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634 lines
21 KiB
Python
634 lines
21 KiB
Python
from contextlib import contextmanager
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import datetime
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import faulthandler
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import os
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import re
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import signal
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import subprocess
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import sys
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from test import support, script_helper
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from test.script_helper import assert_python_ok
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import tempfile
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import unittest
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from textwrap import dedent
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try:
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import threading
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HAVE_THREADS = True
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except ImportError:
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HAVE_THREADS = False
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try:
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import _testcapi
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except ImportError:
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_testcapi = None
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TIMEOUT = 0.5
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def expected_traceback(lineno1, lineno2, header, min_count=1):
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regex = header
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regex += ' File "<string>", line %s in func\n' % lineno1
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regex += ' File "<string>", line %s in <module>' % lineno2
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if 1 < min_count:
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return '^' + (regex + '\n') * (min_count - 1) + regex
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else:
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return '^' + regex + '$'
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@contextmanager
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def temporary_filename():
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filename = tempfile.mktemp()
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try:
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yield filename
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finally:
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support.unlink(filename)
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class FaultHandlerTests(unittest.TestCase):
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def get_output(self, code, filename=None):
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"""
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Run the specified code in Python (in a new child process) and read the
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output from the standard error or from a file (if filename is set).
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Return the output lines as a list.
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Strip the reference count from the standard error for Python debug
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build, and replace "Current thread 0x00007f8d8fbd9700" by "Current
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thread XXX".
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"""
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code = dedent(code).strip()
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with support.SuppressCrashReport():
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process = script_helper.spawn_python('-c', code)
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stdout, stderr = process.communicate()
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exitcode = process.wait()
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output = support.strip_python_stderr(stdout)
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output = output.decode('ascii', 'backslashreplace')
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if filename:
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self.assertEqual(output, '')
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with open(filename, "rb") as fp:
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output = fp.read()
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output = output.decode('ascii', 'backslashreplace')
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output = re.sub('Current thread 0x[0-9a-f]+',
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'Current thread XXX',
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output)
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return output.splitlines(), exitcode
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def check_fatal_error(self, code, line_number, name_regex,
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filename=None, all_threads=True, other_regex=None):
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"""
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Check that the fault handler for fatal errors is enabled and check the
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traceback from the child process output.
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Raise an error if the output doesn't match the expected format.
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"""
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if all_threads:
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header = 'Current thread XXX (most recent call first)'
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else:
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header = 'Stack (most recent call first)'
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regex = """
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^Fatal Python error: {name}
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{header}:
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File "<string>", line {lineno} in <module>
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"""
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regex = dedent(regex.format(
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lineno=line_number,
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name=name_regex,
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header=re.escape(header))).strip()
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if other_regex:
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regex += '|' + other_regex
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output, exitcode = self.get_output(code, filename)
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output = '\n'.join(output)
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self.assertRegex(output, regex)
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self.assertNotEqual(exitcode, 0)
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@unittest.skipIf(sys.platform.startswith('aix'),
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"the first page of memory is a mapped read-only on AIX")
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def test_read_null(self):
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self.check_fatal_error("""
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import faulthandler
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faulthandler.enable()
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faulthandler._read_null()
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""",
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3,
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# Issue #12700: Read NULL raises SIGILL on Mac OS X Lion
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'(?:Segmentation fault|Bus error|Illegal instruction)')
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def test_sigsegv(self):
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self.check_fatal_error("""
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import faulthandler
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faulthandler.enable()
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faulthandler._sigsegv()
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""",
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3,
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'Segmentation fault')
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def test_sigabrt(self):
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self.check_fatal_error("""
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import faulthandler
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faulthandler.enable()
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faulthandler._sigabrt()
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""",
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3,
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'Aborted')
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@unittest.skipIf(sys.platform == 'win32',
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"SIGFPE cannot be caught on Windows")
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def test_sigfpe(self):
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self.check_fatal_error("""
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import faulthandler
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faulthandler.enable()
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faulthandler._sigfpe()
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""",
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3,
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'Floating point exception')
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@unittest.skipIf(_testcapi is None, 'need _testcapi')
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@unittest.skipUnless(hasattr(signal, 'SIGBUS'), 'need signal.SIGBUS')
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def test_sigbus(self):
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self.check_fatal_error("""
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import _testcapi
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import faulthandler
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import signal
