diff --git a/Lib/test/test_descr.py b/Lib/test/test_descr.py
index 88d120a427f..4e04371f626 100644
--- a/Lib/test/test_descr.py
+++ b/Lib/test/test_descr.py
@@ -4961,7 +4961,6 @@ class OverrideBoth(OverrideNew, OverrideInit):
             self.assertRaises(TypeError, case, 1, 2, 3)
             self.assertRaises(TypeError, case, 1, 2, foo=3)
 
-    @unittest.expectedFailure # TODO: RUSTPYTHON
     def test_subclassing_does_not_duplicate_dict_descriptors(self):
         class Base:
             pass
diff --git a/Lib/test/test_file_eintr.py b/Lib/test/test_file_eintr.py
index 55cc31dc59f..13260b8e498 100644
--- a/Lib/test/test_file_eintr.py
+++ b/Lib/test/test_file_eintr.py
@@ -152,7 +152,6 @@ def _test_reading(self, data_to_write, read_and_verify_code):
                     '"got data %r\\nexpected %r" % (got, expected))'
             )
 
-    @unittest.expectedFailure # TODO: RUSTPYTHON
     def test_readline(self):
         """readline() must handle signals and not lose data."""
         self._test_reading(
@@ -161,7 +160,6 @@ def test_readline(self):
                         read_method_name='readline',
                         expected=b'hello, world!\n'))
 
-    @unittest.expectedFailure # TODO: RUSTPYTHON
     def test_readlines(self):
         """readlines() must handle signals and not lose data."""
         self._test_reading(
@@ -170,7 +168,6 @@ def test_readlines(self):
                         read_method_name='readlines',
                         expected=[b'hello\n', b'world!\n']))
 
-    @unittest.expectedFailure # TODO: RUSTPYTHON
     def test_readall(self):
         """readall() must handle signals and not lose data."""
         self._test_reading(
@@ -189,6 +186,19 @@ def test_readall(self):
 class CTestFileIOSignalInterrupt(TestFileIOSignalInterrupt, unittest.TestCase):
     modname = '_io'
 
+    # TODO: RUSTPYTHON - _io module uses _pyio internally, signal handling differs
+    @unittest.expectedFailure
+    def test_readline(self):
+        super().test_readline()
+
+    @unittest.expectedFailure
+    def test_readlines(self):
+        super().test_readlines()
+
+    @unittest.expectedFailure
+    def test_readall(self):
+        super().test_readall()
+
 class PyTestFileIOSignalInterrupt(TestFileIOSignalInterrupt, unittest.TestCase):
     modname = '_pyio'
 
@@ -200,7 +210,6 @@ def _generate_infile_setup_code(self):
                 'assert isinstance(infile, io.BufferedReader)' %
                 self.modname)
 
-    @unittest.expectedFailure # TODO: RUSTPYTHON
     def test_readall(self):
         """BufferedReader.read() must handle signals and not lose data."""
         self._test_reading(
@@ -212,6 +221,19 @@ def test_readall(self):
 class CTestBufferedIOSignalInterrupt(TestBufferedIOSignalInterrupt, unittest.TestCase):
     modname = '_io'
 
+    # TODO: RUSTPYTHON - _io module uses _pyio internally, signal handling differs
+    @unittest.expectedFailure
+    def test_readline(self):
+        super().test_readline()
+
+    @unittest.expectedFailure
+    def test_readlines(self):
+        super().test_readlines()
+
+    @unittest.expectedFailure
+    def test_readall(self):
+        super().test_readall()
+
 class PyTestBufferedIOSignalInterrupt(TestBufferedIOSignalInterrupt, unittest.TestCase):
     modname = '_pyio'
 
@@ -224,7 +246,6 @@ def _generate_infile_setup_code(self):
                 'assert isinstance(infile, io.TextIOWrapper)' %
                 self.modname)
 
-    @unittest.expectedFailure # TODO: RUSTPYTHON
     def test_readline(self):
         """readline() must handle signals and not lose data."""
         self._test_reading(
@@ -233,7 +254,6 @@ def test_readline(self):
                         read_method_name='readline',
                         expected='hello, world!\n'))
 
-    @unittest.expectedFailure # TODO: RUSTPYTHON
     def test_readlines(self):
         """readlines() must handle signals and not lose data."""
         self._test_reading(
@@ -242,7 +262,6 @@ def test_readlines(self):
                         read_method_name='readlines',
                         expected=['hello\n', 'world!\n']))
 
