diff --git a/tests/regress/osx_qemu_thread_create_crash.py b/tests/regress/osx_qemu_thread_create_crash.py
new file mode 100755
index 00000000..b34b319b
--- /dev/null
+++ b/tests/regress/osx_qemu_thread_create_crash.py
@@ -0,0 +1,20 @@
+#!/usr/bin/env python
+
+import platform
+import resource
+
+from unicorn import *
+
+import regress
+
+# OS X: OK with 2047 iterations.
+# OS X: Crashes at 2048:th iteration ("qemu: qemu_thread_create: Resource temporarily unavailable").
+# Linux: No crashes observed.
+class ThreadCreateCrash(regress.RegressTest):
+    def test(self):
+        for i in xrange(2048):
+            Uc(UC_ARCH_X86, UC_MODE_64)
+        self.assertTrue(True, "If not reached, then we have a crashing bug.")
+
+if __name__ == '__main__':
+    regress.main()
diff --git a/tests/regress/potential_memory_leak.py b/tests/regress/potential_memory_leak.py
new file mode 100755
index 00000000..29a29987
--- /dev/null
+++ b/tests/regress/potential_memory_leak.py
@@ -0,0 +1,29 @@
+#!/usr/bin/env python
+
+import platform
+import resource
+
+from unicorn import *
+
+import regress
+
+class MemoryLeak(regress.RegressTest):
+    def test(self):
+        if platform.system() == "Darwin":
+            rusage_multiplier = 1
+        elif platform.system() == "Linux":
+            rusage_multiplier = 1024
+        else:
+            # resource.getrusage(...) is platform dependent. Only tested under OS X and Linux.
+            return
+        max_rss_before = resource.getrusage(resource.RUSAGE_SELF).ru_maxrss * rusage_multiplier
+        for i in xrange(10000):
+            mu = Uc(UC_ARCH_X86, UC_MODE_64)
+            mu.mem_map(0, 4096)
+            mu.emu_start(0, 0)
+        max_rss_after = resource.getrusage(resource.RUSAGE_SELF).ru_maxrss * rusage_multiplier
+        rss_increase_per_iteration = (max_rss_after - max_rss_before) / i
+        self.assertLess(rss_increase_per_iteration, 8000)
+
+if __name__ == '__main__':
+    regress.main()