diff --git a/Doc/library/mmap.rst b/Doc/library/mmap.rst
index 9c0b828fbd4d28..d82dda9e54b150 100644
--- a/Doc/library/mmap.rst
+++ b/Doc/library/mmap.rst
@@ -289,6 +289,8 @@ To map anonymous memory, -1 should be passed as the fileno along with the length
       pagefile) will silently create a new map with the original data copied over
       up to the length of the new size.
 
+      Availability: Windows and systems with the ``mremap()`` system call.
+
       .. versionchanged:: 3.11
          Correctly fails if attempting to resize when another map is held
          Allows resize against an anonymous map on Windows
diff --git a/Doc/whatsnew/3.15.rst b/Doc/whatsnew/3.15.rst
index 351ba0cd2afdfe..3236213de5aaa2 100644
--- a/Doc/whatsnew/3.15.rst
+++ b/Doc/whatsnew/3.15.rst
@@ -701,6 +701,9 @@ Porting to Python 3.15
   :func:`resource.setrlimit` and :func:`resource.prlimit` is now deprecated.
   (Contributed by Serhiy Storchaka in :gh:`137044`.)
 
+* :meth:`~mmap.mmap.resize` has been removed on platforms that don't support the
+  underlying syscall, instead of raising a :exc:`SystemError`.
+
 
 Deprecated C APIs
 -----------------
diff --git a/Lib/test/test_free_threading/test_cprofile.py b/Lib/test/test_free_threading/test_cprofile.py
new file mode 100644
index 00000000000000..361b800d6b9029
--- /dev/null
+++ b/Lib/test/test_free_threading/test_cprofile.py
@@ -0,0 +1,43 @@
+import unittest
+
+from test.support import threading_helper
+
+import cProfile
+import pstats
+
+
+NTHREADS = 10
+INSERT_PER_THREAD = 1000
+
+
+@threading_helper.requires_working_threading()
+class TestCProfile(unittest.TestCase):
+    def test_cprofile_racing_list_insert(self):
+        def list_insert(lst):
+            for i in range(INSERT_PER_THREAD):
+                lst.insert(0, i)
+
+        lst = []
+
+        with cProfile.Profile() as pr:
+            threading_helper.run_concurrently(
+                worker_func=list_insert, nthreads=NTHREADS, args=(lst,)
+            )
+            pr.create_stats()
+            ps = pstats.Stats(pr)
+            stats_profile = ps.get_stats_profile()
+            list_insert_profile = stats_profile.func_profiles[
+                "<method 'insert' of 'list' objects>"
+            ]
+            # Even though there is no explicit recursive call to insert,
+            # cProfile may record some calls as recursive due to limitations
+            # in its handling of multithreaded programs. This issue is not
+            # directly related to FT Python itself; however, it tends to be
+            # more noticeable when using FT Python. Therefore, consider only
+            # the calls section and disregard the recursive part.
+            list_insert_ncalls = list_insert_profile.ncalls.split("/")[0]
+            self.assertEqual(
+                int(list_insert_ncalls), NTHREADS * INSERT_PER_THREAD
+            )
+
+        self.assertEqual(len(lst), NTHREADS * INSERT_PER_THREAD)
diff --git a/Lib/test/test_mmap.py b/Lib/test/test_mmap.py
index da69770915092a..75ea1a671b67de 100644
--- a/Lib/test/test_mmap.py
+++ b/Lib/test/test_mmap.py
@@ -57,6 +57,7 @@ def test_basic(self):
             f.write(b'\0'* (PAGESIZE-3) )
             f.flush()
             m = mmap.mmap(f.fileno(), 2 * PAGESIZE)
+            self.addCleanup(m.close)
         finally:
             f.close()
 
@@ -114,31 +115,28 @@ def test_basic(self):
         # Try to seek to negative position...
         self.assertRaises(ValueError, m.seek, -len(m)-1, 2)
 
