diff --git a/gdb-6.5-last-address-space-byte-test.patch b/gdb-6.5-last-address-space-byte-test.patch
new file mode 100644
index 0000000..bc60ada
--- /dev/null
+++ b/gdb-6.5-last-address-space-byte-test.patch
@@ -0,0 +1,56 @@
+Index: gdb/testsuite/gdb.base/largecore-last-address-lock.exp
+===================================================================
+RCS file: gdb/testsuite/gdb.base/largecore-last-address-lock.exp
+diff -N gdb/testsuite/gdb.base/largecore-last-address-lock.exp
+--- /dev/null	1 Jan 1970 00:00:00 -0000
++++ gdb/testsuite/gdb.base/largecore-last-address-lock.exp	15 Nov 2006 21:43:24 -0000
+@@ -0,0 +1,49 @@
++# Copyright 2006 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 2 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, write to the Free Software
++# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  
++
++if $tracelevel then {
++    strace $tracelevel
++}
++
++# Get things started.
++
++gdb_exit
++gdb_start
++
++# i386 (32-bit) only: gdb with Red Hat largecore patch did lock up:
++# https://enterprise.redhat.com/issue-tracker/?module=issues&action=view&tid=103263
++# https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=210614
++
++# i386: Bug exists when the `target_xfer_memory' condition
++# `(memaddr + len < region->hi)' operates on 64-bit operands on
++# largecore-patched with 32-bit addresses and so it can get `false' with
++# arbitrary `len'.
++
++# x86_64: The bug is not present as the operands and calculations have the same
++# bit size.  Would would still need to pass there the highest address
++# (`memaddr == 0xffffffffffffffff') but we would need to pass `len == 0'
++# to make the condition `(memaddr + len < region->hi)' false.
++# `len == 0' would get caught eariler.
++
++# Error in the success case is immediate.
++set timeoutold ${timeout}
++set timeout 10
++
++gdb_test "x/xb 0xffffffff" \
++         "Cannot access memory at address 0xffffffff" \
++         "Read the last address space byte"
++
++set timeout ${timeoutold}
diff --git a/gdb.spec b/gdb.spec
index 5b782df..ba883af 100644
--- a/gdb.spec
+++ b/gdb.spec
@@ -11,7 +11,7 @@ Name: gdb
 Version: 6.5
 
 # The release always contains a leading reserved number, start it at 0.
-Release: 15%{?dist}
+Release: 16%{?dist}
 
 License: GPL
 Group: Development/Debuggers
@@ -285,6 +285,7 @@ Patch201: gdb-6.5-gcore-i386-on-amd64.patch
 
 # Fix deadlock accessing last address space byte; for corrupted backtraces.
 Patch203: gdb-6.5-last-address-space-byte.patch
+Patch211: gdb-6.5-last-address-space-byte-test.patch
 
 # Fix "??" resolving of symbols from (non-prelinked) debuginfo packages.
 # "gdb-6.5-matching_bfd_sections.patch" is a prerequisited CVS backport.
@@ -418,6 +419,7 @@ and printing their data.
 %patch207 -p1
 %patch208 -p1
 %patch209 -p1
+%patch211 -p1
 
 # Change the version that gets printed at GDB startup, so it is RedHat
 # specific.
@@ -580,6 +582,9 @@ fi
 # don't include the files in include, they are part of binutils
 
 %changelog
+* Wed Nov 16 2006 Jan Kratochvil <jan.kratochvil@redhat.com> - 6.5-16
+- Provide testcase for accessing the last address space byte.
+
 * Wed Nov  9 2006 Jan Kratochvil <jan.kratochvil@redhat.com> - 6.5-15
 - Fix readline segfault on excessively long hand-typed lines.