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# coding: utf-8
import os
import re
import glob
import socket
import logging
import platform
import subprocess
import six
from library.python.reservoir_sampling import reservoir_sampling
logger = logging.getLogger(__name__)
def _read_file(filename):
with open(filename) as afile:
return afile.read().strip("\n")
def recover_core_dump_file(binary_path, cwd, pid, core_pattern=None):
class CoreFilePattern(object):
def __init__(self, path, mask):
self.path = path
self.mask = mask
cwd = cwd or os.getcwd()
system = platform.system().lower()
if system.startswith("linux"):
import stat
import resource
logger.debug("hostname = '%s'", socket.gethostname())
logger.debug("rlimit_core = '%s'", str(resource.getrlimit(resource.RLIMIT_CORE)))
if core_pattern is None:
core_pattern = _read_file("/proc/sys/kernel/core_pattern")
logger.debug("core_pattern = '%s'", core_pattern)
if core_pattern.startswith("/"):
default_pattern = CoreFilePattern(os.path.dirname(core_pattern), '*')
else:
default_pattern = CoreFilePattern(cwd, '*')
def resolve_core_mask(core_mask):
def resolve(text):
if text == "%p":
return str(pid)
elif text == "%e":
# https://github.com/torvalds/linux/blob/7876320f88802b22d4e2daf7eb027dd14175a0f8/include/linux/sched.h#L847
# https://github.com/torvalds/linux/blob/7876320f88802b22d4e2daf7eb027dd14175a0f8/fs/coredump.c#L278
return os.path.basename(binary_path)[:15]
elif text == "%E":
return binary_path.replace("/", "!")
elif text == "%%":
return "%"
elif text.startswith("%"):
return "*"
return text
parts = filter(None, re.split(r"(%.)", core_mask))
return "".join([resolve(p) for p in parts])
# don't interpret a program for piping core dumps as a pattern
if core_pattern and not core_pattern.startswith("|"):
default_pattern.mask = os.path.basename(core_pattern)
else:
core_uses_pid = int(_read_file("/proc/sys/kernel/core_uses_pid"))
logger.debug("core_uses_pid = '%d'", core_uses_pid)
if core_uses_pid == 0:
default_pattern.mask = "core"
else:
default_pattern.mask = "core.%p"
# widely distributed core dump dir and mask (see DEVTOOLS-4408)
yandex_pattern = CoreFilePattern('/coredumps', '%e.%p.%s')
yandex_market_pattern = CoreFilePattern('/var/tmp/cores', 'core.%..%e.%s.%p.*')
for pattern in [default_pattern, yandex_pattern, yandex_market_pattern]:
pattern.mask = resolve_core_mask(pattern.mask)
if not os.path.exists(pattern.path):
logger.warning("Core dump dir doesn't exist: %s", pattern.path)
continue
logger.debug(
"Core dump dir (%s) permission mask: %s (expected: %s (%s-dir, %s-sticky bit))",
pattern.path,
oct(os.stat(pattern.path)[stat.ST_MODE]),
oct(stat.S_IFDIR | stat.S_ISVTX | 0o777),
oct(stat.S_IFDIR),
oct(stat.S_ISVTX),
)
logger.debug("Search for core dump files match pattern '%s' in '%s'", pattern.mask, pattern.path)
escaped_pattern_path = pattern.path
if six.PY3:
escaped_pattern_path = glob.escape(pattern.path)
cores = glob.glob(os.path.join(escaped_pattern_path, pattern.mask))
files = os.listdir(pattern.path)
logger.debug(
"Matched core dump files (%d/%d): [%s] (mismatched samples: %s)",
len(cores),
len(files),
", ".join(cores),
", ".join(reservoir_sampling(files, 5)),
)
if len(cores) == 1:
return cores[0]
elif len(cores) > 1:
stat = [(filename, os.stat(filename).st_mtime) for filename in cores]
entry = sorted(stat, key=lambda x: x[1])[-1]
logger.debug("Latest core dump file: '%s' with %d mtime", entry[0], entry[1])
return entry[0]
else:
logger.debug("Core dump file recovering is not supported on '%s'", system)
return None
def get_gdb_full_backtrace(binary, core, gdb_path):
cmd = [
gdb_path, binary, core,
"--eval-command", "set print thread-events off",
"--eval-command", "thread apply all backtrace full",
"--batch",
"--quiet",
]
proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
output, stderr = proc.communicate()
output = six.ensure_str(output)
if stderr:
output += "\nstderr >>\n" + six.ensure_str(stderr)
return output
def get_problem_stack(backtrace):
stack = []
found_thread1 = False
regex = re.compile(r'[Tt]hread (\d+)')
for line in backtrace.split("\n"):
match = regex.search(line)
if match:
if found_thread1:
break
if int(match.group(1)) == 1:
found_thread1 = True
if found_thread1:
stack.append(line)
if not stack:
return backtrace
return "\n".join(stack)
# XXX
def colorize_backtrace(text):
filters = [
# Function names and the class they belong to
(re.compile(r"^(#[0-9]+ .*?)([a-zA-Z0-9_:\.@]+)(\s?\()", flags=re.MULTILINE), r"\1[[c:cyan]]\2[[rst]]\3"),
# Function argument names
(re.compile(r"([a-zA-Z0-9_#]*)(\s?=\s?)"), r"[[c:green]]\1[[rst]]\2"),
# Stack frame number
(re.compile(r"^(#[0-9]+)", flags=re.MULTILINE), r"[[c:red]]\1[[rst]]"),
# Thread id colorization
(re.compile(r"^([ \*]) ([0-9]+)", flags=re.MULTILINE), r"[[c:light-cyan]]\1 [[c:red]]\2[[rst]]"),
# File path and line number
(re.compile(r"(\.*[/A-Za-z0-9\+_\.\-]*):(([0-9]+)(:[0-9]+)?)$", flags=re.MULTILINE), r"[[c:light-grey]]\1[[rst]]:[[c:magenta]]\2[[rst]]"),
# Addresses
(re.compile(r"\b(0x[a-f0-9]{6,})\b"), r"[[c:light-grey]]\1[[rst]]"),
]
for regex, substitution in filters:
text = regex.sub(substitution, text)
return text
def resolve_addresses(addresses, symbolizer, binary):
addresses = list(set(addresses))
cmd = [
symbolizer,
"-demangle",
"-obj",
binary,
]
proc = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out, err = proc.communicate(input="\n".join(addresses))
if proc.returncode:
raise Exception("Symbolizer failed with rc:{}\nstderr: {}".format(proc.returncode, err))
resolved = filter(None, out.split("\n\n"))
if len(addresses) != len(resolved):
raise Exception("llvm-symbolizer can not extract lines from addresses (count mismatch: {}-{})".format(len(addresses), len(resolved)))
return {k: v.strip(" \n") for k, v in zip(addresses, resolved)}
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