+    @unittest.skipUnless(hasattr(mmap.mmap, 'resize'), 'requires mmap.resize')
+    def test_resize(self):
+        # Create a file to be mmap'ed.
+        with open(TESTFN, 'bw+') as f:
+            # Write 2 pages worth of data to the file
+            f.write(b'\0'* 2 * PAGESIZE)
+            f.flush()
+            m = mmap.mmap(f.fileno(), 2 * PAGESIZE)
+            self.addCleanup(m.close)
+
         # Try resizing map
-        try:
-            m.resize(512)
-        except SystemError:
-            # resize() not supported
-            # No messages are printed, since the output of this test suite
-            # would then be different across platforms.
-            pass
-        else:
-            # resize() is supported
-            self.assertEqual(len(m), 512)
-            # Check that we can no longer seek beyond the new size.
-            self.assertRaises(ValueError, m.seek, 513, 0)
-
-            # Check that the underlying file is truncated too
-            # (bug #728515)
-            f = open(TESTFN, 'rb')
-            try:
-                f.seek(0, 2)
-                self.assertEqual(f.tell(), 512)
-            finally:
-                f.close()
-            self.assertEqual(m.size(), 512)
+        m.resize(512)
+        self.assertEqual(len(m), 512)
+        # Check that we can no longer seek beyond the new size.
+        self.assertRaises(ValueError, m.seek, 513, 0)
 
-        m.close()
+        # Check that the underlying file is truncated too
+        # (bug #728515)
+        with open(TESTFN, 'rb') as f:
+            f.seek(0, 2)
+            self.assertEqual(f.tell(), 512)
+        self.assertEqual(m.size(), 512)
 
     def test_access_parameter(self):
         # Test for "access" keyword parameter
@@ -183,15 +181,10 @@ def test_access_parameter(self):
             else:
                 self.fail("Able to write to readonly memory map")
 
-            # Ensuring that readonly mmap can't be resized
-            try:
-                m.resize(2*mapsize)
-            except SystemError:   # resize is not universally supported
-                pass
-            except TypeError:
-                pass
-            else:
-                self.fail("Able to resize readonly memory map")
+            if hasattr(m, 'resize'):
+                # Ensuring that readonly mmap can't be resized
+                with self.assertRaises(TypeError):
+                    m.resize(2 * mapsize)
             with open(TESTFN, "rb") as fp:
                 self.assertEqual(fp.read(), b'a'*mapsize,
                                  "Readonly memory map data file was modified")
@@ -242,8 +235,9 @@ def test_access_parameter(self):
             with open(TESTFN, "rb") as fp:
                 self.assertEqual(fp.read(), b'c'*mapsize,
                                  "Copy-on-write test data file should not be modified.")
-            # Ensuring copy-on-write maps cannot be resized
-            self.assertRaises(TypeError, m.resize, 2*mapsize)
+            if hasattr(m, 'resize'):
+                # Ensuring copy-on-write maps cannot be resized
+                self.assertRaises(TypeError, m.resize, 2 * mapsize)
             m.close()
 
         # Ensuring invalid access parameter raises exception
@@ -282,10 +276,11 @@ def test_trackfd_parameter(self, close_original_fd):
                 self.assertEqual(len(m), size)
                 with self.assertRaises(ValueError):
                     m.size()
-                with self.assertRaises(ValueError):
-                    m.resize(size * 2)
-                with self.assertRaises(ValueError):
-                    m.resize(size // 2)
+                if hasattr(m, 'resize'):
+                    with self.assertRaises(ValueError):
+                        m.resize(size * 2)
+                    with self.assertRaises(ValueError):
+                        m.resize(size // 2)
                 self.assertIs(m.closed, False)
 
                 # Smoke-test other API
@@ -313,8 +308,9 @@ def test_trackfd_neg1(self):
         with mmap.mmap(-1, size, trackfd=False) as m:
             with self.assertRaises(ValueError):
                 m.size()
-            with self.assertRaises(ValueError):
-                m.resize(size // 2)
+            if hasattr(m, 'resize'):
+                with self.assertRaises(ValueError):
+                    m.resize(size // 2)
             self.assertEqual(len(m), size)
             m[0] = ord('a')
             assert m[0] == ord('a')
@@ -608,13 +604,9 @@ def test_offset (self):
             self.assertEqual(m[0:3], b'foo')
             f.close()
 
