Issue #10478: Reentrant calls inside buffered IO objects (for example by

way of a signal handler) now raise a RuntimeError instead of freezing the
current process.

Lib/test/test_io.py

@@ -2653,12 +2653,50 @@ class SignalsTest(unittest.TestCase):
     def test_interrupted_write_text(self):
         self.check_interrupted_write("xy", b"xy", mode="w", encoding="ascii")
 
+    def check_reentrant_write(self, data, **fdopen_kwargs):
+        def on_alarm(*args):
+            # Will be called reentrantly from the same thread
+            wio.write(data)
+            1/0
+        signal.signal(signal.SIGALRM, on_alarm)
+        r, w = os.pipe()
+        wio = self.io.open(w, **fdopen_kwargs)
+        try:
+            signal.alarm(1)
+            # Either the reentrant call to wio.write() fails with RuntimeError,
+            # or the signal handler raises ZeroDivisionError.
+            with self.assertRaises((ZeroDivisionError, RuntimeError)) as cm:
+                while 1:
+                    for i in range(100):
+                        wio.write(data)
+                        wio.flush()
+                    # Make sure the buffer doesn't fill up and block further writes
+                    os.read(r, len(data) * 100)
+            exc = cm.exception
+            if isinstance(exc, RuntimeError):
+                self.assertTrue(str(exc).startswith("reentrant call"), str(exc))
+        finally:
+            wio.close()
+            os.close(r)
+
+    def test_reentrant_write_buffered(self):
+        self.check_reentrant_write(b"xy", mode="wb")
+
+    def test_reentrant_write_text(self):
+        self.check_reentrant_write("xy", mode="w", encoding="ascii")
+
+
 class CSignalsTest(SignalsTest):
     io = io
 
 class PySignalsTest(SignalsTest):
     io = pyio
 
+    # Handling reentrancy issues would slow down _pyio even more, so the
+    # tests are disabled.
+    test_reentrant_write_buffered = None
+    test_reentrant_write_text = None
+
 
 def test_main():
     tests = (CIOTest, PyIOTest,