-    @unittest.expectedFailure # TODO: RUSTPYTHON
     def test_readall(self):
         """read() must handle signals and not lose data."""
         self._test_reading(
@@ -254,6 +273,19 @@ def test_readall(self):
 class CTestTextIOSignalInterrupt(TestTextIOSignalInterrupt, unittest.TestCase):
     modname = '_io'
 
+    # TODO: RUSTPYTHON - _io module uses _pyio internally, signal handling differs
+    @unittest.expectedFailure
+    def test_readline(self):
+        super().test_readline()
+
+    @unittest.expectedFailure
+    def test_readlines(self):
+        super().test_readlines()
+
+    @unittest.expectedFailure
+    def test_readall(self):
+        super().test_readall()
+
 class PyTestTextIOSignalInterrupt(TestTextIOSignalInterrupt, unittest.TestCase):
     modname = '_pyio'
 
diff --git a/Lib/test/test_signal.py b/Lib/test/test_signal.py
index 34ef13adf33..58b3e55d321 100644
--- a/Lib/test/test_signal.py
+++ b/Lib/test/test_signal.py
@@ -24,8 +24,6 @@
 
 class GenericTests(unittest.TestCase):
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_enums(self):
         for name in dir(signal):
             sig = getattr(signal, name)
@@ -763,8 +761,6 @@ def handler(signum, frame):
                                     % (exitcode, stdout))
                 return (exitcode == 3)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_without_siginterrupt(self):
         # If a signal handler is installed and siginterrupt is not called
         # at all, when that signal arrives, it interrupts a syscall that's in
@@ -772,8 +768,6 @@ def test_without_siginterrupt(self):
         interrupted = self.readpipe_interrupted(None)
         self.assertTrue(interrupted)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_siginterrupt_on(self):
         # If a signal handler is installed and siginterrupt is called with
         # a true value for the second argument, when that signal arrives, it
diff --git a/Lib/test/test_socket.py b/Lib/test/test_socket.py
index 5ccbfa7ff83..d5a35a3253e 100644
--- a/Lib/test/test_socket.py
+++ b/Lib/test/test_socket.py
@@ -2052,8 +2052,6 @@ def test_socket_fileno_requires_socket_fd(self):
                     fileno=afile.fileno())
             self.assertEqual(cm.exception.errno, errno.ENOTSOCK)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_addressfamily_enum(self):
         import _socket, enum
         CheckedAddressFamily = enum._old_convert_(
@@ -2063,8 +2061,6 @@ def test_addressfamily_enum(self):
                 )
         enum._test_simple_enum(CheckedAddressFamily, socket.AddressFamily)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_socketkind_enum(self):
         import _socket, enum
         CheckedSocketKind = enum._old_convert_(
@@ -2074,8 +2070,6 @@ def test_socketkind_enum(self):
                 )
         enum._test_simple_enum(CheckedSocketKind, socket.SocketKind)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_msgflag_enum(self):
         import _socket, enum
         CheckedMsgFlag = enum._old_convert_(
@@ -2085,8 +2079,6 @@ def test_msgflag_enum(self):
                 )
         enum._test_simple_enum(CheckedMsgFlag, socket.MsgFlag)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_addressinfo_enum(self):
         import _socket, enum
         CheckedAddressInfo = enum._old_convert_(
diff --git a/Lib/test/test_ssl.py b/Lib/test/test_ssl.py
index f073def5bc1..09d35a77a1c 100644
--- a/Lib/test/test_ssl.py
+++ b/Lib/test/test_ssl.py
@@ -5477,7 +5477,6 @@ class Checked_TLSMessageType(enum.IntEnum):
             CHANGE_CIPHER_SPEC = 0x0101
         enum._test_simple_enum(Checked_TLSMessageType, _TLSMessageType)
 
-    @unittest.expectedFailure  # TODO: RUSTPYTHON
     def test_sslmethod(self):
         Checked_SSLMethod = enum._old_convert_(
                 enum.IntEnum, '_SSLMethod', 'ssl',
@@ -5488,7 +5487,6 @@ def test_sslmethod(self):
         Checked_SSLMethod.PROTOCOL_SSLv23 = Checked_SSLMethod.PROTOCOL_TLS
         enum._test_simple_enum(Checked_SSLMethod, ssl._SSLMethod)
 
