679 lines
24 KiB
Python
Executable File
679 lines
24 KiB
Python
Executable File
#!/usr/bin/env python
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"""Hang Analyzer
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A prototype hang analyzer for Evergreen integration to help investigate test timeouts
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1. Script supports taking dumps, and/or dumping a summary of useful information about a process
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2. Script will iterate through a list of interesting processes,
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and run the tools from step 1. The list of processes can be provided as an option.
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3. Java processes will be dumped using jstack, if available.
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Supports Linux, MacOS X, Solaris, and Windows.
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"""
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import StringIO
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import csv
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import glob
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import itertools
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import logging
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import os
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import platform
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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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import tempfile
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import time
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from distutils import spawn
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from optparse import OptionParser
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# Get relative imports to work when the package is not installed on the PYTHONPATH.
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if __name__ == "__main__" and __package__ is None:
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sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
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from buildscripts.resmokelib import core
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def call(a, logger):
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logger.info(str(a))
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process = subprocess.Popen(a, stdout=subprocess.PIPE)
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logger_pipe = core.pipe.LoggerPipe(logger, logging.INFO, process.stdout)
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logger_pipe.wait_until_started()
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ret = process.wait()
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logger_pipe.wait_until_finished()
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if ret != 0:
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logger.error("Bad exit code %d" % (ret))
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raise Exception()
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def callo(a, logger):
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logger.info("%s" % str(a))
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return subprocess.check_output(a)
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def find_program(prog, paths):
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"""Finds the specified program in env PATH, or tries a set of paths """
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loc = spawn.find_executable(prog)
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if loc is not None:
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return loc
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for loc in paths:
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p = os.path.join(loc, prog)
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if os.path.exists(p):
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return p
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return None
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def get_process_logger(debugger_output, pid, process_name):
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"""Returns the process logger from options specified."""
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process_logger = logging.Logger("process", level=logging.DEBUG)
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process_logger.mongo_process_filename = None
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if 'stdout' in debugger_output:
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handler = logging.StreamHandler(sys.stdout)
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handler.setFormatter(logging.Formatter(fmt="%(message)s"))
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process_logger.addHandler(handler)
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if 'file' in debugger_output:
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filename = "debugger_%s_%d.log" % (os.path.splitext(process_name)[0], pid)
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process_logger.mongo_process_filename = filename
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handler = logging.FileHandler(filename=filename, mode="w")
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handler.setFormatter(logging.Formatter(fmt="%(message)s"))
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process_logger.addHandler(handler)
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return process_logger
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class WindowsDumper(object):
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def __find_debugger(self, logger, debugger):
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"""Finds the installed debugger"""
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# We are looking for c:\Program Files (x86)\Windows Kits\8.1\Debuggers\x64
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cdb = spawn.find_executable(debugger)
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if cdb is not None:
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return cdb
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from win32com.shell import shell, shellcon
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# Cygwin via sshd does not expose the normal environment variables
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# Use the shell api to get the variable instead
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rootDir = shell.SHGetFolderPath(0, shellcon.CSIDL_PROGRAM_FILESX86, None, 0)
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for i in range(0, 2):
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pathToTest = os.path.join(rootDir, "Windows Kits", "8." + str(i), "Debuggers", "x64")
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logger.info("Checking for debugger in %s" % pathToTest)
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if(os.path.exists(pathToTest)):
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return os.path.join(pathToTest, debugger)
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return None
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def dump_info(self, root_logger, logger, pid, process_name, take_dump):
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"""Dump useful information to the console"""
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debugger = "cdb.exe"
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dbg = self.__find_debugger(root_logger, debugger)
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if dbg is None:
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root_logger.warning("Debugger %s not found, skipping dumping of %d" % (debugger, pid))
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return
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root_logger.info("Debugger %s, analyzing %s process with PID %d" % (dbg,
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process_name,
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pid))
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dump_command = ""
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if take_dump:
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# Dump to file, dump_<process name>_<pid>.mdmp
