Whenever something goes wrong in webkit-patch (which sadly seems to happen more and more frequently) instead of giving an error message it spews out hundreds of lines worth of stack trance information that is not the least bit helpful. Did I do something wrong? Was an unexpected error encountered? Is the disk full? I have no idea. For example, I just tried webkit-patch rebaseline-expectations and after ~15 minutes of no output it printed about 800 lines of output like this: File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/tool/commands/rebaseline.py", line 189, in _rebaseline_test_and_update_expectations results_url = self._results_url(options.builder) File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/tool/commands/rebaseline.py", line 91, in _results_url return self._tool.buildbot_for_builder_name(builder_name).builder_with_name(builder_name).latest_layout_test_results_url() File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py", line 70, in latest_layout_test_results_url return self.accumulated_results_url() or self.latest_cached_build().results_url(); File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py", line 123, in latest_cached_build revision_build_pairs = self.revision_build_pairs_with_results() File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py", line 182, in revision_build_pairs_with_results return self._revision_to_build_map().items() File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py", line 178, in _revision_to_build_map self._revision_to_build_number = self._fetch_revision_to_build_map() File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py", line 159, in _fetch_revision_to_build_map result_files = self._buildbot._fetch_twisted_directory_listing(self.results_url()) File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py", line 401, in _fetch_twisted_directory_listing return self._parse_twisted_directory_listing(urllib2.urlopen(url)) File "/usr/lib/python2.6/urllib2.py", line 126, in urlopen return _opener.open(url, data, timeout) File "/usr/lib/python2.6/urllib2.py", line 397, in open response = meth(req, response) File "/usr/lib/python2.6/urllib2.py", line 510, in http_response 'http', request, response, code, msg, hdrs) File "/usr/lib/python2.6/urllib2.py", line 435, in error return self._call_chain(*args) File "/usr/lib/python2.6/urllib2.py", line 369, in _call_chain result = func(*args) File "/usr/lib/python2.6/urllib2.py", line 518, in http_error_default raise HTTPError(req.get_full_url(), code, msg, hdrs, fp) urllib2.HTTPError: HTTP Error 503: Service Temporarily Unavailable Traceback (most recent call last): File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkit-patch", line 84, in <module> main() File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkit-patch", line 79, in main WebKitPatch(os.path.abspath(__file__)).main() File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/tool/multicommandtool.py", line 313, in main result = command.check_arguments_and_execute(options, args, self) File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/tool/multicommandtool.py", line 122, in check_arguments_and_execute return self.execute(options, args, tool) or 0 File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/tool/commands/rebaseline.py", line 196, in execute self._rebaseline_test_and_update_expectations(options) File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/tool/commands/rebaseline.py", line 189, in _rebaseline_test_and_update_expectations results_url = self._results_url(options.builder) File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/tool/commands/rebaseline.py", line 91, in _results_url return self._tool.buildbot_for_builder_name(builder_name).builder_with_name(builder_name).latest_layout_test_results_url() File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py", line 70, in latest_layout_test_results_url return self.accumulated_results_url() or self.latest_cached_build().results_url(); File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py", line 123, in latest_cached_build revision_build_pairs = self.revision_build_pairs_with_results() File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py", line 182, in revision_build_pairs_with_results return self._revision_to_build_map().items() File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py", line 178, in _revision_to_build_map self._revision_to_build_number = self._fetch_revision_to_build_map() File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py", line 159, in _fetch_revision_to_build_map result_files = self._buildbot._fetch_twisted_directory_listing(self.results_url()) File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py", line 401, in _fetch_twisted_directory_listing return self._parse_twisted_directory_listing(urllib2.urlopen(url)) File "/usr/lib/python2.6/urllib2.py", line 126, in urlopen return _opener.open(url, data, timeout) File "/usr/lib/python2.6/urllib2.py", line 397, in open response = meth(req, response) File "/usr/lib/python2.6/urllib2.py", line 510, in http_response 'http', request, response, code, msg, hdrs) File "/usr/lib/python2.6/urllib2.py", line 435, in error return self._call_chain(*args) File "/usr/lib/python2.6/urllib2.py", line 369, in _call_chain result = func(*args) File "/usr/lib/python2.6/urllib2.py", line 518, in http_error_default raise HTTPError(req.get_full_url(), code, msg, hdrs, fp) urllib2.HTTPError: HTTP Error 503: Service Temporarily Unavailable Traceback (most recent call last): File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkit-patch", line 84, in <module> main() File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkit-patch", line 79, in main WebKitPatch(os.path.abspath(__file__)).main() File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/tool/multicommandtool.py", line 313, in main result = command.check_arguments_and_execute(options, args, self) File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/tool/multicommandtool.py", line 122, in check_arguments_and_execute return self.execute(options, args, tool) or 0 File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/tool/commands/rebaseline.py", line 196, in execute self._rebaseline_test_and_update_expectations(options) File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/tool/commands/rebaseline.py", line 189, in _rebaseline_test_and_update_expectations results_url = self._results_url(options.builder) File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/tool/commands/rebaseline.py", line 91, in _results_url return self._tool.buildbot_for_builder_name(builder_name).builder_with_name(builder_name).latest_layout_test_results_url() File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py", line 70, in latest_layout_test_results_url return self.accumulated_results_url() or self.latest_cached_build().results_url(); File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py", line 123, in latest_cached_build revision_build_pairs = self.revision_build_pairs_with_results() File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py", line 182, in revision_build_pairs_with_results return self._revision_to_build_map().items() File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py", line 178, in _revision_to_build_map self._revision_to_build_number = self._fetch_revision_to_build_map() File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py", line 159, in _fetch_revision_to_build_map result_files = self._buildbot._fetch_twisted_directory_listing(self.results_url()) File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py", line 401, in _fetch_twisted_directory_listing return self._parse_twisted_directory_listing(urllib2.urlopen(url)) File "/usr/lib/python2.6/urllib2.py", line 126, in urlopen return _opener.open(url, data, timeout) File "/usr/lib/python2.6/urllib2.py", line 397, in open response = meth(req, response) File "/usr/lib/python2.6/urllib2.py", line 510, in http_response 'http', request, response, code, msg, hdrs) File "/usr/lib/python2.6/urllib2.py", line 435, in error return self._call_chain(*args) File "/usr/lib/python2.6/urllib2.py", line 369, in _call_chain result = func(*args) File "/usr/lib/python2.6/urllib2.py", line 518, in http_error_default raise HTTPError(req.get_full_url(), code, msg, hdrs, fp) urllib2.HTTPError: HTTP Error 503: Service Temporarily Unavailable Traceback (most recent call last): File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkit-patch", line 84, in <module> main() File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkit-patch", line 79, in main WebKitPatch(os.path.abspath(__file__)).main() File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/tool/multicommandtool.py", line 313, in main result = command.check_arguments_and_execute(options, args, self) File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/tool/multicommandtool.py", line 122, in check_arguments_and_execute return self.execute(options, args, tool) or 0 File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/tool/commands/rebaseline.py", line 196, in execute self._rebaseline_test_and_update_expectations(options) File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/tool/commands/rebaseline.py", line 189, in _rebaseline_test_and_update_expectations results_url = self._results_url(options.builder) File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/tool/commands/rebaseline.py", line 91, in _results_url return self._tool.buildbot_for_builder_name(builder_name).builder_with_name(builder_name).latest_layout_test_results_url() File "/usr/local/google2/projects/webkit2/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py", line 70, in latest_layout_test_results_url Yet kept going. I have no idea what that means. Did the operation fail? Did it automatically retry the operations? Was something corrupted?