diff --git a/z3-data-race.patch b/z3-data-race.patch
new file mode 100644
index 0000000..547b48c
--- /dev/null
+++ b/z3-data-race.patch
@@ -0,0 +1,10 @@
+--- z3-z3-4.11.2/src/solver/parallel_tactic.cpp.orig	2022-09-03 16:47:12.000000000 -0600
++++ z3-z3-4.11.2/src/solver/parallel_tactic.cpp	2023-01-08 21:39:29.169670155 -0700
+@@ -460,6 +460,7 @@ private:
+             conquer->get_model(mdl);
+         }
+         else {
++            std::lock_guard<std::mutex> lock(m_mutex);
+             s.get_solver().get_model(mdl);
+         }
+         if (mdl) {
diff --git a/z3-uninit.patch b/z3-uninit.patch
new file mode 100644
index 0000000..fc3623c
--- /dev/null
+++ b/z3-uninit.patch
@@ -0,0 +1,10 @@
+--- z3-z3-4.11.2/src/sat/sat_lookahead.cpp.orig	2022-09-03 16:47:12.000000000 -0600
++++ z3-z3-4.11.2/src/sat/sat_lookahead.cpp	2023-01-06 15:09:19.198322817 -0700
+@@ -1001,6 +1001,7 @@ namespace sat {
+         m_inconsistent = false;
+         m_qhead = 0;
+         m_bstamp_id = 0;
++        m_istamp_id = 0;
+ 
+         for (unsigned i = 0; i < m_num_vars; ++i) {
+             init_var(i);
diff --git a/z3.spec b/z3.spec
index 1803e4a..9328599 100644
--- a/z3.spec
+++ b/z3.spec
@@ -16,7 +16,7 @@
 
 Name:           z3
 Version:        4.11.2
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Satisfiability Modulo Theories (SMT) solver
 
 License:        MIT
@@ -24,6 +24,10 @@ URL:            https://github.com/Z3Prover/z3
 Source0:        https://github.com/Z3Prover/z3/archive/%{name}-%{version}.tar.gz
 # Change the way python finds the shared object; see bz 1910923
 Patch0:         %{name}-python.patch
+# Fix use of an uninitialized variable
+Patch1:         %{name}-uninit.patch
+# Fix a data race that can cause a segfault; see bz 2157972
+Patch2:         %{name}-data-race.patch
 
 BuildRequires:  cmake
 BuildRequires:  doxygen
@@ -168,8 +172,8 @@ sed -e '/libz3java/s,\(System\.load\)Library("\(.*\)"),\1("%{_libdir}/z3/\2.so")
     -i scripts/update_api.py
 
 %build
-export LANG="C.UTF-8"
-export PYTHON="%{python3}"
+export LANG=C.UTF-8
+export PYTHON=%{python3}
 
 %cmake -G Ninja \
   -DCMAKE_INSTALL_INCLUDEDIR=%{_includedir}/z3 \
@@ -284,6 +288,10 @@ cd -
 %{python3_sitelib}/z3/
 
 %changelog
+* Sun Jan  8 2023 Jerry James <loganjerry@gmail.com> - 4.11.2-2
+- Add -data-race patch to fix segfault (bz 2157972)
+- Add -uninit patch to fix use of an uninitialized value
+
 * Wed Dec 14 2022 Jerry James <loganjerry@gmail.com> - 4.11.2-1
 - Further clarify license of the doc subpackage (SPDX)