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dump_file = "dump_%s_%d.%s" % (os.path.splitext(process_name)[0],
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pid,
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self.get_dump_ext())
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dump_command = ".dump /ma %s" % dump_file
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root_logger.info("Dumping core to %s" % dump_file)
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cmds = [
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".symfix", # Fixup symbol path
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".symopt +0x10", # Enable line loading (off by default in CDB, on by default in WinDBG)
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".reload", # Reload symbols
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"!peb", # Dump current exe, & environment variables
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"lm", # Dump loaded modules
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dump_command,
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"!uniqstack -pn", # Dump All unique Threads with function arguments
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"!cs -l", # Dump all locked critical sections
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".detach", # Detach
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"q" # Quit
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]
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call([dbg, '-c', ";".join(cmds), '-p', str(pid)], logger)
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root_logger.info("Done analyzing %s process with PID %d" % (process_name, pid))
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def get_dump_ext(self):
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return "mdmp"
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class WindowsProcessList(object):
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def __find_ps(self):
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"""Finds tasklist """
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return os.path.join(os.environ["WINDIR"], "system32", "tasklist.exe")
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def dump_processes(self, logger):
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"""Get list of [Pid, Process Name]"""
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ps = self.__find_ps()
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logger.info("Getting list of processes using %s" % ps)
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ret = callo([ps, "/FO", "CSV"], logger)
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b = StringIO.StringIO(ret)
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csvReader = csv.reader(b)
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p = [[int(row[1]), row[0]] for row in csvReader if row[1] != "PID"]
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return p
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# LLDB dumper is for MacOS X
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class LLDBDumper(object):
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def __find_debugger(self, debugger):
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"""Finds the installed debugger"""
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return find_program(debugger, ['/usr/bin'])
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def dump_info(self, root_logger, logger, pid, process_name, take_dump):
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debugger = "lldb"
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dbg = self.__find_debugger(debugger)
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if dbg is None:
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root_logger.warning("Debugger %s not found, skipping dumping of %d" % (debugger, pid))
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return
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root_logger.info("Debugger %s, analyzing %s process with PID %d" % (dbg,
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process_name,
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pid))
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lldb_version = callo([dbg, "--version"], logger)
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logger.info(lldb_version)
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# Do we have the XCode or LLVM version of lldb?
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# Old versions of lldb do not work well when taking commands via a file
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# XCode (7.2): lldb-340.4.119
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# LLVM - lldb version 3.7.0 ( revision )
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if 'version' not in lldb_version:
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# We have XCode's lldb
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lldb_version = lldb_version[lldb_version.index("lldb-"):]
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lldb_version = lldb_version.replace('lldb-', '')
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lldb_major_version = int(lldb_version[:lldb_version.index('.')])
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if lldb_major_version < 340:
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logger.warning("Debugger lldb is too old, please upgrade to XCode 7.2")
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return
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dump_command = ""
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if take_dump:
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# Dump to file, dump_<process name>_<pid>.core
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dump_file = "dump_%s_%d.%s" % (process_name, pid, self.get_dump_ext())
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dump_command = "process save-core %s" % dump_file
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root_logger.info("Dumping core to %s" % dump_file)
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cmds = [
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"attach -p %d" % pid,
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"target modules list",
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"thread backtrace all",
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dump_command,
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"settings set interpreter.prompt-on-quit false",
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"quit",
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]
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tf = tempfile.NamedTemporaryFile()
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for c in cmds:
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tf.write(c + "\n")
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tf.flush()
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# Works on in MacOS 10.9 & later
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#call([dbg] + list( itertools.chain.from_iterable([['-o', b] for b in cmds])), logger)
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call(['cat', tf.name], logger)
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call([dbg, '--source', tf.name], logger)
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root_logger.info("Done analyzing %s process with PID %d" % (process_name, pid))
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def get_dump_ext(self):
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return "core"
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class DarwinProcessList(object):
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def __find_ps(self):
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"""Finds ps"""
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return find_program('ps', ['/bin'])
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def dump_processes(self, logger):
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"""Get list of [Pid, Process Name]"""
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ps = self.__find_ps()
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logger.info("Getting list of processes using %s" % ps)
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ret = callo([ps, "-axco", "pid,comm"], logger)
