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549 lines
18 KiB
Python
Executable File
549 lines
18 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 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 threading
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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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if sys.platform == "win32":
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import win32process
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def call(a = []):
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sys.stdout.write(str(a) + "\n")
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sys.stdout.flush()
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ret = subprocess.call(a)
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if( ret != 0):
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sys.stderr.write("Bad exit code %d\n" % (ret))
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raise Exception()
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# Copied from python 2.7 version of subprocess.py
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def check_output(*popenargs, **kwargs):
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r"""Run command with arguments and return its output as a byte string.
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If the exit code was non-zero it raises a CalledProcessError. The
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CalledProcessError object will have the return code in the returncode
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attribute and output in the output attribute.
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The arguments are the same as for the Popen constructor. Example:
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>>> check_output(["ls", "-l", "/dev/null"])
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'crw-rw-rw- 1 root root 1, 3 Oct 18 2007 /dev/null\n'
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The stdout argument is not allowed as it is used internally.
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To capture standard error in the result, use stderr=STDOUT.
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>>> check_output(["/bin/sh", "-c",
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... "ls -l non_existent_file ; exit 0"],
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... stderr=STDOUT)
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'ls: non_existent_file: No such file or directory\n'
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"""
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if 'stdout' in kwargs:
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raise ValueError('stdout argument not allowed, it will be overridden.')
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process = subprocess.Popen(stdout=subprocess.PIPE, *popenargs, **kwargs)
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output, unused_err = process.communicate()
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retcode = process.poll()
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if retcode:
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cmd = kwargs.get("args")
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if cmd is None:
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cmd = popenargs[0]
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raise CalledProcessError(retcode, cmd, output=output)
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return output
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def callo(a = []):
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sys.stdout.write(str(a) + "\n")
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sys.stdout.flush()
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return 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 != 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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class WindowsDumper(object):
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def __find_debugger(self):
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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('cdb.exe')
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if(cdb != 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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sys.stdout.write("Checking for debugger in %s\n" % pathToTest)
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if(os.path.exists(pathToTest)):
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return os.path.join(pathToTest, "cdb.exe")
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return None
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def dump_info(self, pid, process_name, stream, take_dump = False):
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"""Dump useful information to the console"""
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dbg = self.__find_debugger()
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if dbg is None:
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stream.write("WARNING: Debugger cdb.exe not found, skipping dumping of %d\n" % (pid))
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return
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stream.write("INFO: Debugger %s, analyzing %d\n" % (dbg, pid))
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cmds = [
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".symfix", # Fixup symbol path
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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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"~* k 100", # Dump All Threads
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".dump /ma /u dump_" + process_name + "." + str(pid) + "." + self.get_dump_ext() if take_dump else "",
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# Dump to file, dump_<process name>_<time stamp>_<pid in hex>.<pid>.mdmp
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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)])
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stream.write("INFO: Done analyzing process\n")
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def get_dump_ext(self):
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return "mdmp"
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def dump_core(self, pid, output_file):
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"""Take a dump of pid to specified file"""
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dbg = self.__find_debugger()
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if dbg is None:
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sys.stdout.write("WARNING: Debugger cdb.exe not found, skipping dumping of %d to %s\n" % (pid, output_file))
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return
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sys.stdout.write("INFO: Debugger %s, analyzing %d to %s\n" % (dbg, pid, output_file))
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call([dbg, '-c', ".dump /ma %s;.detach;q" % output_file, '-p', str(pid)] )
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sys.stdout.write("INFO: Done analyzing process\n")
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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):
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"""Get list of [Pid, Process Name]"""
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ps = self.__find_ps()
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sys.stdout.write("INFO: Getting list of processes using %s\n" % ps)
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ret = callo([ps, "/FO", "CSV"])
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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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sys.stdout.write("INFO: Done analyzing process\n")
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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):
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"""Finds the installed debugger"""
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return find_program('lldb', ['/usr/bin'])
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def dump_info(self, pid, process_name, stream, take_dump = False):
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dbg = self.__find_debugger()
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if dbg is None:
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stream.write("WARNING: Debugger lldb not found, skipping dumping of %d\n" % (pid))
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return
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stream.write("INFO: Debugger %s, analyzing %d\n" % (dbg, pid))
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lldb_version = callo([dbg, "--version"])
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stream.write(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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stream.write("WARNING: Debugger lldb is too old, please upgrade to XCode 7.2\n")
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return
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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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"process save-core dump_" + process_name + "." + str(pid) + "." + self.get_dump_ext() if take_dump else "",
