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330426cfe2
AIX maps the first page of memory at address zero as valid, read-only. Reading NULL is not a fault on AIX. This is utilized by IBM compiler optimizations. One speculatively can indirect through a pointer which may be null without first testing if null and defer the test before using the value.
598 lines
18 KiB
Python
598 lines
18 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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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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TIMEOUT = 0.5
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try:
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from resource import setrlimit, RLIMIT_CORE, error as resource_error
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except ImportError:
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prepare_subprocess = None
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else:
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def prepare_subprocess():
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# don't create core file
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try:
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setrlimit(RLIMIT_CORE, (0, 0))
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except (ValueError, resource_error):
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pass
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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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options = {}
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if prepare_subprocess:
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options['preexec_fn'] = prepare_subprocess
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process = script_helper.spawn_python('-c', code, **options)
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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'
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else:
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header = 'Traceback (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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""".strip()
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regex = regex.format(
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lineno=line_number,
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name=name_regex,
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header=re.escape(header))
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if other_regex:
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regex += '|' + other_regex
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with support.suppress_crash_popup():
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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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""".strip(),
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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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""".strip(),
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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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""".strip(),
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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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""".strip(),
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3,
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'Floating point exception')
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@unittest.skipIf(not hasattr(faulthandler, '_sigbus'),
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"need faulthandler._sigbus()")
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def test_sigbus(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._sigbus()
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""".strip(),
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3,
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'Bus error')
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@unittest.skipIf(not hasattr(faulthandler, '_sigill'),
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"need faulthandler._sigill()")
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def test_sigill(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._sigill()
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""".strip(),
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3,
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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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""".strip(),
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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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""".strip(),
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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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""".strip(),
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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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""".strip().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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""".strip(),
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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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""".strip()
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not_expected = 'Fatal Python error'
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with support.suppress_crash_popup():
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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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rc, stdout, stderr = assert_python_ok("-c", code)
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stdout = (stdout + stderr).strip()
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self.assertEqual(stdout, 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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rc, stdout, stderr = assert_python_ok("-X", "faulthandler", "-c", code)
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stdout = (stdout + stderr).strip()
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self.assertEqual(stdout, 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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""".strip()
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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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'Traceback (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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""".strip()
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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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'Traceback (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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""".strip()
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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]+:
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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:
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File "<string>", line {lineno} in dump
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File "<string>", line 28 in <module>$
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""".strip()
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regex = regex.format(lineno=lineno)
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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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""".strip()
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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]+:\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}:
|
|
file = open({filename}, "wb")
|
|
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
|
|
if file is not None:
|
|
file.close()
|
|
sys.exit(exitcode)
|
|
""".strip()
|
|
code = code.format(
|
|
filename=repr(filename),
|
|
has_filename=bool(filename),
|
|
all_threads=all_threads,
|
|
signum=signum,
|
|
unregister=unregister,
|
|
chain=chain,
|
|
)
|
|
trace, exitcode = self.get_output(code, filename)
|
|
trace = '\n'.join(trace)
|
|
if not unregister:
|
|
if all_threads:
|
|
regex = 'Current thread XXX:\n'
|
|
else:
|
|
regex = 'Traceback \(most recent call first\):\n'
|
|
regex = expected_traceback(7, 28, 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)
|
|
|
|
def test_register_threads(self):
|
|
self.check_register(all_threads=True)
|
|
|
|
def test_register_chain(self):
|
|
self.check_register(chain=True)
|
|
|
|
|
|
def test_main():
|
|
support.run_unittest(FaultHandlerTests)
|
|
|
|
if __name__ == "__main__":
|
|
test_main()
|