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b = StringIO.StringIO(ret)
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csvReader = csv.reader(b, delimiter=' ', quoting=csv.QUOTE_NONE, skipinitialspace=True)
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p = [[int(row[0]), row[1]] for row in csvReader if row[0] != "PID"]
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return p
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# GDB dumper is for Linux & Solaris
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class GDBDumper(object):
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def __find_debugger(self, debugger):
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"""Finds the installed debugger"""
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return find_program(debugger, ['/opt/mongodbtoolchain/gdb/bin', '/usr/bin'])
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def dump_info(self, root_logger, logger, pid, process_name, take_dump):
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debugger = "gdb"
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dbg = self.__find_debugger(debugger)
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if dbg is None:
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logger.warning("Debugger %s not found, skipping dumping of %d" % (debugger, pid))
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return
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root_logger.info("Debugger %s, analyzing %s process with PID %d" % (dbg,
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process_name,
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pid))
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dump_command = ""
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if take_dump:
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# Dump to file, dump_<process name>_<pid>.core
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dump_file = "dump_%s_%d.%s" % (process_name, pid, self.get_dump_ext())
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dump_command = "gcore %s" % dump_file
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root_logger.info("Dumping core to %s" % dump_file)
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call([dbg, "--version"], logger)
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script_dir = os.path.dirname(os.path.abspath(__file__))
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root_logger.info("dir %s" % script_dir)
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gdb_dir = os.path.join(script_dir, "gdb")
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mongo_script = os.path.join(gdb_dir, "mongo.py")
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mongo_printers_script = os.path.join(gdb_dir, "mongo_printers.py")
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mongo_lock_script = os.path.join(gdb_dir, "mongo_lock.py")
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stack_bt = ""
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source_mongo = "source %s" % mongo_script
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source_mongo_printers = "source %s" % mongo_printers_script
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source_mongo_lock = "source %s" % mongo_lock_script
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mongodb_dump_locks = "mongodb-dump-locks"
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mongodb_show_locks = "mongodb-show-locks"
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mongodb_uniqstack = "mongodb-uniqstack mongodb-bt-if-active"
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mongodb_waitsfor_graph = "mongodb-waitsfor-graph debugger_waitsfor_%s_%d.gv" % \
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(process_name, pid)
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mongodb_javascript_stack = "mongodb-javascript-stack"
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# SERVER-28415 - GDB on ARM can run out of virtual memory after Python modules are loaded
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if platform.processor() == "aarch64":
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stack_bt = "thread apply all bt"
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mongodb_uniqstack = ""
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# The following MongoDB python extensions do not run on Solaris.
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if sys.platform.startswith("sunos"):
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source_mongo_lock = ""
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# SERVER-28234 - GDB frame information not available on Solaris for a templatized
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# function
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mongodb_dump_locks = ""
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# SERVER-28373 - GDB thread-local variables not available on Solaris
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mongodb_show_locks = ""
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mongodb_waitsfor_graph = ""
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mongodb_javascript_stack = ""
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if not logger.mongo_process_filename:
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raw_stacks_commands = []
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else:
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base, ext = os.path.splitext(logger.mongo_process_filename)
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raw_stacks_filename = base + '_raw_stacks' + ext
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raw_stacks_commands = [
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'echo \\nWriting raw stacks to %s.\\n' % raw_stacks_filename,
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# This sends output to log file rather than stdout until we turn logging off.
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'set logging redirect on',
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'set logging file ' + raw_stacks_filename,
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'set logging on',
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'thread apply all bt',
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'set logging off',
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]
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cmds = [
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"set interactive-mode off",
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"set print thread-events off", # Python calls to gdb.parse_and_eval may cause threads
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# to start and finish. This suppresses those messages
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# from appearing in the return output.
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"file %s" % process_name, # Solaris must load the process to read the symbols.
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"attach %d" % pid,
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"info sharedlibrary",
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"info threads", # Dump a simple list of commands to get the thread name
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"set python print-stack full",
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] + raw_stacks_commands + [
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stack_bt,
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source_mongo,
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source_mongo_printers,
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source_mongo_lock,
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mongodb_uniqstack,
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dump_command,
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mongodb_dump_locks,
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mongodb_show_locks,
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mongodb_waitsfor_graph,
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mongodb_javascript_stack, # The mongodb-javascript-stack command executes code in
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# order to dump JavaScript backtraces and should therefore
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# be one of the last analysis commands.