-            # Try resizing map
-            try:
+            if hasattr(m, 'resize'):
+                # Try resizing map
                 m.resize(512)
-            except SystemError:
-                pass
-            else:
-                # resize() is supported
                 self.assertEqual(len(m), 512)
                 # Check that we can no longer seek beyond the new size.
                 self.assertRaises(ValueError, m.seek, 513, 0)
@@ -806,14 +798,12 @@ def test_write_returning_the_number_of_bytes_written(self):
         self.assertEqual(mm.write(b"yz"), 2)
         self.assertEqual(mm.write(b"python"), 6)
 
+    @unittest.skipUnless(hasattr(mmap.mmap, 'resize'), 'requires mmap.resize')
     def test_resize_past_pos(self):
         m = mmap.mmap(-1, 8192)
         self.addCleanup(m.close)
         m.read(5000)
-        try:
-            m.resize(4096)
-        except SystemError:
-            self.skipTest("resizing not supported")
+        m.resize(4096)
         self.assertEqual(m.read(14), b'')
         self.assertRaises(ValueError, m.read_byte)
         self.assertRaises(ValueError, m.write_byte, 42)
@@ -895,6 +885,7 @@ def test_madvise(self):
         self.assertEqual(m.madvise(mmap.MADV_NORMAL, 0, 2), None)
         self.assertEqual(m.madvise(mmap.MADV_NORMAL, 0, size), None)
 
+    @unittest.skipUnless(hasattr(mmap.mmap, 'resize'), 'requires mmap.resize')
     def test_resize_up_anonymous_mapping(self):
         """If the mmap is backed by the pagefile ensure a resize up can happen
         and that the original data is still in place
@@ -911,16 +902,13 @@ def test_resize_up_anonymous_mapping(self):
                 with self.assertRaises(ValueError):
                     m.resize(new_size)
             else:
-                try:
-                    m.resize(new_size)
-                except SystemError:
-                    pass
-                else:
-                    self.assertEqual(len(m), new_size)
-                    self.assertEqual(m[:start_size], data)
-                    self.assertEqual(m[start_size:], b'\0' * (new_size - start_size))
+                m.resize(new_size)
+                self.assertEqual(len(m), new_size)
+                self.assertEqual(m[:start_size], data)
+                self.assertEqual(m[start_size:], b'\0' * (new_size - start_size))
 
     @unittest.skipUnless(os.name == 'posix', 'requires Posix')
+    @unittest.skipUnless(hasattr(mmap.mmap, 'resize'), 'requires mmap.resize')
     def test_resize_up_private_anonymous_mapping(self):
         start_size = PAGESIZE
         new_size = 2 * start_size
@@ -928,15 +916,12 @@ def test_resize_up_private_anonymous_mapping(self):
 
         with mmap.mmap(-1, start_size, flags=mmap.MAP_PRIVATE) as m:
             m[:] = data
-            try:
-                m.resize(new_size)
-            except SystemError:
-                pass
-            else:
-                self.assertEqual(len(m), new_size)
-                self.assertEqual(m[:start_size], data)
-                self.assertEqual(m[start_size:], b'\0' * (new_size - start_size))
+            m.resize(new_size)
+            self.assertEqual(len(m), new_size)
+            self.assertEqual(m[:start_size], data)
+            self.assertEqual(m[start_size:], b'\0' * (new_size - start_size))
 