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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])))
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call(['cat', tf.name])
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call([dbg, '--source', tf.name])
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stream.write("INFO: Done analyzing process\n")
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def get_dump_ext(self):
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return "core"
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def dump_core(self, pid, output_file):
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"""Take a dump of pid to specified file"""
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sys.stderr.write("ERROR: lldb does not support dumps, stupid debugger\n")
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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):
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"""Get list of [Pid, Process Name]"""
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ps = self.__find_ps()
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sys.stdout.write("INFO: Getting list of processes using %s\n" % ps)
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ret = callo([ps, "-axco", "pid,comm"])
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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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sys.stdout.write("INFO: Done analyzing process\n")
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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):
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"""Finds the installed debugger"""
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return find_program('gdb', ['/opt/mongodbtoolchain/gdb/bin', '/usr/bin'])
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def dump_info(self, pid, process_name, stream, take_dump = False):
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dbg = self.__find_debugger()
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if dbg is None:
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stream.write("WARNING: Debugger gdb not found, skipping dumping of %d\n" % (pid))
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return
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stream.write("INFO: Debugger %s, analyzing %d\n" % (dbg, pid))
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call([dbg, "--version"])
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cmds = [
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"set pagination off",
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"attach %d" % pid,
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"info sharedlibrary",
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"thread apply all bt",
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"gcore dump_" + process_name + "." + str(pid) + "." + self.get_dump_ext() if take_dump else "",
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"set confirm off",
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"quit",
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]
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call([dbg, "--quiet"] + list( itertools.chain.from_iterable([['-ex', b] for b in cmds])))
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stream.write("INFO: Done analyzing process\n")
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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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def dump_core(self, pid, output_file):
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"""Take a dump of pid to specified file"""
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dbg = self._find_gcore()
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if dbg is None:
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sys.stdout.write("WARNING: Debugger gcore not found, skipping dumping of %d to %s\n" % (pid, output_file))
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return
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sys.stdout.write("INFO: Debugger %s, analyzing %d to %s\n" % (dbg, pid, output_file))
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call([dbg, "-o", output_file, str(pid)])
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sys.stdout.write("INFO: Done analyzing process\n")
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# GCore appends the pid to the output file name
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return output_file + "." + str(pid)
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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):
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"""Get list of [Pid, Process Name]"""
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ps = self.__find_ps()
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sys.stdout.write("INFO: Getting list of processes using %s\n" % ps)
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call([ps, "--version"])
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ret = callo([ps, "-eo", "pid,args"])
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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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sys.stdout.write("INFO: Done analyzing process\n")
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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):
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"""Get list of [Pid, Process Name]"""
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ps = self.__find_ps()
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sys.stdout.write("INFO: Getting list of processes using %s\n" % ps)
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ret = callo([ps, "-eo", "pid,args"])
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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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sys.stdout.write("INFO: Done analyzing process\n")
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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):
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"""Finds the installed jstack debugger"""
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return find_program('jstack', ['/usr/bin'])
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def dump_info(self, pid, process_name, stream, take_dump = False):
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"""Dump java thread stack traces to the console"""
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jstack = self.__find_debugger()
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if jstack is None:
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stream.write("WARNING: Debugger jstack not found, skipping dumping of %d\n" % (pid))
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return
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stream.write("INFO: Debugger %s, analyzing %d\n" % (jstack, pid))
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call([jstack, "-l", str(pid)])
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stream.write("INFO: Done analyzing process\n")
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def dump_core(self, pid, output_file):
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"""Take a dump of pid to specified file"""
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sys.stderr.write("ERROR: jstack does not support dumps\n")
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# jstack is a JDK utility
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class JstackWindowsDumper(object):
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def dump_info(self, pid, process_name, stream):
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"""Dump java thread stack traces to the console"""
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stream.write("WARNING: Debugger jstack not supported, skipping dumping of %d\n" % (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(pid):
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"""Signal python process with SIGUSR1, N/A on Windows"""
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try:
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os.kill(pid, signal.SIGUSR1)
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print "Waiting for python process to report"
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time.sleep(5)
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except OSError,e:
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print "Hit OS error trying to signal python process: " + str(e)
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except AttributeError:
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print "Cannot send signal to python on Windows"
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def timeout_protector():
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print "Script timeout has been hit, terminating"
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if sys.platform == "win32":
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# Have the process exit with code 9 when it terminates itself to closely match the exit code
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# of the process when it sends itself a SIGKILL.