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faulthandler.enable()
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_testcapi.raise_signal(signal.SIGBUS)
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""",
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6,
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'Bus error')
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@unittest.skipIf(_testcapi is None, 'need _testcapi')
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@unittest.skipUnless(hasattr(signal, 'SIGILL'), 'need signal.SIGILL')
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def test_sigill(self):
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self.check_fatal_error("""
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import _testcapi
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import faulthandler
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import signal
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faulthandler.enable()
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_testcapi.raise_signal(signal.SIGILL)
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""",
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6,
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'Illegal instruction')
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def test_fatal_error(self):
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self.check_fatal_error("""
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import faulthandler
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faulthandler._fatal_error(b'xyz')
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""",
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2,
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'xyz')
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@unittest.skipIf(sys.platform.startswith('openbsd') and HAVE_THREADS,
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"Issue #12868: sigaltstack() doesn't work on "
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"OpenBSD if Python is compiled with pthread")
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@unittest.skipIf(not hasattr(faulthandler, '_stack_overflow'),
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'need faulthandler._stack_overflow()')
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def test_stack_overflow(self):
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self.check_fatal_error("""
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import faulthandler
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faulthandler.enable()
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faulthandler._stack_overflow()
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""",
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3,
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'(?:Segmentation fault|Bus error)',
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other_regex='unable to raise a stack overflow')
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def test_gil_released(self):
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self.check_fatal_error("""
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import faulthandler
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faulthandler.enable()
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faulthandler._read_null(True)
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""",
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3,
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'(?:Segmentation fault|Bus error|Illegal instruction)')
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def test_enable_file(self):
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with temporary_filename() as filename:
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self.check_fatal_error("""
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import faulthandler
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output = open({filename}, 'wb')
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faulthandler.enable(output)
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faulthandler._sigsegv()
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""".format(filename=repr(filename)),
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4,
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'Segmentation fault',
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filename=filename)
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def test_enable_single_thread(self):
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self.check_fatal_error("""
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import faulthandler
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faulthandler.enable(all_threads=False)
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faulthandler._sigsegv()
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""",
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3,
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'Segmentation fault',
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all_threads=False)
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def test_disable(self):
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code = """
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import faulthandler
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faulthandler.enable()
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faulthandler.disable()
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faulthandler._sigsegv()
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"""
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not_expected = 'Fatal Python error'
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stderr, exitcode = self.get_output(code)
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stder = '\n'.join(stderr)
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self.assertTrue(not_expected not in stderr,
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"%r is present in %r" % (not_expected, stderr))
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self.assertNotEqual(exitcode, 0)
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def test_is_enabled(self):
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orig_stderr = sys.stderr
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try:
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# regrtest may replace sys.stderr by io.StringIO object, but
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# faulthandler.enable() requires that sys.stderr has a fileno()
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# method
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sys.stderr = sys.__stderr__
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was_enabled = faulthandler.is_enabled()
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try:
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faulthandler.enable()
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self.assertTrue(faulthandler.is_enabled())
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faulthandler.disable()
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self.assertFalse(faulthandler.is_enabled())
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finally:
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if was_enabled:
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faulthandler.enable()
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else:
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faulthandler.disable()
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finally:
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sys.stderr = orig_stderr
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def test_disabled_by_default(self):
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# By default, the module should be disabled
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code = "import faulthandler; print(faulthandler.is_enabled())"
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args = (sys.executable, '-E', '-c', code)
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# don't use assert_python_ok() because it always enable faulthandler
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output = subprocess.check_output(args)
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self.assertEqual(output.rstrip(), b"False")
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def test_sys_xoptions(self):
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# Test python -X faulthandler
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code = "import faulthandler; print(faulthandler.is_enabled())"
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args = (sys.executable, "-E", "-X", "faulthandler", "-c", code)
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# don't use assert_python_ok() because it always enable faulthandler
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output = subprocess.check_output(args)
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self.assertEqual(output.rstrip(), b"True")
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def test_env_var(self):
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# empty env var
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code = "import faulthandler; print(faulthandler.is_enabled())"
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args = (sys.executable, "-c", code)
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env = os.environ.copy()
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env['PYTHONFAULTHANDLER'] = ''
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# don't use assert_python_ok() because it always enable faulthandler
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output = subprocess.check_output(args, env=env)
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self.assertEqual(output.rstrip(), b"False")
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# non-empty env var
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env = os.environ.copy()
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env['PYTHONFAULTHANDLER'] = '1'
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output = subprocess.check_output(args, env=env)
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self.assertEqual(output.rstrip(), b"True")
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def check_dump_traceback(self, filename):
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"""
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Explicitly call dump_traceback() function and check its output.
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Raise an error if the output doesn't match the expected format.