+    @unittest.skipUnless(hasattr(mmap.mmap, 'resize'), 'requires mmap.resize')
     def test_resize_down_anonymous_mapping(self):
         """If the mmap is backed by the pagefile ensure a resize down up can happen
         and that a truncated form of the original data is still in place
@@ -947,17 +932,13 @@ def test_resize_down_anonymous_mapping(self):
 
         with mmap.mmap(-1, start_size) as m:
             m[:] = data
-            try:
-                m.resize(new_size)
-            except SystemError:
-                pass
-            else:
-                self.assertEqual(len(m), new_size)
-                self.assertEqual(m[:], data[:new_size])
-                if sys.platform.startswith(('linux', 'android')):
-                    # Can't expand to its original size.
-                    with self.assertRaises(ValueError):
-                        m.resize(start_size)
+            m.resize(new_size)
+            self.assertEqual(len(m), new_size)
+            self.assertEqual(m[:], data[:new_size])
+            if sys.platform.startswith(('linux', 'android')):
+                # Can't expand to its original size.
+                with self.assertRaises(ValueError):
+                    m.resize(start_size)
 
     @unittest.skipUnless(os.name == 'nt', 'requires Windows')
     def test_resize_fails_if_mapping_held_elsewhere(self):
diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py
index 6317d4657619f0..0fc5415c390145 100644
--- a/Lib/test/test_typing.py
+++ b/Lib/test/test_typing.py
@@ -9788,6 +9788,19 @@ class B(str): ...
         self.assertIs(type(field_c2.__metadata__[0]), float)
         self.assertIs(type(field_c3.__metadata__[0]), bool)
 
+    def test_forwardref_partial_evaluation(self):
+        # Test that Annotated partially evaluates if it contains a ForwardRef
+        # See: https://github.com/python/cpython/issues/137706
+        def f(x: Annotated[undefined, '']): pass
+
+        ann = annotationlib.get_annotations(f, format=annotationlib.Format.FORWARDREF)
+
+        # Test that the attributes are retrievable from the partially evaluated annotation
+        x_ann = ann['x']
+        self.assertIs(get_origin(x_ann), Annotated)
+        self.assertEqual(x_ann.__origin__, EqualToForwardRef('undefined', owner=f))
+        self.assertEqual(x_ann.__metadata__, ('',))
+
 
 class TypeAliasTests(BaseTestCase):
     def test_canonical_usage_with_variable_annotation(self):
diff --git a/Lib/typing.py b/Lib/typing.py
index ea25e3832bd0be..babe3c44d9dc55 100644
--- a/Lib/typing.py
+++ b/Lib/typing.py
@@ -1027,8 +1027,10 @@ def evaluate_forward_ref(
 
 
 def _is_unpacked_typevartuple(x: Any) -> bool:
+    # Need to check 'is True' here
+    # See: https://github.com/python/cpython/issues/137706
     return ((not isinstance(x, type)) and
-            getattr(x, '__typing_is_unpacked_typevartuple__', False))
+            getattr(x, '__typing_is_unpacked_typevartuple__', False) is True)
 
 
 def _is_typevar_like(x: Any) -> bool:
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2025-08-28-09-29-46.gh-issue-116738.yLZJpV.rst b/Misc/NEWS.d/next/Core_and_Builtins/2025-08-28-09-29-46.gh-issue-116738.yLZJpV.rst
new file mode 100644
index 00000000000000..2bb68035b56509
--- /dev/null
+++ b/Misc/NEWS.d/next/Core_and_Builtins/2025-08-28-09-29-46.gh-issue-116738.yLZJpV.rst
@@ -0,0 +1,2 @@
+Make :mod:`cProfile` thread-safe on the :term:`free threaded <free
+threading>` build.
diff --git a/Misc/NEWS.d/next/Library/2025-08-31-12-34-02.gh-issue-138205.iHXb1z.rst b/Misc/NEWS.d/next/Library/2025-08-31-12-34-02.gh-issue-138205.iHXb1z.rst
new file mode 100644
index 00000000000000..0dd94324ffd2ea
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-08-31-12-34-02.gh-issue-138205.iHXb1z.rst
@@ -0,0 +1,2 @@
+Removed the :meth:`~mmap.mmap.resize` method on platforms that don't support the
+underlying syscall, instead of raising a :exc:`SystemError`.
diff --git a/Misc/NEWS.d/next/Library/2025-09-05-21-10-24.gh-issue-137706.0EztiJ.rst b/Misc/NEWS.d/next/Library/2025-09-05-21-10-24.gh-issue-137706.0EztiJ.rst
new file mode 100644
index 00000000000000..9eed50ec20a8f6
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-09-05-21-10-24.gh-issue-137706.0EztiJ.rst
@@ -0,0 +1 @@
+Fix the partial evaluation of annotations that use ``typing.Annotated[T, x]`` where ``T`` is a forward reference.
diff --git a/Modules/_lsprof.c b/Modules/_lsprof.c
index d0074b2a0d1f4d..c20dbc3f4f4bfb 100644
--- a/Modules/_lsprof.c
+++ b/Modules/_lsprof.c
@@ -534,6 +534,7 @@ static int statsForEntry(rotating_node_t *node, void *arg)
 }
 
