py-bt-linked.py
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Authored by zhuyifei1999 on Feb 23 2020, 11:08 PM.

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	F31628183: raw.txt
	Feb 23 2020, 11:08 PM

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	# adapted some code from https://github.com/python/cpython/blob/2.7/Tools/gdb/libpython.py

	class PyBtLinked(gdb.Command):
	def __init__(self):
	gdb.Command.__init__ (self,
	"py-bt-linked",
	gdb.COMMAND_STACK,
	gdb.COMPLETE_NONE)


	def invoke(self, args, from_tty):
	try:
	print('Traceback (most recent call first):')

	def p_stack(filename, lineno, funcname):
	print(' File "{}", line {}, in {}'.format(
	filename if filename is not None else '<possibly built-in>',
	lineno, funcname))

	if filename is not None:
	import os
	try:
	cwd = os.readlink('/proc/{}/cwd'.format(gdb.selected_inferior().pid))
	except IOError:
	pass
	else:
	filename = os.path.join(cwd, filename)

	try:
	file = open(filename, 'rb')
	except IOError:
	print(' <can\'t open "{}">'.format(filename))
	else:
	with file:
	print(' ' +
	file.read().split(b'\n')[int(lineno)-1]
	.decode('utf-8').strip())

	def pystr(pystrptr):
	assert pystrptr['ob_type']['tp_name'].string() == 'str'
	pystrptr = pystrptr.cast(gdb.lookup_type('PyStringObject').pointer())
	field_ob_size = int(pystrptr['ob_size'])
	field_ob_sval = pystrptr['ob_sval']
	return ''.join(chr(field_ob_sval[i]) for i in range(field_ob_size))

	def addr2line(code, addrq):
	co_lnotab = pystr(code['co_lnotab'])
	lineno = int(code['co_firstlineno'])

	addr = 0
	for addr_incr, line_incr in zip(co_lnotab[::2], co_lnotab[1::2]):
	addr += ord(addr_incr)
	if addr > addrq:
	return lineno
	lineno += ord(line_incr)
	return lineno

	filename, lineno = None, '?'

	frame = None

	gdbframe = gdb.newest_frame()
	while not frame:
	gdbframe = gdbframe.older()

	regs = ['rax', 'rbx', 'rcx', 'rdx', 'rsi', 'rdi', 'rbp', 'r8', 'r9', 'r10', 'r11', 'r12', 'r13', 'r14', 'r15']
	for reg in regs:
	r = gdbframe.read_register(reg)
	try:
	r = r.cast(gdb.lookup_type('PyFrameObject').pointer())
	if r['ob_type']['tp_name'].string() == 'frame':
	frame = r
	except Exception:
	continue

	while frame:
	code = frame['f_code']
	filename = pystr(code['co_filename'])
	lineno = addr2line(code, int(frame['f_lasti']))
	funcname = pystr(code['co_name'])

	p_stack(filename, lineno, funcname)

	frame = frame['f_back']
	except Exception:
	import traceback
	traceback.print_exc()

	PyBtLinked()

Event Timeline

zhuyifei1999 created this paste.Feb 23 2020, 11:08 PM

zhuyifei1999 mentioned this in T245426: Earwig's copyvio tool 504 gateway time-out issues.

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