diff --git a/0001-vector-Fix-undefined-behaviour-on-realloc.patch b/0001-vector-Fix-undefined-behaviour-on-realloc.patch
new file mode 100644
index 0000000..fedc4bb
--- /dev/null
+++ b/0001-vector-Fix-undefined-behaviour-on-realloc.patch
@@ -0,0 +1,69 @@
+From 41ddc88a80160050b0ac1a51cb258f8918edf9aa Mon Sep 17 00:00:00 2001
+From: "Lucas A. M. Magalhaes" <lamm@linux.ibm.com>
+Date: Wed, 23 Jun 2021 15:05:50 -0300
+Subject: [PATCH] vector: Fix undefined behaviour on realloc
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+On tests listed bellow the reserve method is being called before any
+allocation on the object therefore realloc being called without
+any previous allocation. Inside realloc _data is being used with the
+operator '[]', as it is nullptr at that moment it's an undefined
+behaviour.
+
+This patch simply returns a call to alloc if _data is nullptr.
+
+This tests fails on PowerPC with Segmentation Fault because of this
+issue:
+segment_vector_array_expsize_assign_exceptions_oom_0_none
+segment_vector_array_expsize_assign_exceptions_oom_0_memcheck
+segment_vector_array_expsize_capacity_exceptions_oom_0_none
+segment_vector_array_expsize_capacity_exceptions_oom_0_memcheck
+segment_vector_array_expsize_modifiers_exceptions_oom_0_none
+segment_vector_array_expsize_modifiers_exceptions_oom_0_memcheck
+segment_vector_vector_expsize_assign_exceptions_oom_0_none
+segment_vector_vector_expsize_assign_exceptions_oom_0_memcheck
+segment_vector_vector_expsize_capacity_exceptions_oom_0_none
+segment_vector_vector_expsize_capacity_exceptions_oom_0_memcheck
+segment_vector_vector_expsize_modifiers_exceptions_oom_0_none
+segment_vector_vector_expsize_modifiers_exceptions_oom_0_memcheck
+segment_vector_vector_fixedsize_assign_exceptions_oom_0_none
+segment_vector_vector_fixedsize_assign_exceptions_oom_0_memcheck
+
+Signed-off-by: Lucas A. M. Magalhães lamm@linux.ibm.com
+---
+ include/libpmemobj++/container/vector.hpp | 10 +++++++++-
+ 1 file changed, 9 insertions(+), 1 deletion(-)
+
+diff --git a/include/libpmemobj++/container/vector.hpp b/include/libpmemobj++/container/vector.hpp
+index f430ed50..9810220b 100644
+--- a/include/libpmemobj++/container/vector.hpp
++++ b/include/libpmemobj++/container/vector.hpp
+@@ -2362,7 +2362,8 @@ vector<T>::internal_insert(size_type idx, InputIt first, InputIt last)
+  * Private helper function. Must be called during transaction. Allocates new
+  * memory for capacity_new number of elements and copies or moves old elements
+  * to new memory area. If the current size is greater than capacity_new, the
+- * container is reduced to its first capacity_new elements.
++ * container is reduced to its first capacity_new elements. If was never
++ * allocated behaves as an alloc call.
+  *
+  * param[in] capacity_new new capacity.
+  *
+@@ -2381,6 +2382,13 @@ vector<T>::realloc(size_type capacity_new)
+ {
+ 	assert(pmemobj_tx_stage() == TX_STAGE_WORK);
+ 
++	/*
++	 * If _data == nullptr this object has never allocated any memory
++	 * so we need to behave as alloc instead.
++	 */
++	if (_data == nullptr)
++		return alloc(capacity_new);
++
+ 	/*
+ 	 * XXX: future optimization: we don't have to snapshot data
+ 	 * which we will not overwrite
+-- 
+2.27.0
+
diff --git a/libpmemobj-cpp.spec b/libpmemobj-cpp.spec
index e8ac0a7..ef23412 100644
--- a/libpmemobj-cpp.spec
+++ b/libpmemobj-cpp.spec
@@ -4,7 +4,7 @@
 
 Name:		libpmemobj-cpp
 Version:	1.12
-Release:	6%{?dist}
+Release:	7%{?dist}
 Summary:	C++ bindings for libpmemobj
 # Note: tests/external/libcxx is dual licensed using University of Illinois "BSD-Like" license and the MIT license. It's used only during development/testing and is NOT part of the binary RPM.
 License:	BSD
@@ -12,6 +12,8 @@ URL:		http://pmem.io/pmdk/cpp_obj/
 
 Source0:	https://github.com/pmem/%{name}/archive/%{upstreamversion}.tar.gz#/%{name}-%{upstreamversion}.tar.gz
 
+Patch0:		0001-vector-Fix-undefined-behaviour-on-realloc.patch
+
 BuildRequires:	libpmemobj-devel >= %{min_libpmemobj_ver}
 BuildRequires:	cmake >= 3.3
 BuildRequires:	glibc-devel
@@ -110,6 +112,10 @@ cd build
 %make_install
 
 %changelog
+* Mon Jan 24 2022 Bryan Gurney <bgurney@redhat.com> - 1.12-7
+- Add patch to fix undefined behavior on realloc
+- Related: rhbz#2034641
+
 * Mon Aug 09 2021 Mohan Boddu <mboddu@redhat.com> - 1.12-6
 - Rebuilt for IMA sigs, glibc 2.34, aarch64 flags
   Related: rhbz#1991688
diff --git a/tests/run_test.sh b/tests/run_test.sh
index 9e05217..d75dbe2 100644
--- a/tests/run_test.sh
+++ b/tests/run_test.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -e
 
 NRCPUS=$(getconf _NPROCESSORS_ONLN)
 patchfile="$PWD/libpmemobj-test-installed-libs.patch"
@@ -9,7 +10,7 @@ patch -p1 < $patchfile
 
 mkdir build
 cd build
-cmake ..
+cmake .. -DTESTS_USE_VALGRIND=OFF -DTESTS_LONG=OFF -DTESTS_USE_FORCED_PMEM=ON
 make -j $NRCPUS
 
 ctest --output-on-failure