 /*[clinic input]
+@critical_section
 _lsprof.Profiler.getstats
 
     cls: defining_class
@@ -565,7 +566,7 @@ profiler_subentry objects:
 
 static PyObject *
 _lsprof_Profiler_getstats_impl(ProfilerObject *self, PyTypeObject *cls)
-/*[clinic end generated code: output=1806ef720019ee03 input=445e193ef4522902]*/
+/*[clinic end generated code: output=1806ef720019ee03 input=3dc69eb85ed73d91]*/
 {
     statscollector_t collect;
     collect.state = _PyType_GetModuleState(cls);
@@ -613,6 +614,7 @@ setBuiltins(ProfilerObject *pObj, int nvalue)
 }
 
 /*[clinic input]
+@critical_section
 _lsprof.Profiler._pystart_callback
 
     code: object
@@ -624,7 +626,7 @@ _lsprof.Profiler._pystart_callback
 static PyObject *
 _lsprof_Profiler__pystart_callback_impl(ProfilerObject *self, PyObject *code,
                                         PyObject *instruction_offset)
-/*[clinic end generated code: output=5fec8b7ad5ed25e8 input=b166e6953c579cda]*/
+/*[clinic end generated code: output=5fec8b7ad5ed25e8 input=b61a0e79cf1f8499]*/
 {
     ptrace_enter_call((PyObject*)self, (void *)code, code);
 
@@ -632,6 +634,7 @@ _lsprof_Profiler__pystart_callback_impl(ProfilerObject *self, PyObject *code,
 }
 
 /*[clinic input]
+@critical_section
 _lsprof.Profiler._pythrow_callback
 
     code: object
@@ -645,7 +648,7 @@ static PyObject *
 _lsprof_Profiler__pythrow_callback_impl(ProfilerObject *self, PyObject *code,
                                         PyObject *instruction_offset,
                                         PyObject *exception)
-/*[clinic end generated code: output=0a32988919dfb94c input=fd728fc2c074f5e6]*/
+/*[clinic end generated code: output=0a32988919dfb94c input=60c7f272206d3758]*/
 {
     ptrace_enter_call((PyObject*)self, (void *)code, code);
 
@@ -653,6 +656,7 @@ _lsprof_Profiler__pythrow_callback_impl(ProfilerObject *self, PyObject *code,
 }
 
 /*[clinic input]
+@critical_section
 _lsprof.Profiler._pyreturn_callback
 
     code: object
@@ -667,7 +671,7 @@ _lsprof_Profiler__pyreturn_callback_impl(ProfilerObject *self,
                                          PyObject *code,
                                          PyObject *instruction_offset,
                                          PyObject *retval)
-/*[clinic end generated code: output=9e2f6fc1b882c51e input=667ffaeb2fa6fd1f]*/
+/*[clinic end generated code: output=9e2f6fc1b882c51e input=0ddcc1ec53faa928]*/
 {
     ptrace_leave_call((PyObject*)self, (void *)code);
 
@@ -703,6 +707,7 @@ PyObject* get_cfunc_from_callable(PyObject* callable, PyObject* self_arg, PyObje
 }
 