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"set confirm off",
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"quit",
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]
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call([dbg, "--quiet", "--nx"] +
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list(itertools.chain.from_iterable([['-ex', b] for b in cmds])),
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logger)
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root_logger.info("Done analyzing %s process with PID %d" % (process_name, pid))
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def get_dump_ext(self):
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return "core"
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def _find_gcore(self):
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"""Finds the installed gcore"""
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dbg = "/usr/bin/gcore"
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if os.path.exists(dbg):
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return dbg
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return None
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class LinuxProcessList(object):
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def __find_ps(self):
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"""Finds ps"""
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return find_program('ps', ['/bin', '/usr/bin'])
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def dump_processes(self, logger):
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"""Get list of [Pid, Process Name]"""
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ps = self.__find_ps()
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logger.info("Getting list of processes using %s" % ps)
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call([ps, "--version"], logger)
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ret = callo([ps, "-eo", "pid,args"], logger)
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b = StringIO.StringIO(ret)
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csvReader = csv.reader(b, delimiter=' ', quoting=csv.QUOTE_NONE, skipinitialspace=True)
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p = [[int(row[0]), os.path.split(row[1])[1]] for row in csvReader if row[0] != "PID"]
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return p
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class SolarisProcessList(object):
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def __find_ps(self):
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"""Finds ps"""
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return find_program('ps', ['/bin', '/usr/bin'])
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def dump_processes(self, logger):
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"""Get list of [Pid, Process Name]"""
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ps = self.__find_ps()
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logger.info("Getting list of processes using %s" % ps)
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ret = callo([ps, "-eo", "pid,args"], logger)
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b = StringIO.StringIO(ret)
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csvReader = csv.reader(b, delimiter=' ', quoting=csv.QUOTE_NONE, skipinitialspace=True)
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p = [[int(row[0]), os.path.split(row[1])[1]] for row in csvReader if row[0] != "PID"]
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return p
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# jstack is a JDK utility
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class JstackDumper(object):
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def __find_debugger(self, debugger):
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"""Finds the installed jstack debugger"""
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return find_program(debugger, ['/usr/bin'])
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def dump_info(self, root_logger, logger, pid, process_name):
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"""Dump java thread stack traces to the console"""
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debugger = "jstack"
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jstack = self.__find_debugger(debugger)
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if jstack is None:
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logger.warning("Debugger %s not found, skipping dumping of %d" % (debugger, pid))
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return
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root_logger.info("Debugger %s, analyzing" % (jstack, process_name, pid))
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call([jstack, "-l", str(pid)], logger)
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root_logger.info("Done analyzing %s process with PID %d" % (process_name, pid))
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# jstack is a JDK utility
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class JstackWindowsDumper(object):
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def dump_info(self, root_logger, logger, pid, process_name):
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"""Dump java thread stack traces to the logger"""
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root_logger.warning("Debugger jstack not supported, skipping dumping of %d" % (pid))
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def get_hang_analyzers():
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dbg = None
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jstack = None
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ps = None
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if sys.platform.startswith("linux"):
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dbg = GDBDumper()
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jstack = JstackDumper()
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ps = LinuxProcessList()
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elif sys.platform.startswith("sunos"):
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dbg = GDBDumper()
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jstack = JstackDumper()
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ps = SolarisProcessList()
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elif os.name == 'nt' or (os.name == "posix" and sys.platform == "cygwin"):
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dbg = WindowsDumper()
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jstack = JstackWindowsDumper()
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ps = WindowsProcessList()
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elif sys.platform == "darwin":
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dbg = LLDBDumper()
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jstack = JstackDumper()
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ps = DarwinProcessList()
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return [ps, dbg, jstack]
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def check_dump_quota(quota, ext):
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"""Check if sum of the files with ext is within the specified quota in megabytes"""
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files = glob.glob("*." + ext)
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size_sum = 0
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for file_name in files:
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size_sum += os.path.getsize(file_name)
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return (size_sum <= quota)
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def signal_process(logger, pid, signalnum):
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"""Signal process with signal, N/A on Windows"""
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try:
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os.kill(pid, signalnum)
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logger.info("Waiting for process to report")
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time.sleep(5)
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except OSError, e:
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logger.error("Hit OS error trying to signal process: %s" % str(e))
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except AttributeError:
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logger.error("Cannot send signal to a process on Windows")
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# Basic procedure
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#
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# 1. Get a list of interesting processes
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# 2. Dump useful information or take dumps
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def main():
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root_logger = logging.Logger("hang_analyzer", level=logging.DEBUG)
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handler = logging.StreamHandler(sys.stdout)
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handler.setFormatter(logging.Formatter(fmt="%(message)s"))
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root_logger.addHandler(handler)
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root_logger.info("Python Version: %s" % sys.version)
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root_logger.info("OS: %s" % platform.platform())
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try:
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distro = platform.linux_distribution()
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root_logger.info("Linux Distribution: %s" % str(distro))
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except AttributeError:
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root_logger.warning("Cannot determine Linux distro since Python is too old")
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try:
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uid = os.getuid()
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root_logger.info("Current User: %s" % str(uid))
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current_login = os.getlogin()
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root_logger.info("Current Login: %s" % current_login)
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except OSError:
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root_logger.warning("Cannot determine Unix Current Login")
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except AttributeError:
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root_logger.warning("Cannot determine Unix Current Login, not supported on Windows")
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interesting_processes = ["mongo", "mongod", "mongos", "_test", "dbtest", "python", "java"]
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go_processes = []
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process_ids = []
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parser = OptionParser(description=__doc__)
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parser.add_option('-p', '--process-names',
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dest='process_names',
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help='Comma separated list of process names to analyze')
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parser.add_option('-g', '--go-process-names',
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dest='go_process_names',
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help='Comma separated list of go process names to analyze')
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parser.add_option('-d', '--process-ids',
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dest='process_ids',
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default=None,
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help='Comma separated list of process ids (PID) to analyze, overrides -p & -g')
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parser.add_option('-c', '--dump-core',
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dest='dump_core',
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action="store_true",
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default=False,
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help='Dump core file for each analyzed process')
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parser.add_option('-s', '--max-core-dumps-size',
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dest='max_core_dumps_size',
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default=10000,
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help='Maximum total size of core dumps to keep in megabytes')
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parser.add_option('-o', '--debugger-output',
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dest='debugger_output',
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action="append",
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choices=['file', 'stdout'],
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default=None,
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help="If 'stdout', then the debugger's output is written to the Python"
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" process's stdout. If 'file', then the debugger's output is written"
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" to a file named debugger_<process>_<pid>.log for each process it"
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" attaches to. This option can be specified multiple times on the"
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" command line to have the debugger's output written to multiple"
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" locations. By default, the debugger's output is written only to the"
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" Python process's stdout.")
