new_gallery__crane_perf is flaky #64328
Description
It looks like some operations are taking many seconds to complete. Are the internal waitFor timeouts too short? Or is something else going wrong? Assigning @liyuqian who wrote the benchmark to investigate. Marking P1 since this is currently one of the things closing the tree.
2020-08-20T18:05:57.760892: stdout: [+1949 ms] 00:00 �[32m+0�[0m: Flutter Gallery transitions (setUpAll)�[0m
2020-08-20T18:05:57.784716: stderr: [ +23 ms] VMServiceFlutterDriver: Connecting to Flutter application at http://127.0.0.1:43709/Ih-WCnCG4gM=/
2020-08-20T18:05:57.893422: stderr: [ +108 ms] VMServiceFlutterDriver: Isolate found with number: 2964960610851895
2020-08-20T18:05:57.943666: stderr: [ +50 ms] VMServiceFlutterDriver: Isolate is paused at start.
2020-08-20T18:05:57.943933: stderr: [ ] VMServiceFlutterDriver: Attempting to resume isolate
2020-08-20T18:05:58.285920: stderr: [ +341 ms] VMServiceFlutterDriver: Connected to Flutter application.
2020-08-20T18:05:58.483514: stdout: [ +197 ms] Unexpected <collected> sentinel.
2020-08-20T18:05:58.530854: stdout: [ +47 ms] Unexpected <collected> sentinel.
2020-08-20T18:06:03.584743: stderr: [+5053 ms] VMServiceFlutterDriver: waitFor message is taking a long time to complete...
2020-08-20T18:06:03.664011: stdout: [ +79 ms] 00:05 �[32m+0�[0m: Flutter Gallery transitions only Crane�[0m
2020-08-20T18:06:03.774759: stdout: [ +110 ms] > crane@study
2020-08-20T18:06:03.776147: stdout: [ +1 ms] scrolling to demo
2020-08-20T18:06:09.321661: stderr: [+5545 ms] VMServiceFlutterDriver: scroll message is taking a long time to complete...
2020-08-20T18:06:13.798621: stderr: [+4476 ms] VMServiceFlutterDriver: waitFor message is taking a long time to complete...
2020-08-20T18:06:13.839430: stdout: [ +41 ms] 00:16 �[32m+0�[0m�[31m -1�[0m: Flutter Gallery transitions only Crane �[1m�[31m[E]�[0m�[0m
2020-08-20T18:06:13.840379: stdout: [ ] DriverError: Error in Flutter application: Timeout while executing waitFor: TimeoutException after 0:00:10.000000: Future not completed
2020-08-20T18:06:13.858280: stdout: [ +17 ms] package:flutter_driver/src/driver/vmservice_driver.dart 343:7 VMServiceFlutterDriver.sendCommand
2020-08-20T18:06:13.858589: stdout: [ ] ===== asynchronous gap ===========================
stdout: [ ] dart:async/zone.dart 1129:19 _CustomZone.registerBinaryCallback
2020-08-20T18:06:13.858834: stdout: [ ] dart:async-patch/async_patch.dart 94:8 _asyncErrorWrapperHelper
stdout: [ ] package:flutter_driver/src/driver/driver.dart 419:5 FlutterDriver.scrollUntilVisible
2020-08-20T18:06:13.859084: stdout: [ ] test_driver/transitions_perf_test.dart 161:18 runDemos
2020-08-20T18:06:13.859303: stdout: [ ] test_driver/transitions_perf_test.dart 242:17 main.<fn>.<fn>.<fn>