 /*[clinic input]
+@critical_section
 _lsprof.Profiler._ccall_callback
 
     code: object
@@ -717,7 +722,7 @@ static PyObject *
 _lsprof_Profiler__ccall_callback_impl(ProfilerObject *self, PyObject *code,
                                       PyObject *instruction_offset,
                                       PyObject *callable, PyObject *self_arg)
-/*[clinic end generated code: output=152db83cabd18cad input=0e66687cfb95c001]*/
+/*[clinic end generated code: output=152db83cabd18cad input=2fc1e0630ee5e32b]*/
 {
     if (self->flags & POF_BUILTINS) {
         PyObject* cfunc = get_cfunc_from_callable(callable, self_arg, self->missing);
@@ -733,6 +738,7 @@ _lsprof_Profiler__ccall_callback_impl(ProfilerObject *self, PyObject *code,
 }
 
 /*[clinic input]
+@critical_section
 _lsprof.Profiler._creturn_callback
 
     code: object
@@ -748,7 +754,7 @@ _lsprof_Profiler__creturn_callback_impl(ProfilerObject *self, PyObject *code,
                                         PyObject *instruction_offset,
                                         PyObject *callable,
                                         PyObject *self_arg)
-/*[clinic end generated code: output=1e886dde8fed8fb0 input=b18afe023746923a]*/
+/*[clinic end generated code: output=1e886dde8fed8fb0 input=bdc246d6b5b8714a]*/
 {
     if (self->flags & POF_BUILTINS) {
         PyObject* cfunc = get_cfunc_from_callable(callable, self_arg, self->missing);
@@ -780,6 +786,7 @@ static const struct {
 
 
 /*[clinic input]
+@critical_section
 _lsprof.Profiler.enable
 
     subcalls: bool = True
@@ -796,7 +803,7 @@ Start collecting profiling information.
 static PyObject *
 _lsprof_Profiler_enable_impl(ProfilerObject *self, int subcalls,
                              int builtins)
-/*[clinic end generated code: output=1e747f9dc1edd571 input=9ab81405107ab7f1]*/
+/*[clinic end generated code: output=1e747f9dc1edd571 input=0b88115b1c796173]*/
 {
     int all_events = 0;
     if (setSubcalls(self, subcalls) < 0 || setBuiltins(self, builtins) < 0) {
@@ -869,6 +876,7 @@ flush_unmatched(ProfilerObject *pObj)
 
 
 /*[clinic input]
+@critical_section
 _lsprof.Profiler.disable
 
 Stop collecting profiling information.
@@ -876,7 +884,7 @@ Stop collecting profiling information.
 
 static PyObject *
 _lsprof_Profiler_disable_impl(ProfilerObject *self)
-/*[clinic end generated code: output=838cffef7f651870 input=05700b3fc68d1f50]*/
+/*[clinic end generated code: output=838cffef7f651870 input=f7e4787cae20f7f6]*/
 {
     if (self->flags & POF_EXT_TIMER) {
         PyErr_SetString(PyExc_RuntimeError,
@@ -928,6 +936,7 @@ _lsprof_Profiler_disable_impl(ProfilerObject *self)
 }
 
 /*[clinic input]
+@critical_section
 _lsprof.Profiler.clear
 
 Clear all profiling information collected so far.
@@ -935,7 +944,7 @@ Clear all profiling information collected so far.
 
 static PyObject *
 _lsprof_Profiler_clear_impl(ProfilerObject *self)
-/*[clinic end generated code: output=dd1c668fb84b1335 input=fbe1f88c28be4f98]*/
+/*[clinic end generated code: output=dd1c668fb84b1335 input=4aab219d5d7a9bec]*/
 {
     if (self->flags & POF_EXT_TIMER) {
         PyErr_SetString(PyExc_RuntimeError,
diff --git a/Modules/clinic/_lsprof.c.h b/Modules/clinic/_lsprof.c.h
index c426cd6fe02f39..acb4aaf27e377f 100644
--- a/Modules/clinic/_lsprof.c.h
+++ b/Modules/clinic/_lsprof.c.h
@@ -6,6 +6,7 @@ preserve
 #  include "pycore_gc.h"          // PyGC_Head
 #  include "pycore_runtime.h"     // _Py_ID()
 #endif
+#include "pycore_critical_section.h"// Py_BEGIN_CRITICAL_SECTION()
 #include "pycore_modsupport.h"    // _PyArg_CheckPositional()
 