-    @unittest.expectedFailure  # TODO: RUSTPYTHON
     def test_options(self):
         CheckedOptions = enum._old_convert_(
                 enum.IntFlag, 'Options', 'ssl',
@@ -5497,7 +5495,6 @@ def test_options(self):
                 )
         enum._test_simple_enum(CheckedOptions, ssl.Options)
 
-    @unittest.expectedFailure  # TODO: RUSTPYTHON
     def test_alertdescription(self):
         CheckedAlertDescription = enum._old_convert_(
                 enum.IntEnum, 'AlertDescription', 'ssl',
@@ -5506,7 +5503,6 @@ def test_alertdescription(self):
                 )
         enum._test_simple_enum(CheckedAlertDescription, ssl.AlertDescription)
 
-    @unittest.expectedFailure  # TODO: RUSTPYTHON
     def test_sslerrornumber(self):
         Checked_SSLErrorNumber = enum._old_convert_(
                 enum.IntEnum, 'SSLErrorNumber', 'ssl',
@@ -5515,7 +5511,6 @@ def test_sslerrornumber(self):
                 )
         enum._test_simple_enum(Checked_SSLErrorNumber, ssl.SSLErrorNumber)
 
-    @unittest.expectedFailure  # TODO: RUSTPYTHON
     def test_verifyflags(self):
         CheckedVerifyFlags = enum._old_convert_(
                 enum.IntFlag, 'VerifyFlags', 'ssl',
@@ -5524,7 +5519,6 @@ def test_verifyflags(self):
                 )
         enum._test_simple_enum(CheckedVerifyFlags, ssl.VerifyFlags)
 
-    @unittest.expectedFailure  # TODO: RUSTPYTHON
     def test_verifymode(self):
         CheckedVerifyMode = enum._old_convert_(
                 enum.IntEnum, 'VerifyMode', 'ssl',
diff --git a/crates/vm/src/builtins/type.rs b/crates/vm/src/builtins/type.rs
index de34678ae45..86d871fe30f 100644
--- a/crates/vm/src/builtins/type.rs
+++ b/crates/vm/src/builtins/type.rs
@@ -1499,9 +1499,15 @@ impl Constructor for PyType {
         // Only add if:
         // 1. base is not type (type subclasses inherit __dict__ from type)
         // 2. the class has HAS_DICT flag (i.e., __slots__ was not defined or __dict__ is in __slots__)
+        // 3. no base class in MRO already provides __dict__ descriptor
         if !base_is_type && typ.slots.flags.has_feature(PyTypeFlags::HAS_DICT) {
             let __dict__ = identifier!(vm, __dict__);
-            if !typ.attributes.read().contains_key(&__dict__) {
+            let has_inherited_dict = typ
+                .mro
+                .read()
+                .iter()
+                .any(|base| base.attributes.read().contains_key(&__dict__));
+            if !typ.attributes.read().contains_key(&__dict__) && !has_inherited_dict {
                 unsafe {
                     let descriptor =
                         vm.ctx
diff --git a/crates/vm/src/stdlib/os.rs b/crates/vm/src/stdlib/os.rs
index 87080ff8e0f..28d4aeb3755 100644
--- a/crates/vm/src/stdlib/os.rs
+++ b/crates/vm/src/stdlib/os.rs
@@ -274,12 +274,21 @@ pub(super) mod _os {
     }
 
     #[pyfunction]
-    fn read(fd: crt_fd::Borrowed<'_>, n: usize, vm: &VirtualMachine) -> io::Result<PyBytesRef> {
+    fn read(fd: crt_fd::Borrowed<'_>, n: usize, vm: &VirtualMachine) -> PyResult<PyBytesRef> {
         let mut buffer = vec![0u8; n];
-        let n = crt_fd::read(fd, &mut buffer)?;
-        buffer.truncate(n);
-
-        Ok(vm.ctx.new_bytes(buffer))
+        loop {
+            match crt_fd::read(fd, &mut buffer) {
+                Ok(n) => {
+                    buffer.truncate(n);
+                    return Ok(vm.ctx.new_bytes(buffer));
+                }
+                Err(e) if e.raw_os_error() == Some(libc::EINTR) => {
+                    vm.check_signals()?;
+                    continue;
+                }
+                Err(e) => return Err(e.into_pyexception(vm)),
+            }
+        }
     }
 
     #[pyfunction]