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handle = win32process.GetCurrentProcess()
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win32process.TerminateProcess(handle, 9)
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else:
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os.kill(os.getpid(), signal.SIGKILL)
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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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print "Python Version: " + sys.version
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print "OS: " + platform.platform()
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try:
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distro = platform.linux_distribution()
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print "Linux Distribution: " + str(distro)
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except AttributeError:
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print "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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print "Current User: " + str(uid)
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current_login = os.getlogin()
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print "Current Login: " + current_login
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except OSError:
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print "Cannot determine Unix Current Login"
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except AttributeError:
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print "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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parser = OptionParser(description=__doc__)
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parser.add_option('-p', '--process_names', dest='process_names', help='List of process names to analyze')
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parser.add_option('-s', '--max_core_dumps_size', dest='max_core_dumps_size', default=10000, help='Maximum total size of core dumps to keep in megabytes')
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(options, args) = parser.parse_args()
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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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[ps, dbg, jstack] = get_hang_analyzers()
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if( ps == None or (dbg == None and jstack == None)):
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sys.stderr.write("hang_analyzer.py: Unsupported platform: %s\n" % (sys.platform))
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exit(1)
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# Make sure the script does not hang
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timer = threading.Timer(120, timeout_protector)
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timer.start()
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processes_orig = ps.dump_processes()
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# Find all running interesting processes.
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processes = [a for a in processes_orig
|
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if any([a[1].find(ip) >= 0 for ip in interesting_processes]) and a[0] != os.getpid()]
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|
|
|
sys.stdout.write("Found %d interesting processes\n" % len(processes))
|
|
|
|
max_dump_size_bytes = int(options.max_core_dumps_size) * 1024 * 1024
|
|
|
|
if( len(processes) == 0):
|
|
for process in processes_orig:
|
|
sys.stdout.write("Ignoring process %d of %s\n" % (process[0], process[1]))
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else:
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|
# Dump all other processes, except python & java.
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|
for process in [a for a in processes if not re.match("^(java|python)", a[1])]:
|
|
sys.stdout.write("Dumping process %d of %s\n" % (process[0], process[1]))
|
|
dbg.dump_info(process[0], process[1], sys.stdout, check_dump_quota(max_dump_size_bytes, dbg.get_dump_ext()))
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|
|
|
# Dump java processes using jstack.
|
|
for process in [a for a in processes if a[1].startswith("java")]:
|
|
sys.stdout.write("Dumping process %d of %s\n" % (process[0], process[1]))
|
|
jstack.dump_info(process[0], process[1], sys.stdout)
|
|
|
|
# Dump python processes after signalling them.
|
|
for process in [a for a in processes if a[1].startswith("python")]:
|
|
signal_process(process[0])
|
|
|
|
dbg.dump_info(process[0], process[1], sys.stdout, check_dump_quota(max_dump_size_bytes, dbg.get_dump_ext()))
|
|
|
|
# Suspend the timer so we can exit cleanly
|
|
timer.cancel()
|
|
|
|
sys.stdout.write("Done analyzing processes for hangs\n")
|
|
|
|
if __name__ == "__main__":
|
|
main()
|