Index: psymtab.c
===================================================================
RCS file: /cvs/src/src/gdb/psymtab.c,v
retrieving revision 1.30
diff -d -u -r1.30 psymtab.c
--- psymtab.c	10 Jun 2011 21:48:04 -0000	1.30
+++ psymtab.c	27 Oct 2011 19:39:02 -0000
@@ -1093,6 +1093,7 @@
       if (ps->readin)
 	continue;
 
+      QUIT;
       fullname = psymtab_to_fullname (ps);
       (*fun) (ps->filename, fullname, data);
     }
Index: symtab.c
===================================================================
RCS file: /cvs/src/src/gdb/symtab.c,v
retrieving revision 1.283
diff -d -u -r1.283 symtab.c
--- symtab.c	21 Jul 2011 15:13:29 -0000	1.283
+++ symtab.c	27 Oct 2011 19:39:02 -0000
@@ -3573,6 +3573,26 @@
   return 1;
 }
 
+/* Free any memory associated with a completion list.  */
+static void
+free_completion_list (char ***list_ptr)
+{
+  int i = 0;
+  char **list = *list_ptr;
+  while (list[i] != NULL)
+    {
+      xfree (list[i]);
+      i++;
+    }
+  xfree (list);
+}
+
+static void
+do_free_completion_list (void *list)
+{
+  free_completion_list (list);
+}
+
 /* Helper routine for make_symbol_completion_list.  */
 
 static int return_val_size;
@@ -3810,6 +3830,7 @@
   /* Length of sym_text.  */
   int sym_text_len;
   struct add_name_data datum;
+  struct cleanup *back_to;
 
   /* Now look for the symbol we are supposed to complete on.  */
   {
@@ -3886,6 +3907,7 @@
   return_val_index = 0;
   return_val = (char **) xmalloc ((return_val_size + 1) * sizeof (char *));
   return_val[0] = NULL;
+  back_to = make_cleanup (do_free_completion_list, &return_val);
 
   datum.sym_text = sym_text;
   datum.sym_text_len = sym_text_len;
@@ -3995,6 +4017,7 @@
       macro_for_each (macro_user_macros, add_macro_name, &datum);
     }
 
+  discard_cleanups (back_to);
   return (return_val);
 }
 
@@ -4244,12 +4267,15 @@
   char **list = (char **) xmalloc (list_alloced * sizeof (char *));
   const char *base_name;
   struct add_partial_filename_data datum;
+  struct cleanup *back_to;
 
   list[0] = NULL;
 
   if (!have_full_symbols () && !have_partial_symbols ())
     return list;
 
+  back_to = make_cleanup (do_free_completion_list, &list);
+
   ALL_SYMTABS (objfile, s)
     {
       if (not_interesting_fname (s->filename))
@@ -4285,6 +4311,7 @@
   datum.list_used = &list_used;
   datum.list_alloced = &list_alloced;
   map_partial_symbol_filenames (maybe_add_partial_symtab_filename, &datum);
+  discard_cleanups (back_to);
 
   return list;
 }