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"""
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code = """
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import faulthandler
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def funcB():
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if {has_filename}:
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with open({filename}, "wb") as fp:
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faulthandler.dump_traceback(fp, all_threads=False)
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else:
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faulthandler.dump_traceback(all_threads=False)
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def funcA():
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funcB()
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funcA()
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"""
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code = code.format(
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filename=repr(filename),
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has_filename=bool(filename),
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)
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if filename:
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lineno = 6
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else:
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lineno = 8
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expected = [
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'Stack (most recent call first):',
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' File "<string>", line %s in funcB' % lineno,
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' File "<string>", line 11 in funcA',
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' File "<string>", line 13 in <module>'
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]
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trace, exitcode = self.get_output(code, filename)
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self.assertEqual(trace, expected)
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self.assertEqual(exitcode, 0)
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def test_dump_traceback(self):
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self.check_dump_traceback(None)
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def test_dump_traceback_file(self):
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with temporary_filename() as filename:
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self.check_dump_traceback(filename)
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def test_truncate(self):
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maxlen = 500
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func_name = 'x' * (maxlen + 50)
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truncated = 'x' * maxlen + '...'
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code = """
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import faulthandler
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def {func_name}():
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faulthandler.dump_traceback(all_threads=False)
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{func_name}()
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"""
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code = code.format(
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func_name=func_name,
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)
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expected = [
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'Stack (most recent call first):',
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' File "<string>", line 4 in %s' % truncated,
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' File "<string>", line 6 in <module>'
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]
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trace, exitcode = self.get_output(code)
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self.assertEqual(trace, expected)
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self.assertEqual(exitcode, 0)
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@unittest.skipIf(not HAVE_THREADS, 'need threads')
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def check_dump_traceback_threads(self, filename):
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"""
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Call explicitly dump_traceback(all_threads=True) and check the output.
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Raise an error if the output doesn't match the expected format.
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"""
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code = """
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import faulthandler
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from threading import Thread, Event
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import time
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def dump():
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if {filename}:
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with open({filename}, "wb") as fp:
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faulthandler.dump_traceback(fp, all_threads=True)
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else:
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faulthandler.dump_traceback(all_threads=True)
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class Waiter(Thread):
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# avoid blocking if the main thread raises an exception.
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daemon = True
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def __init__(self):
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Thread.__init__(self)
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self.running = Event()
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self.stop = Event()
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def run(self):
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self.running.set()
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self.stop.wait()
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waiter = Waiter()
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waiter.start()
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waiter.running.wait()
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dump()
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waiter.stop.set()
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waiter.join()
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"""
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code = code.format(filename=repr(filename))
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output, exitcode = self.get_output(code, filename)
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output = '\n'.join(output)
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if filename:
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lineno = 8
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else:
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lineno = 10
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regex = """
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^Thread 0x[0-9a-f]+ \(most recent call first\):
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(?: File ".*threading.py", line [0-9]+ in [_a-z]+
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){{1,3}} File "<string>", line 23 in run
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File ".*threading.py", line [0-9]+ in _bootstrap_inner
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File ".*threading.py", line [0-9]+ in _bootstrap
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Current thread XXX \(most recent call first\):
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File "<string>", line {lineno} in dump
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File "<string>", line 28 in <module>$
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"""
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regex = dedent(regex.format(lineno=lineno)).strip()
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self.assertRegex(output, regex)
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self.assertEqual(exitcode, 0)
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def test_dump_traceback_threads(self):
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self.check_dump_traceback_threads(None)
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def test_dump_traceback_threads_file(self):
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with temporary_filename() as filename:
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self.check_dump_traceback_threads(filename)
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def _check_dump_traceback_later(self, repeat, cancel, filename, loops):
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"""
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Check how many times the traceback is written in timeout x 2.5 seconds,
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or timeout x 3.5 seconds if cancel is True: 1, 2 or 3 times depending
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on repeat and cancel options.
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Raise an error if the output doesn't match the expect format.
