87803 2012-05-29 18:20:12 -0700 Layout tests often fail trying to stat nonexistent logs 2012-06-14 21:42:57 -0700 1 1 1 Unclassified WebKit Tools / Tests 528+ (Nightly build) Mac Unspecified RESOLVED FIXED P2 Normal --- 1 slewis webkit-unassigned abarth dpranke ojan slewis thorton webkit.review.bot oldest_to_newest 636675 0 slewis 2012-05-29 18:20:12 -0700 On Mac crashreporter will roll over logs after a certain number of crashes. This can cause the layout tests to fail if looking for a log that doesn't exist anymore. We're tracking bugs internally to fix that problem, but the the try/catch block should include the stat and catch OSError. backtrace: 18:01:45.278 79451 worker/5 raised OSError('[Errno 2] No such file or directory: '/Users/buildbot/Library/Logs/DiagnosticReports/WebProcess_2012-05-29-161118_buildbots-Mac-Pro-40.crash''): 18:01:45.278 79492 worker/7 mathml/presentation/fenced-mi.xhtml passed 18:01:45.278 79451 layout_tests/controllers/manager_worker_broker.py:290 (in run) 18:01:45.278 79451 self._worker_connection.run_message_loop() 18:01:45.278 79451 layout_tests/controllers/manager_worker_broker.py:243 (in run_message_loop) 18:01:45.278 79451 self._broker.run_message_loop(self._run_topic, self._client, delay_secs) 18:01:45.278 79451 layout_tests/controllers/manager_worker_broker.py:175 (in run_message_loop) 18:01:45.279 79451 self._run_loop(topic_name, client, block=True, delay_secs=delay_secs) 18:01:45.279 79451 layout_tests/controllers/manager_worker_broker.py:189 (in _run_loop) 18:01:45.279 79451 self._dispatch_message(msg, client) 18:01:45.279 79451 layout_tests/controllers/manager_worker_broker.py:198 (in _dispatch_message) 18:01:45.279 79451 message_handler(message.src, *optargs) 18:01:45.279 79451 layout_tests/controllers/worker.py:144 (in handle_test_list) 18:01:45.279 79451 self._run_test(test_input) 18:01:45.279 79451 layout_tests/controllers/worker.py:171 (in _run_test) 18:01:45.279 79451 result = self.run_test_with_timeout(test_input, test_timeout_sec) 18:01:45.279 79451 layout_tests/controllers/worker.py:213 (in run_test_with_timeout) 18:01:45.279 79451 return self._run_test_in_this_thread(test_input) 18:01:45.279 79451 layout_tests/controllers/worker.py:298 (in _run_test_in_this_thread) 18:01:45.279 79451 return self.run_single_test(self._driver, test_input) 18:01:45.279 79451 layout_tests/controllers/worker.py:302 (in run_single_test) 18:01:45.279 79451 test_input, driver, self._name) 18:01:45.279 79451 layout_tests/controllers/single_test_runner.py:46 (in run_single_test) 18:01:45.279 79451 return runner.run() 18:01:45.279 79451 layout_tests/controllers/single_test_runner.py:101 (in run) 18:01:45.280 79451 return self._run_reftest() 18:01:45.280 79451 layout_tests/controllers/single_test_runner.py:291 (in _run_reftest) 18:01:45.280 79451 reference_output = self._driver.run_test(DriverInput(reference_test_name, self._timeout, test_output.image_hash, should_run_pixel_test=True)) 18:01:45.280 79451 layout_tests/port/driver.py:217 (in run_test) 18:01:45.280 79451 return self._running_drivers[cmd_line_key].run_test(driver_input) 18:01:45.280 79451 layout_tests/port/webkit.py:579 (in run_test) 18:01:45.280 79451 newer_than=start_time) 18:01:45.280 79451 layout_tests/port/mac.py:194 (in _get_crash_log) 18:01:45.280 79451 crash_log = crash_logs.find_newest_log(name, pid, include_errors=True, newer_than=newer_than) 18:01:45.280 79451 common/system/crashlogs.py:38 (in find_newest_log) 18:01:45.280 79451 return self._find_newest_log_darwin(process_name, pid, include_errors, newer_than) 18:01:45.280 79451 common/system/crashlogs.py:59 (in _find_newest_log_darwin) 18:01:45.280 79451 if not newer_than or self._host.filesystem.mtime(path) > newer_than: 18:01:45.280 79451 common/system/filesystem.py:183 (in mtime) 18:01:45.280 79451 return os.stat(path).st_mtime 636680 1 dpranke 2012-05-29 18:24:13 -0700 the list of logs is only obtained 4 lines above ... doesn't that imply that we're rolling over the logs in the time it takes to actually walk the list (presumably less than a second or so)? How many things do you have crashing at once, and what is the limit on how many logs crash reporter will keep? 636681 2 slewis 2012-05-29 18:25:12 -0700 hmm, It isn't the crash log rollover causing the problem either. I just looked at the bot now, and there are older logs than the one it is looking for. I wonder how it got the name of a file that doesn't exist. 636688 3 dpranke 2012-05-29 18:32:03 -0700 (In reply to comment #2) > hmm, It isn't the crash log rollover causing the problem either. I just looked at the bot now, and there are older logs than the one it is looking for. I wonder how it got the name of a file that doesn't exist. Interesting. That's a good question. There would either have to be a bug in our file-finding code (which I just checked and it looks correct - that's certainly a plausible looking filename, at least, but maybe I'm missing something), or the file would've had to have been created and then deleted, or you're seeing some sort of a filesystem / python inconsistency between os.walk() and os.stat(). 636695 4 slewis 2012-05-29 18:35:23 -0700 It looks like ReportCrash doesn't necessarily remove by oldest logs first. I just had the logs disappear out from underneath me. It must use some sort of heuristic and we are getting bitten by it. 636697 5 dpranke 2012-05-29 18:36:50 -0700 I see. Well, catching the exception would certainly be defensively safe and correct; did you have a patch in the works, or do you want me to fix it? 636763 6 144683 slewis 2012-05-29 19:50:42 -0700 Created attachment 144683 patch 636771 7 144683 ojan 2012-05-29 20:10:58 -0700 Comment on attachment 144683 patch This needs a unittest. 637947 8 144973 slewis 2012-05-30 19:48:45 -0700 Created attachment 144973 patch and test 637958 9 slewis 2012-05-30 20:07:11 -0700 committed http://trac.webkit.org/projects/webkit/changeset/119030 649842 10 dpranke 2012-06-14 21:42:57 -0700 I'm not sure why this is still open ... closing. 144683 2012-05-29 19:50:42 -0700 2012-05-30 19:48:45 -0700 patch 0001-https-bugs.webkit.org-show_bug.cgi-id-87803.patch text/plain 3050 slewis RnJvbSA0ODg1YjI3MThjNDlhMzVjOGJhYjdkNTBhY2M4YWNkNDA4YjY4NTc1IE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBTdGVwaGFuaWUgTGV3aXMgPHNsZXdpc0BhcHBsZS5jb20+CkRh dGU6IFR1ZSwgMjkgTWF5IDIwMTIgMTk6NDA6MjYgLTA3MDAKU3ViamVjdDogW1BBVENIXSBodHRw 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