--- mariadb-10.3.9/sql/mysqld.cc
+++ mariadb-10.3.9.detach/sql/mysqld.cc
@@ -4842,8 +4842,6 @@
   init_show_explain_psi_keys();
   /* Parameter for threads created for connections */
   (void) pthread_attr_init(&connection_attrib);
-  (void) pthread_attr_setdetachstate(&connection_attrib,
-				     PTHREAD_CREATE_DETACHED);
   pthread_attr_setscope(&connection_attrib, PTHREAD_SCOPE_SYSTEM);
 
 #ifdef HAVE_REPLICATION