diff --git a/psutil/tests/test_testutils.py b/psutil/tests/test_testutils.py
index ef98a3abe..f994d0cbe 100755
--- a/psutil/tests/test_testutils.py
+++ b/psutil/tests/test_testutils.py
@@ -27,8 +27,11 @@
 from psutil.tests import CI_TESTING
 from psutil.tests import COVERAGE
 from psutil.tests import HAS_NET_CONNECTIONS_UNIX
+from psutil.tests import LIBC
 from psutil.tests import PYTHON_EXE
 from psutil.tests import PYTHON_EXE_ENV
+from psutil.tests import QEMU_USER
+from psutil.tests import S390X
 from psutil.tests import PsutilTestCase
 from psutil.tests import TestMemoryLeak
 from psutil.tests import bind_socket
@@ -442,6 +445,10 @@ def test_process_namespace(self):
         fun = [x for x in ns.iter(ns.getters) if x[1] == 'ppid'][0][0]
         self.assertEqual(fun(), p.ppid())
 
+    @unittest.skipIf(
+        QEMU_USER and S390X and LIBC != "glibc",
+        "deadlock with QEMU on s390x musl libc",
+    )
     def test_system_namespace(self):
         ns = system_namespace()
         fun = [x for x in ns.iter(ns.getters) if x[1] == 'net_if_addrs'][0][0]