diff --git a/Lib/test/test_posix.py b/Lib/test/test_posix.py
index 8b3cbc2f0..eb0e4d25d 100644
--- a/Lib/test/test_posix.py
+++ b/Lib/test/test_posix.py
@@ -668,6 +668,19 @@ class PosixTester(unittest.TestCase):
         finally:
             fp.close()
 
+    @unittest.expectedFailure  # TODO: RUSTPYTHON
+    @unittest.skipUnless(hasattr(posix, 'stat'),
+                         'test needs posix.stat()')
+    @unittest.skipUnless(os.stat in os.supports_follow_symlinks,
+                         'test needs follow_symlinks support in os.stat()')
+    def test_stat_fd_zero_follow_symlinks(self):
+        with self.assertRaisesRegex(ValueError,
+                'cannot use fd and follow_symlinks together'):
+            posix.stat(0, follow_symlinks=False)
+        with self.assertRaisesRegex(ValueError,
+                'cannot use fd and follow_symlinks together'):
+            posix.stat(1, follow_symlinks=False)
+
     def test_stat(self):
         self.assertTrue(posix.stat(os_helper.TESTFN))
         self.assertTrue(posix.stat(os.fsencode(os_helper.TESTFN)))
@@ -1017,7 +1030,6 @@ class PosixTester(unittest.TestCase):
         target = self.tempdir()
         self.check_chmod(posix.chmod, target)
 
-    @unittest.skipIf(sys.platform in ("darwin", "linux"), "TODO: RUSTPYTHON; crash")
     @os_helper.skip_unless_working_chmod
     def test_fchmod_file(self):
         with open(os_helper.TESTFN, 'wb+') as f:
diff --git a/crates/vm/src/stdlib/posix.rs b/crates/vm/src/stdlib/posix.rs
index f873613d7..87c4fa5c8 100644
--- a/crates/vm/src/stdlib/posix.rs
+++ b/crates/vm/src/stdlib/posix.rs
@@ -1035,7 +1035,7 @@ pub mod module {
     fn _fchmod(fd: BorrowedFd<'_>, mode: u32, vm: &VirtualMachine) -> PyResult<()> {
         nix::sys::stat::fchmod(
             fd,
-            nix::sys::stat::Mode::from_bits(mode as libc::mode_t).unwrap(),
+            nix::sys::stat::Mode::from_bits_truncate(mode as libc::mode_t),
         )
         .map_err(|err| err.into_pyexception(vm))
     }
@@ -1404,12 +1404,7 @@ pub mod module {
     }
 
     // cfg from nix
-    #[cfg(any(
-        target_os = "android",
-        target_os = "freebsd",
-        target_os = "linux",
-        target_os = "openbsd"
-    ))]
+    #[cfg(any(target_os = "freebsd", target_os = "linux", target_os = "openbsd"))]
     #[pyfunction]
     fn setresgid(rgid: Gid, egid: Gid, sgid: Gid, vm: &VirtualMachine) -> PyResult<()> {
         unistd::setresgid(rgid, egid, sgid).map_err(|err| err.into_pyexception(vm))
@@ -1423,12 +1418,7 @@ pub mod module {
     }
 
     // cfg from nix
-    #[cfg(any(
-        target_os = "android",
-        target_os = "freebsd",
-        target_os = "linux",
-        target_os = "openbsd"
-    ))]
+    #[cfg(any(target_os = "freebsd", target_os = "linux", target_os = "openbsd"))]
     #[pyfunction]
     fn initgroups(user_name: PyUtf8StrRef, gid: Gid, vm: &VirtualMachine) -> PyResult<()> {
         let user = user_name.to_cstring(vm)?;