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(options, args) = parser.parse_args()
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if options.debugger_output is None:
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options.debugger_output = ['stdout']
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if options.process_ids is not None:
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# process_ids is an int list of PIDs
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process_ids = [int(pid) for pid in options.process_ids.split(',')]
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if options.process_names is not None:
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interesting_processes = options.process_names.split(',')
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if options.go_process_names is not None:
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go_processes = options.go_process_names.split(',')
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interesting_processes += go_processes
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[ps, dbg, jstack] = get_hang_analyzers()
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if ps is None or (dbg is None and jstack is None):
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root_logger.warning("hang_analyzer.py: Unsupported platform: %s" % (sys.platform))
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exit(1)
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all_processes = ps.dump_processes(root_logger)
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# Canonicalize the process names to lowercase to handle cases where the name of the Python
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# process is /System/Library/.../Python on OS X and -p python is specified to hang_analyzer.py.
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all_processes = [(pid, process_name.lower()) for (pid, process_name) in all_processes]
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# Find all running interesting processes:
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# If a list of process_ids is supplied, match on that.
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# Otherwise, do a substring match on interesting_processes.
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if process_ids:
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processes = [(pid, pname) for (pid, pname) in all_processes
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if pid in process_ids and pid != os.getpid()]
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running_pids = set([pid for (pid, pname) in all_processes])
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missing_pids = set(process_ids) - running_pids
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if missing_pids:
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root_logger.warning("The following requested process ids are not running %s" %
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list(missing_pids))
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else:
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processes = [(pid, pname) for (pid, pname) in all_processes
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if any(pname.find(ip) >= 0 for ip in interesting_processes) and
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pid != os.getpid()]
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root_logger.info("Found %d interesting processes %s" % (len(processes), processes))
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max_dump_size_bytes = int(options.max_core_dumps_size) * 1024 * 1024
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# Dump all other processes including go programs, except python & java.
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for (pid, process_name) in [(p, pn) for (p, pn) in processes
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if not re.match("^(java|python)", pn)]:
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process_logger = get_process_logger(options.debugger_output, pid, process_name)
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dbg.dump_info(
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root_logger,
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process_logger,
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pid,
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process_name,
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options.dump_core and check_dump_quota(max_dump_size_bytes, dbg.get_dump_ext()))
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# Dump java processes using jstack.
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for (pid, process_name) in [(p, pn) for (p, pn) in processes if pn.startswith("java")]:
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process_logger = get_process_logger(options.debugger_output, pid, process_name)
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jstack.dump_info(root_logger, process_logger, pid, process_name)
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# Signal go processes to ensure they print out stack traces, and die on POSIX OSes.
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# On Windows, this will simply kill the process since python emulates SIGABRT as
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# TerminateProcess.
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# Note: The stacktrace output may be captured elsewhere (i.e. resmoke).
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for (pid, process_name) in [(p, pn) for (p, pn) in processes if pn in go_processes]:
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root_logger.info("Sending signal SIGABRT to go process %s with PID %d" % (process_name, pid))
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signal_process(root_logger, pid, signal.SIGABRT)
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# Dump python processes after signalling them.
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for (pid, process_name) in [(p, pn) for (p, pn) in processes if pn.startswith("python")]:
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root_logger.info("Sending signal SIGUSR1 to python process %s with PID %d" % (process_name, pid))
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signal_process(root_logger, pid, signal.SIGUSR1)
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process_logger = get_process_logger(options.debugger_output, pid, process_name)
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dbg.dump_info(
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root_logger,
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process_logger,
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pid,
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process_name,
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take_dump=False)
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root_logger.info("Done analyzing all processes for hangs")
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if __name__ == "__main__":
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main()
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