Devicelab "smoke_catalina_hot_mode_dev_cycle_ios__benchmark" failure "Error while starting Kernel isolate task"

[christopherfujino]

https://flutter-dashboard.appspot.com/api/get-log?ownerKey=ahFmbHV0dGVyLWRhc2hib2FyZHJfCxIJQ2hlY2tsaXN0Ij9mbHV0dGVyL2ZsdXR0ZXIvbWFzdGVyL2IxOGYxYjgxZmUwOWExZjJiZWEzOWVhYWM5Y2M3MDllMWFjNjAwY2YMCxIEVGFzaxiAgJitlZL0Cww

2020-11-24T13:18:51.833071: stdout: Performing hot restart...                                       
2020-11-24T13:18:51.833173: stdout: Restarted application in 1,622ms.
2020-11-24T13:19:01.844560: stdout: Benchmarking hot reload
2020-11-24T13:19:02.336088: stdout: Performing hot reload...                                        
2020-11-24T13:19:02.341727: stdout: Reloaded 0 libraries in 491ms.
2020-11-24T13:19:02.344558: stdout: 
2020-11-24T13:19:06.671623: stderr: Hot reload was rejected:
2020-11-24T13:19:06.671728: stderr: Error while starting Kernel isolate task.
stderr: Try performing a hot restart instead.
2020-11-24T13:19:06.672008: stdout: Performing hot reload...                                        
2020-11-24T13:19:06.672084: stdout: Try again after fixing the above error(s).
2020-11-24T14:16:27.981250: Task execution finished

[christopherfujino]

This could have been broken by any of the following 3 engine rolls:

• e5c4384
• 8241757
• 13ce828

The test hasn't been back filled for any of these engine rolls yet:

[iskakaushik]

I'm pausing the engine->framework roller until this is resolved.

[christopherfujino]

This appears to be a pre-existing flake, I can find the same failure as early as 8e73bab (and likely earlier)

https://flutter-dashboard.appspot.com/api/get-log?ownerKey=ahFmbHV0dGVyLWRhc2hib2FyZHJfCxIJQ2hlY2tsaXN0Ij9mbHV0dGVyL2ZsdXR0ZXIvbWFzdGVyLzhlNzNiYWI5NGM2MDUxMzE3YzlmYTQyNzlhMzczM2I2ZWUyYTNlZjIMCxIEVGFzaxiAgJi5tqKfCgw

[christopherfujino]

Since this test repeatedly fails on b18f1b8, while it passed on the previous, I landed a revert to see if it will fix the tree #71180

[keyonghan]

Unfortunately it hangs with the same error on the revert.

[christopherfujino]

Ok, I will re-land goderbauer's commit.

[christopherfujino]

This test was marked flaky in #71188