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"""
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timeout_str = str(datetime.timedelta(seconds=TIMEOUT))
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code = """
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import faulthandler
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import time
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def func(timeout, repeat, cancel, file, loops):
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for loop in range(loops):
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faulthandler.dump_traceback_later(timeout, repeat=repeat, file=file)
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if cancel:
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faulthandler.cancel_dump_traceback_later()
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time.sleep(timeout * 5)
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faulthandler.cancel_dump_traceback_later()
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timeout = {timeout}
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repeat = {repeat}
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cancel = {cancel}
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loops = {loops}
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if {has_filename}:
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file = open({filename}, "wb")
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else:
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file = None
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func(timeout, repeat, cancel, file, loops)
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if file is not None:
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file.close()
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"""
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code = code.format(
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timeout=TIMEOUT,
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repeat=repeat,
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cancel=cancel,
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loops=loops,
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has_filename=bool(filename),
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filename=repr(filename),
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)
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trace, exitcode = self.get_output(code, filename)
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trace = '\n'.join(trace)
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if not cancel:
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count = loops
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if repeat:
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count *= 2
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header = r'Timeout \(%s\)!\nThread 0x[0-9a-f]+ \(most recent call first\):\n' % timeout_str
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regex = expected_traceback(9, 20, header, min_count=count)
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self.assertRegex(trace, regex)
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else:
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self.assertEqual(trace, '')
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self.assertEqual(exitcode, 0)
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@unittest.skipIf(not hasattr(faulthandler, 'dump_traceback_later'),
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'need faulthandler.dump_traceback_later()')
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def check_dump_traceback_later(self, repeat=False, cancel=False,
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file=False, twice=False):
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if twice:
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loops = 2
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else:
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loops = 1
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if file:
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with temporary_filename() as filename:
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self._check_dump_traceback_later(repeat, cancel,
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filename, loops)
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else:
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self._check_dump_traceback_later(repeat, cancel, None, loops)
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def test_dump_traceback_later(self):
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self.check_dump_traceback_later()
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def test_dump_traceback_later_repeat(self):
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self.check_dump_traceback_later(repeat=True)
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def test_dump_traceback_later_cancel(self):
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self.check_dump_traceback_later(cancel=True)
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def test_dump_traceback_later_file(self):
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self.check_dump_traceback_later(file=True)
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def test_dump_traceback_later_twice(self):
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self.check_dump_traceback_later(twice=True)
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@unittest.skipIf(not hasattr(faulthandler, "register"),
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"need faulthandler.register")
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def check_register(self, filename=False, all_threads=False,
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unregister=False, chain=False):
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"""
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Register a handler displaying the traceback on a user signal. Raise the
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signal and check the written traceback.
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If chain is True, check that the previous signal handler is called.
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Raise an error if the output doesn't match the expected format.
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"""
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signum = signal.SIGUSR1
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code = """
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import faulthandler
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import os
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import signal
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import sys
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def func(signum):
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os.kill(os.getpid(), signum)
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def handler(signum, frame):
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handler.called = True
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handler.called = False
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exitcode = 0
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signum = {signum}
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unregister = {unregister}
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chain = {chain}
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if {has_filename}:
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file = open({filename}, "wb")
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else:
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file = None
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if chain:
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signal.signal(signum, handler)
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faulthandler.register(signum, file=file,
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all_threads={all_threads}, chain={chain})
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if unregister:
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faulthandler.unregister(signum)
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func(signum)
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if chain and not handler.called:
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if file is not None:
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output = file
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else:
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output = sys.stderr
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print("Error: signal handler not called!", file=output)
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exitcode = 1
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if file is not None:
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file.close()
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sys.exit(exitcode)
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"""
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code = code.format(
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filename=repr(filename),
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has_filename=bool(filename),
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all_threads=all_threads,
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signum=signum,
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unregister=unregister,
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chain=chain,
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)
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trace, exitcode = self.get_output(code, filename)
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trace = '\n'.join(trace)
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if not unregister:
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if all_threads:
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regex = 'Current thread XXX \(most recent call first\):\n'
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else:
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regex = 'Stack \(most recent call first\):\n'
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regex = expected_traceback(7, 28, regex)
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self.assertRegex(trace, regex)
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else:
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self.assertEqual(trace, '')
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if unregister:
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self.assertNotEqual(exitcode, 0)
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else:
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self.assertEqual(exitcode, 0)
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def test_register(self):
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self.check_register()
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def test_unregister(self):
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self.check_register(unregister=True)
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def test_register_file(self):
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with temporary_filename() as filename:
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self.check_register(filename=filename)
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def test_register_threads(self):
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self.check_register(all_threads=True)
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def test_register_chain(self):
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self.check_register(chain=True)
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@contextmanager
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def check_stderr_none(self):
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stderr = sys.stderr
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try:
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sys.stderr = None
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with self.assertRaises(RuntimeError) as cm:
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yield
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self.assertEqual(str(cm.exception), "sys.stderr is None")
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finally:
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sys.stderr = stderr
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def test_stderr_None(self):
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# Issue #21497: provide an helpful error if sys.stderr is None,
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# instead of just an attribute error: "None has no attribute fileno".
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with self.check_stderr_none():
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faulthandler.enable()
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with self.check_stderr_none():
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faulthandler.dump_traceback()
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if hasattr(faulthandler, 'dump_traceback_later'):
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with self.check_stderr_none():
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faulthandler.dump_traceback_later(1e-3)
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if hasattr(faulthandler, "register"):
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with self.check_stderr_none():
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faulthandler.register(signal.SIGUSR1)
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if __name__ == "__main__":
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unittest.main()
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