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GDB Mozilla symbol server
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| # Any copyright is dedicated to the Public Domain. | |
| # http://creativecommons.org/publicdomain/zero/1.0/ | |
| # | |
| # A GDB Python script to fetch debug symbols from the Mozilla symbol server. | |
| # | |
| # To use, run `source /path/to/symbols.py` in GDB 7.9 or newer, or | |
| # put that in your ~/.gdbinit. | |
| from __future__ import print_function | |
| import gzip | |
| import io | |
| import itertools | |
| import os | |
| import shutil | |
| import sys | |
| try: | |
| from urllib.request import urlopen | |
| from urllib.parse import urljoin, quote | |
| except ImportError: | |
| from urllib2 import urlopen | |
| from urllib import quote | |
| from urlparse import urljoin | |
| SYMBOL_SERVER_URL = 'https://s3-us-west-2.amazonaws.com/org.mozilla.crash-stats.symbols-public/v1/' | |
| debug_dir = os.path.join(os.environ['HOME'], '.cache', 'gdb') | |
| cache_dir = os.path.join(debug_dir, '.build-id') | |
| def munge_build_id(build_id): | |
| ''' | |
| Breakpad stuffs the build id into a GUID struct so the bytes are | |
| flipped from the standard presentation. | |
| ''' | |
| b = list(map(''.join, list(zip(*[iter(build_id.upper())]*2)))) | |
| return ''.join(itertools.chain(reversed(b[:4]), reversed(b[4:6]), | |
| reversed(b[6:8]), b[8:16])) + '0' | |
| def try_fetch_symbols(filename, build_id, destination): | |
| debug_file = os.path.join(destination, build_id[:2], build_id[2:] + '.debug') | |
| if os.path.exists(debug_file): | |
| return debug_file | |
| try: | |
| d = os.path.dirname(debug_file) | |
| if not os.path.isdir(d): | |
| os.makedirs(d) | |
| except OSError: | |
| pass | |
| path = os.path.join(filename, munge_build_id(build_id), filename + '.dbg.gz') | |
| url = urljoin(SYMBOL_SERVER_URL, quote(path)) | |
| try: | |
| u = urlopen(url) | |
| if u.getcode() != 200: | |
| return None | |
| print('Fetching symbols from {0}'.format(url)) | |
| with open(debug_file, 'wb') as f, gzip.GzipFile(fileobj=io.BytesIO(u.read()), mode='r') as z: | |
| shutil.copyfileobj(z, f) | |
| return debug_file | |
| except: | |
| return None | |
| def is_moz_binary(filename): | |
| ''' | |
| Try to determine if a file lives in a Firefox install dir, to save | |
| HTTP requests for things that aren't going to work. | |
| ''' | |
| # The linux-gate VDSO doesn't have a real filename. | |
| if not os.path.isfile(filename): | |
| return False | |
| while True: | |
| filename = os.path.dirname(filename) | |
| if filename == '/': | |
| return False | |
| if os.path.isfile(os.path.join(filename, 'application.ini')): | |
| return True | |
| def fetch_symbols_for(objfile): | |
| build_id = objfile.build_id if hasattr(objfile, 'build_id') else None | |
| if getattr(objfile, 'owner', None) is not None or any(o.owner == objfile for o in gdb.objfiles()): | |
| # This is either a separate debug file or this file already | |
| # has symbols in a separate debug file. | |
| return | |
| if build_id and is_moz_binary(objfile.filename): | |
| debug_file = try_fetch_symbols(os.path.basename(objfile.filename), build_id, cache_dir) | |
| if debug_file: | |
| objfile.add_separate_debug_file(debug_file) | |
| def new_objfile(event): | |
| fetch_symbols_for(event.new_objfile) | |
| def fetch_symbols(): | |
| ''' | |
| Try to fetch symbols for all loaded modules. | |
| ''' | |
| for objfile in gdb.objfiles(): | |
| fetch_symbols_for(objfile) | |
| # Create our debug cache dir. | |
| try: | |
| if not os.path.isdir(cache_dir): | |
| os.makedirs(cache_dir) | |
| except OSError: | |
| pass | |
| # Set it as a debug-file-directory. | |
| try: | |
| dirs = gdb.parameter('debug-file-directory').split(':') | |
| except gdb.error: | |
| dirs = [] | |
| if debug_dir not in dirs: | |
| dirs.append(debug_dir) | |
| gdb.execute('set debug-file-directory %s' % ':'.join(dirs)) | |
| gdb.events.new_objfile.connect(new_objfile) |
Thanks! That hang on startup had been driving me nuts but I never got around to investigating it!
symbols.mozilla.org is switching to GCP soon. One of the consequences of that is that it'll no longer be saving uploaded symbols to that S3 bucket.
I suggest switching to https://symbols.mozilla.org/ as the SYMBOL_SERVER_URL. I'm pretty sure that'll work fine.
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I got an infinite loop in
def is_moz_binary(filename):with anobjfile.filenamethat issystem-supplied DSO at 0x7fff4939b000. Stripping dirnames from that lead to an empty string.I changed it like this: