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404cdc5a92
Issue #23848: On Windows, faulthandler.enable() now also installs an exception handler to dump the traceback of all Python threads on any Windows exception, not only on UNIX signals (SIGSEGV, SIGFPE, SIGABRT).
750 lines
25 KiB
Python
750 lines
25 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
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from test.support import script_helper
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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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MS_WINDOWS = (os.name == 'nt')
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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, fd=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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pass_fds = []
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if fd is not None:
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pass_fds.append(fd)
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with support.SuppressCrashReport():
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process = script_helper.spawn_python('-c', code, pass_fds=pass_fds)
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with process:
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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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elif fd is not None:
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self.assertEqual(output, '')
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os.lseek(fd, os.SEEK_SET, 0)
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with open(fd, "rb", closefd=False) as fp:
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output = fp.read()
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output = output.decode('ascii', 'backslashreplace')
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return output.splitlines(), exitcode
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def check_error(self, code, line_number, fatal_error, *,
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filename=None, all_threads=True, other_regex=None,
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fd=None, know_current_thread=True):
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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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if know_current_thread:
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header = 'Current thread 0x[0-9a-f]+'
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else:
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header = 'Thread 0x[0-9a-f]+'
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else:
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header = 'Stack'
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regex = """
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^{fatal_error}
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{header} \(most recent call first\):
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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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fatal_error=fatal_error,
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header=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=filename, fd=fd)
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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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def check_fatal_error(self, code, line_number, name_regex, **kw):
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fatal_error = 'Fatal Python error: %s' % name_regex
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self.check_error(code, line_number, fatal_error, **kw)
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def check_windows_exception(self, code, line_number, name_regex, **kw):
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fatal_error = 'Windows exception: %s' % name_regex
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self.check_error(code, line_number, fatal_error, **kw)
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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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if not MS_WINDOWS:
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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'
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'|Bus error'
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'|Illegal instruction)')
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else:
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self.check_windows_exception("""
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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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'access violation')
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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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@unittest.skipIf(not HAVE_THREADS, 'need threads')
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def test_fatal_error_c_thread(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._fatal_error_c_thread()
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""",
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3,
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'in new thread',
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know_current_thread=False)
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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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def test_fatal_error_without_gil(self):
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self.check_fatal_error("""
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import faulthandler
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faulthandler._fatal_error(b'xyz', True)
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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._sigsegv(True)
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""",
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3,
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'Segmentation fault')
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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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@unittest.skipIf(sys.platform == "win32",
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"subprocess doesn't support pass_fds on Windows")
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def test_enable_fd(self):
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with tempfile.TemporaryFile('wb+') as fp:
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fd = fp.fileno()
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self.check_fatal_error("""
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import faulthandler
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import sys
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faulthandler.enable(%s)
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faulthandler._sigsegv()
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""" % fd,
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4,
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'Segmentation fault',
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fd=fd)
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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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stderr = '\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 = filter(None, (sys.executable,
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"-E" if sys.flags.ignore_environment else "",
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"-c", code))
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env = os.environ.copy()
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env.pop("PYTHONFAULTHANDLER", None)
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# don't use assert_python_ok() because it always enables 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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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 = filter(None, (sys.executable,
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"-E" if sys.flags.ignore_environment else "",
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"-X", "faulthandler", "-c", code))
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env = os.environ.copy()
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env.pop("PYTHONFAULTHANDLER", None)
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# don't use assert_python_ok() because it always enables faulthandler
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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 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 enables 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=None, fd=None):
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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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filename = {filename!r}
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fd = {fd}
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def funcB():
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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=False)
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elif fd is not None:
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faulthandler.dump_traceback(fd,
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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=filename,
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fd=fd,
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)
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if filename:
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lineno = 9
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elif fd is not None:
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lineno = 12
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else:
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lineno = 14
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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 17 in funcA',
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' File "<string>", line 19 in <module>'
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]
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trace, exitcode = self.get_output(code, filename, fd)
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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()
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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=filename)
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@unittest.skipIf(sys.platform == "win32",
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"subprocess doesn't support pass_fds on Windows")
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def test_dump_traceback_fd(self):
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with tempfile.TemporaryFile('wb+') as fp:
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self.check_dump_traceback(fd=fp.fileno())
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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 0x[0-9a-f]+ \(most recent call first\):
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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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@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, loops=1,
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*, filename=None, fd=None):
|
|
"""
|
|
Check how many times the traceback is written in timeout x 2.5 seconds,
|
|
or timeout x 3.5 seconds if cancel is True: 1, 2 or 3 times depending
|
|
on repeat and cancel options.
|
|
|
|
Raise an error if the output doesn't match the expect format.
|
|
"""
|
|
timeout_str = str(datetime.timedelta(seconds=TIMEOUT))
|
|
code = """
|
|
import faulthandler
|
|
import time
|
|
import sys
|
|
|
|
timeout = {timeout}
|
|
repeat = {repeat}
|
|
cancel = {cancel}
|
|
loops = {loops}
|
|
filename = {filename!r}
|
|
fd = {fd}
|
|
|
|
def func(timeout, repeat, cancel, file, loops):
|
|
for loop in range(loops):
|
|
faulthandler.dump_traceback_later(timeout, repeat=repeat, file=file)
|
|
if cancel:
|
|
faulthandler.cancel_dump_traceback_later()
|
|
time.sleep(timeout * 5)
|
|
faulthandler.cancel_dump_traceback_later()
|
|
|
|
if filename:
|
|
file = open(filename, "wb")
|
|
elif fd is not None:
|
|
file = sys.stderr.fileno()
|
|
else:
|
|
file = None
|
|
func(timeout, repeat, cancel, file, loops)
|
|
if filename:
|
|
file.close()
|
|
"""
|
|
code = code.format(
|
|
timeout=TIMEOUT,
|
|
repeat=repeat,
|
|
cancel=cancel,
|
|
loops=loops,
|
|
filename=filename,
|
|
fd=fd,
|
|
)
|
|
trace, exitcode = self.get_output(code, filename)
|
|
trace = '\n'.join(trace)
|
|
|
|
if not cancel:
|
|
count = loops
|
|
if repeat:
|
|
count *= 2
|
|
header = r'Timeout \(%s\)!\nThread 0x[0-9a-f]+ \(most recent call first\):\n' % timeout_str
|
|
regex = expected_traceback(17, 26, header, min_count=count)
|
|
self.assertRegex(trace, regex)
|
|
else:
|
|
self.assertEqual(trace, '')
|
|
self.assertEqual(exitcode, 0)
|
|
|
|
def test_dump_traceback_later(self):
|
|
self.check_dump_traceback_later()
|
|
|
|
def test_dump_traceback_later_repeat(self):
|
|
self.check_dump_traceback_later(repeat=True)
|
|
|
|
def test_dump_traceback_later_cancel(self):
|
|
self.check_dump_traceback_later(cancel=True)
|
|
|
|
def test_dump_traceback_later_file(self):
|
|
with temporary_filename() as filename:
|
|
self.check_dump_traceback_later(filename=filename)
|
|
|
|
@unittest.skipIf(sys.platform == "win32",
|
|
"subprocess doesn't support pass_fds on Windows")
|
|
def test_dump_traceback_later_fd(self):
|
|
with tempfile.TemporaryFile('wb+') as fp:
|
|
self.check_dump_traceback_later(fd=fp.fileno())
|
|
|
|
def test_dump_traceback_later_twice(self):
|
|
self.check_dump_traceback_later(loops=2)
|
|
|
|
@unittest.skipIf(not hasattr(faulthandler, "register"),
|
|
"need faulthandler.register")
|
|
def check_register(self, filename=False, all_threads=False,
|
|
unregister=False, chain=False, fd=None):
|
|
"""
|
|
Register a handler displaying the traceback on a user signal. Raise the
|
|
signal and check the written traceback.
|
|
|
|
If chain is True, check that the previous signal handler is called.
|
|
|
|
Raise an error if the output doesn't match the expected format.
|
|
"""
|
|
signum = signal.SIGUSR1
|
|
code = """
|
|
import faulthandler
|
|
import os
|
|
import signal
|
|
import sys
|
|
|
|
all_threads = {all_threads}
|
|
signum = {signum}
|
|
unregister = {unregister}
|
|
chain = {chain}
|
|
filename = {filename!r}
|
|
fd = {fd}
|
|
|
|
def func(signum):
|
|
os.kill(os.getpid(), signum)
|
|
|
|
def handler(signum, frame):
|
|
handler.called = True
|
|
handler.called = False
|
|
|
|
if filename:
|
|
file = open(filename, "wb")
|
|
elif fd is not None:
|
|
file = sys.stderr.fileno()
|
|
else:
|
|
file = None
|
|
if chain:
|
|
signal.signal(signum, handler)
|
|
faulthandler.register(signum, file=file,
|
|
all_threads=all_threads, chain={chain})
|
|
if unregister:
|
|
faulthandler.unregister(signum)
|
|
func(signum)
|
|
if chain and not handler.called:
|
|
if file is not None:
|
|
output = file
|
|
else:
|
|
output = sys.stderr
|
|
print("Error: signal handler not called!", file=output)
|
|
exitcode = 1
|
|
else:
|
|
exitcode = 0
|
|
if filename:
|
|
file.close()
|
|
sys.exit(exitcode)
|
|
"""
|
|
code = code.format(
|
|
all_threads=all_threads,
|
|
signum=signum,
|
|
unregister=unregister,
|
|
chain=chain,
|
|
filename=filename,
|
|
fd=fd,
|
|
)
|
|
trace, exitcode = self.get_output(code, filename)
|
|
trace = '\n'.join(trace)
|
|
if not unregister:
|
|
if all_threads:
|
|
regex = 'Current thread 0x[0-9a-f]+ \(most recent call first\):\n'
|
|
else:
|
|
regex = 'Stack \(most recent call first\):\n'
|
|
regex = expected_traceback(14, 32, regex)
|
|
self.assertRegex(trace, regex)
|
|
else:
|
|
self.assertEqual(trace, '')
|
|
if unregister:
|
|
self.assertNotEqual(exitcode, 0)
|
|
else:
|
|
self.assertEqual(exitcode, 0)
|
|
|
|
def test_register(self):
|
|
self.check_register()
|
|
|
|
def test_unregister(self):
|
|
self.check_register(unregister=True)
|
|
|
|
def test_register_file(self):
|
|
with temporary_filename() as filename:
|
|
self.check_register(filename=filename)
|
|
|
|
@unittest.skipIf(sys.platform == "win32",
|
|
"subprocess doesn't support pass_fds on Windows")
|
|
def test_register_fd(self):
|
|
with tempfile.TemporaryFile('wb+') as fp:
|
|
self.check_register(fd=fp.fileno())
|
|
|
|
def test_register_threads(self):
|
|
self.check_register(all_threads=True)
|
|
|
|
def test_register_chain(self):
|
|
self.check_register(chain=True)
|
|
|
|
@contextmanager
|
|
def check_stderr_none(self):
|
|
stderr = sys.stderr
|
|
try:
|
|
sys.stderr = None
|
|
with self.assertRaises(RuntimeError) as cm:
|
|
yield
|
|
self.assertEqual(str(cm.exception), "sys.stderr is None")
|
|
finally:
|
|
sys.stderr = stderr
|
|
|
|
def test_stderr_None(self):
|
|
# Issue #21497: provide an helpful error if sys.stderr is None,
|
|
# instead of just an attribute error: "None has no attribute fileno".
|
|
with self.check_stderr_none():
|
|
faulthandler.enable()
|
|
with self.check_stderr_none():
|
|
faulthandler.dump_traceback()
|
|
if hasattr(faulthandler, 'dump_traceback_later'):
|
|
with self.check_stderr_none():
|
|
faulthandler.dump_traceback_later(1e-3)
|
|
if hasattr(faulthandler, "register"):
|
|
with self.check_stderr_none():
|
|
faulthandler.register(signal.SIGUSR1)
|
|
|
|
@unittest.skipUnless(MS_WINDOWS, 'specific to Windows')
|
|
def test_raise_exception(self):
|
|
for exc, name in (
|
|
('EXCEPTION_ACCESS_VIOLATION', 'access violation'),
|
|
('EXCEPTION_INT_DIVIDE_BY_ZERO', 'int divide by zero'),
|
|
('EXCEPTION_STACK_OVERFLOW', 'stack overflow'),
|
|
):
|
|
self.check_windows_exception(f"""
|
|
import faulthandler
|
|
faulthandler.enable()
|
|
faulthandler._raise_exception(faulthandler._{exc})
|
|
""",
|
|
3,
|
|
name)
|
|
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|