http://sourceware.org/ml/gdb-patches/2010-09/msg00321.html
Subject: [patch] PR 12028 "GDB crashes on a double free during overload resolution"

old_cleanups was being set twice making the later call to 
discard_cleanups ignore the first 'make_cleanup' request.

The patch is proposed for both head and the 7.2 branch.

This has been regression tested on x8664 with gcc-4.4.4-10.fc13


Fix PR 12028: "GDB crashes on a double free during overload resolution "

2010-09-16  Sami Wagiaalla  <swagiaal@redhat.com>

	PR C++/12028
	* valops.c (find_oload_champ_namespace_loop): removed incorrect
	'old_cleanups' reassignment.

2010-09-16  Sami Wagiaalla  <swagiaal@redhat.com>

	* gdb.cp/pr12028.cc: New.
	* gdb.cp/pr12028.exp: New.

diff --git a/gdb/testsuite/gdb.cp/pr12028.cc b/gdb/testsuite/gdb.cp/pr12028.cc
new file mode 100644
index 0000000..0fcab6b
--- /dev/null
+++ b/gdb/testsuite/gdb.cp/pr12028.cc
@@ -0,0 +1,21 @@
+class A{};
+class B{};
+class C: public B {};
+
+namespace D{
+  int foo (A) { return 11; }
+  int foo (C) { return 12; }
+}
+
+int main()
+{
+  A a;
+  B b;
+  C c;
+
+  D::foo (a);
+  //  D::foo (b);
+  D::foo (c);
+
+  return 0;
+}
diff --git a/gdb/testsuite/gdb.cp/pr12028.exp b/gdb/testsuite/gdb.cp/pr12028.exp
new file mode 100644
index 0000000..746c6b5
--- /dev/null
+++ b/gdb/testsuite/gdb.cp/pr12028.exp
@@ -0,0 +1,29 @@
+# Copyright 2008 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+set testfile pr12028
+set srcfile ${testfile}.cc
+if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile} {debug c++}] } {
+    return -1
+}
+
+############################################
+
+if ![runto_main] then {
+    perror "couldn't run to breakpoint main"
+    continue
+}
+
+gdb_test "p D::foo(b)" "Cannot resolve function foo to any overloaded instance"
diff --git a/gdb/valops.c b/gdb/valops.c
index 7fbad10..4e83a04 100644
--- a/gdb/valops.c
+++ b/gdb/valops.c
@@ -2715,7 +2715,7 @@ find_oload_champ_namespace_loop (struct type **arg_types, int nargs,
      function symbol to start off with.)  */
 
   old_cleanups = make_cleanup (xfree, *oload_syms);
-  old_cleanups = make_cleanup (xfree, *oload_champ_bv);
+  make_cleanup (xfree, *oload_champ_bv);
   new_namespace = alloca (namespace_len + 1);
   strncpy (new_namespace, qualified_name, namespace_len);
   new_namespace[namespace_len] = '\0';