 PyDoc_STRVAR(_lsprof_Profiler_getstats__doc__,
@@ -45,11 +46,18 @@ _lsprof_Profiler_getstats_impl(ProfilerObject *self, PyTypeObject *cls);
 static PyObject *
 _lsprof_Profiler_getstats(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
+    PyObject *return_value = NULL;
+
     if (nargs || (kwnames && PyTuple_GET_SIZE(kwnames))) {
         PyErr_SetString(PyExc_TypeError, "getstats() takes no arguments");
-        return NULL;
+        goto exit;
     }
-    return _lsprof_Profiler_getstats_impl((ProfilerObject *)self, cls);
+    Py_BEGIN_CRITICAL_SECTION(self);
+    return_value = _lsprof_Profiler_getstats_impl((ProfilerObject *)self, cls);
+    Py_END_CRITICAL_SECTION();
+
+exit:
+    return return_value;
 }
 
 PyDoc_STRVAR(_lsprof_Profiler__pystart_callback__doc__,
@@ -76,7 +84,9 @@ _lsprof_Profiler__pystart_callback(PyObject *self, PyObject *const *args, Py_ssi
     }
     code = args[0];
     instruction_offset = args[1];
+    Py_BEGIN_CRITICAL_SECTION(self);
     return_value = _lsprof_Profiler__pystart_callback_impl((ProfilerObject *)self, code, instruction_offset);
+    Py_END_CRITICAL_SECTION();
 
 exit:
     return return_value;
@@ -109,7 +119,9 @@ _lsprof_Profiler__pythrow_callback(PyObject *self, PyObject *const *args, Py_ssi
     code = args[0];
     instruction_offset = args[1];
     exception = args[2];
+    Py_BEGIN_CRITICAL_SECTION(self);
     return_value = _lsprof_Profiler__pythrow_callback_impl((ProfilerObject *)self, code, instruction_offset, exception);
+    Py_END_CRITICAL_SECTION();
 
 exit:
     return return_value;
@@ -143,7 +155,9 @@ _lsprof_Profiler__pyreturn_callback(PyObject *self, PyObject *const *args, Py_ss
     code = args[0];
     instruction_offset = args[1];
     retval = args[2];
+    Py_BEGIN_CRITICAL_SECTION(self);
     return_value = _lsprof_Profiler__pyreturn_callback_impl((ProfilerObject *)self, code, instruction_offset, retval);
+    Py_END_CRITICAL_SECTION();
 
 exit:
     return return_value;
@@ -178,7 +192,9 @@ _lsprof_Profiler__ccall_callback(PyObject *self, PyObject *const *args, Py_ssize
     instruction_offset = args[1];
     callable = args[2];
     self_arg = args[3];
+    Py_BEGIN_CRITICAL_SECTION(self);
     return_value = _lsprof_Profiler__ccall_callback_impl((ProfilerObject *)self, code, instruction_offset, callable, self_arg);
+    Py_END_CRITICAL_SECTION();
 
 exit:
     return return_value;
@@ -215,7 +231,9 @@ _lsprof_Profiler__creturn_callback(PyObject *self, PyObject *const *args, Py_ssi
     instruction_offset = args[1];
     callable = args[2];
     self_arg = args[3];
+    Py_BEGIN_CRITICAL_SECTION(self);
     return_value = _lsprof_Profiler__creturn_callback_impl((ProfilerObject *)self, code, instruction_offset, callable, self_arg);
+    Py_END_CRITICAL_SECTION();
 
 exit:
     return return_value;
@@ -299,7 +317,9 @@ _lsprof_Profiler_enable(PyObject *self, PyObject *const *args, Py_ssize_t nargs,
         goto exit;
     }
 skip_optional_pos:
+    Py_BEGIN_CRITICAL_SECTION(self);
     return_value = _lsprof_Profiler_enable_impl((ProfilerObject *)self, subcalls, builtins);
+    Py_END_CRITICAL_SECTION();
 
