_unlock(log_lock);
+
       my_b_seek(mi->rli.cur_log, (my_off_t) 0);
+
+      if (hot_log)
+        mysql_mutex_unlock(log_lock);
     }
     DBUG_RETURN(0);
   }

sql/sql_table.cc

@@ -2202,7 +2202,7 @@ int mysql_rm_table_part2(THD *thd, TABLE_LIST *tables, bool if_exists,
   if (some_tables_deleted || tmp_table_deleted || !error)
   {
     query_cache_invalidate3(thd, tables, 0);
-    if (!dont_log_query)
+    if (!dont_log_query && mysql_bin_log.is_open())
     {
       if (!thd->is_current_stmt_binlog_format_row() ||
           (non_temp_tables_count > 0 && !tmp_table_deleted))