bpo-30764: test_subprocess uses SuppressCrashReport (#2405)

bpo-30764, bpo-29335: test_child_terminated_in_stopped_state() of
test_subprocess now uses support.SuppressCrashReport() to prevent the
creation of a core dump on FreeBSD.

Lib/test/test_subprocess.py

@@ -2563,37 +2563,40 @@ class POSIXProcessTestCase(BaseTestCase):
             proc.communicate(timeout=999)
             mock_proc_stdin.close.assert_called_once_with()
 
-    @unittest.skipIf(not ctypes, 'ctypes module required.')
-    @unittest.skipIf(not sys.executable, 'Test requires sys.executable.')
+    @unittest.skipIf(not ctypes, 'ctypes module required')
+    @unittest.skipIf(not sys.executable, 'Test requires sys.executable')
     def test_child_terminated_in_stopped_state(self):
         """Test wait() behavior when waitpid returns WIFSTOPPED; issue29335."""
         PTRACE_TRACEME = 0  # From glibc and MacOS (PT_TRACE_ME).
         libc_name = ctypes.util.find_library('c')
         libc = ctypes.CDLL(libc_name)
         if not hasattr(libc, 'ptrace'):
-            raise unittest.SkipTest('ptrace() required.')
-        test_ptrace = subprocess.Popen(
-            [sys.executable, '-c', """if True:
+            raise unittest.SkipTest('ptrace() required')
+
+        code = textwrap.dedent(f"""
              import ctypes
+             import faulthandler
+             from test.support import SuppressCrashReport
+
              libc = ctypes.CDLL({libc_name!r})
              libc.ptrace({PTRACE_TRACEME}, 0, 0)
-             """.format(libc_name=libc_name, PTRACE_TRACEME=PTRACE_TRACEME)
-            ])
-        if test_ptrace.wait() != 0:
-            raise unittest.SkipTest('ptrace() failed - unable to test.')
-        child = subprocess.Popen(
-            [sys.executable, '-c', """if True:
-             import ctypes, faulthandler
-             libc = ctypes.CDLL({libc_name!r})
-             libc.ptrace({PTRACE_TRACEME}, 0, 0)
-             faulthandler._sigsegv()  # Crash the process.
-             """.format(libc_name=libc_name, PTRACE_TRACEME=PTRACE_TRACEME)
-            ])
+        """)
+
+        child = subprocess.Popen([sys.executable, '-c', code])
+        if child.wait() != 0:
+            raise unittest.SkipTest('ptrace() failed - unable to test')
+
+        code += textwrap.dedent(f"""
+             with SuppressCrashReport():
+                # Crash the process
+                faulthandler._sigsegv()
+        """)
+        child = subprocess.Popen([sys.executable, '-c', code])
         try:
             returncode = child.wait()
-        except Exception as e:
+        except:
             child.kill()  # Clean up the hung stopped process.
-            raise e
+            raise
         self.assertNotEqual(0, returncode)
         self.assertLess(returncode, 0)  # signal death, likely SIGSEGV.