 exit:
     return return_value;
@@ -320,7 +340,13 @@ _lsprof_Profiler_disable_impl(ProfilerObject *self);
 static PyObject *
 _lsprof_Profiler_disable(PyObject *self, PyObject *Py_UNUSED(ignored))
 {
-    return _lsprof_Profiler_disable_impl((ProfilerObject *)self);
+    PyObject *return_value = NULL;
+
+    Py_BEGIN_CRITICAL_SECTION(self);
+    return_value = _lsprof_Profiler_disable_impl((ProfilerObject *)self);
+    Py_END_CRITICAL_SECTION();
+
+    return return_value;
 }
 
 PyDoc_STRVAR(_lsprof_Profiler_clear__doc__,
@@ -338,7 +364,13 @@ _lsprof_Profiler_clear_impl(ProfilerObject *self);
 static PyObject *
 _lsprof_Profiler_clear(PyObject *self, PyObject *Py_UNUSED(ignored))
 {
-    return _lsprof_Profiler_clear_impl((ProfilerObject *)self);
+    PyObject *return_value = NULL;
+
+    Py_BEGIN_CRITICAL_SECTION(self);
+    return_value = _lsprof_Profiler_clear_impl((ProfilerObject *)self);
+    Py_END_CRITICAL_SECTION();
+
+    return return_value;
 }
 
 PyDoc_STRVAR(profiler_init__doc__,
@@ -444,4 +476,4 @@ profiler_init(PyObject *self, PyObject *args, PyObject *kwargs)
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=9e46985561166c37 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=af26a0b0ddcc3351 input=a9049054013a1b77]*/
diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index dcaadb818e0bf7..8c9d463ad903ec 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -628,6 +628,7 @@ is_writable(mmap_object *self)
     return 0;
 }
 
+#if defined(MS_WINDOWS) || defined(HAVE_MREMAP)
 static int
 is_resizeable(mmap_object *self)
 {
@@ -648,6 +649,7 @@ is_resizeable(mmap_object *self)
     return 0;
 
 }
+#endif /* MS_WINDOWS || HAVE_MREMAP */
 
 
 static PyObject *
@@ -766,6 +768,7 @@ mmap_size_method(PyObject *op, PyObject *Py_UNUSED(ignored))
  / new size?
  */
 
+#if defined(MS_WINDOWS) || defined(HAVE_MREMAP)
 static PyObject *
 mmap_resize_method(PyObject *op, PyObject *args)
 {
@@ -880,11 +883,6 @@ mmap_resize_method(PyObject *op, PyObject *args)
 #endif /* MS_WINDOWS */
 
 #ifdef UNIX
-#ifndef HAVE_MREMAP
-        PyErr_SetString(PyExc_SystemError,
-                        "mmap: resizing not available--no mremap()");
-        return NULL;
-#else
         void *newmap;
 
 #ifdef __linux__
@@ -916,10 +914,10 @@ mmap_resize_method(PyObject *op, PyObject *args)
         self->data = newmap;
         self->size = new_size;
         Py_RETURN_NONE;
-#endif /* HAVE_MREMAP */
 #endif /* UNIX */
     }
 }
+#endif /* MS_WINDOWS || HAVE_MREMAP */
 
 static PyObject *
 mmap_tell_method(PyObject *op, PyObject *Py_UNUSED(ignored))
@@ -1207,7 +1205,9 @@ static struct PyMethodDef mmap_object_methods[] = {
     {"read",            mmap_read_method,         METH_VARARGS},
     {"read_byte",       mmap_read_byte_method,    METH_NOARGS},
     {"readline",        mmap_read_line_method,    METH_NOARGS},
+#if defined(MS_WINDOWS) || defined(HAVE_MREMAP)
     {"resize",          mmap_resize_method,       METH_VARARGS},
+#endif
     {"seek",            mmap_seek_method,         METH_VARARGS},
     {"seekable",        mmap_seekable_method,     METH_NOARGS},
     {"size",            mmap_size_method,         METH_NOARGS},