build30-b1	Win Zenbook Perf (1)
build31-b1	Win Zenbook Perf (2)
build32-b1	Win Zenbook Perf (3)
build33-b1	Win Zenbook Perf (4)
build34-b1	Win Zenbook Perf (5)

https://build.chromium.org/p/chromium.perf/builders/Win%20Zenbook%20Perf%20(5)

@@@STEP_CURSOR@Uncaught Exception@@@
@@@STEP_STARTED@@@
@@@STEP_LOG_LINE@exception@Traceback (most recent call last):@@@
@@@STEP_LINK@logdog-->exception@https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.perf%2FWin_Zenbook_Perf__5_%2F3088%2F%2B%2Frecipes%2Fsteps%2FUncaught_Exception%2F0%2Flogs%2Fexception%2F0@@@
@@@STEP_LOG_LINE@exception@  File "C:\b\rr\tmpwvy06r\rw\checkout\infra\.recipe_deps\recipe_engine\recipe_engine\run.py", line 424, in run@@@
@@@STEP_LINK@stdout-->stdio@https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.perf%2FWin_Zenbook_Perf__5_%2F3088%2F%2B%2Frecipes%2Fsteps%2FUncaught_Exception%2F0%2Fstdout@@@
@@@STEP_LOG_LINE@exception@    recipe_result = recipe_script.run(api, api._engine.properties)@@@
@@@STEP_LOG_LINE@exception@  File "C:\b\rr\tmpwvy06r\rw\checkout\infra\.recipe_deps\recipe_engine\recipe_engine\loader.py", line 59, in run@@@
@@@STEP_LOG_LINE@exception@    self.RunSteps, properties, self.PROPERTIES, api=api)@@@
@@@STEP_LOG_LINE@exception@  File "C:\b\rr\tmpwvy06r\rw\checkout\infra\.recipe_deps\recipe_engine\recipe_engine\loader.py", line 514, in invoke_with_properties@@@
@@@STEP_LOG_LINE@exception@    **additional_args)@@@
@@@STEP_LOG_LINE@exception@  File "C:\b\rr\tmpwvy06r\rw\checkout\infra\.recipe_deps\recipe_engine\recipe_engine\loader.py", line 475, in _invoke_with_properties@@@
@@@STEP_LOG_LINE@exception@    return callable_obj(*props, **additional_args)@@@
@@@STEP_LOG_LINE@exception@  File "C:\b\rr\tmpwvy06r\rw\checkout\infra\recipes\chromium.py", line 35, in RunSteps@@@
@@@STEP_LOG_LINE@exception@    api.chromium_tests.main_waterfall_steps(api)@@@
@@@STEP_LOG_LINE@exception@  File "C:\b\rr\tmpwvy06r\rw\checkout\infra\.recipe_deps\build\scripts/slave\recipe_modules\chromium_tests\api.py", line 835, in main_waterfall_steps@@@
@@@STEP_LOG_LINE@exception@    bot_config)@@@
@@@STEP_LOG_LINE@exception@  File "C:\b\rr\tmpwvy06r\rw\checkout\infra\.recipe_deps\recipe_engine\recipe_engine\recipe_api.py", line 382, in _inner@@@
@@@STEP_LOG_LINE@exception@    return func(*a, **kw)@@@
@@@STEP_LOG_LINE@exception@  File "C:\b\rr\tmpwvy06r\rw\checkout\infra\.recipe_deps\build\scripts/slave\recipe_modules\chromium_tests\api.py", line 208, in prepare_checkout@@@
@@@STEP_LOG_LINE@exception@    bot_config, root_solution_revision)@@@
@@@STEP_LOG_LINE@exception@  File "C:\b\rr\tmpwvy06r\rw\checkout\infra\.recipe_deps\recipe_engine\recipe_engine\recipe_api.py", line 382, in _inner@@@
@@@STEP_LOG_LINE@exception@    return func(*a, **kw)@@@
@@@STEP_LOG_LINE@exception@  File "C:\b\rr\tmpwvy06r\rw\checkout\infra\.recipe_deps\build\scripts/slave\recipe_modules\chromium_checkout\api.py", line 76, in ensure_checkout@@@
@@@STEP_LOG_LINE@exception@    **kwargs)@@@
@@@STEP_LOG_LINE@exception@  File "C:\b\rr\tmpwvy06r\rw\checkout\infra\.recipe_deps\recipe_engine\recipe_engine\recipe_api.py", line 382, in _inner@@@
@@@STEP_LOG_LINE@exception@    return func(*a, **kw)@@@
@@@STEP_LOG_LINE@exception@  File "C:\b\rr\tmpwvy06r\rw\checkout\infra\.recipe_deps\depot_tools\recipe_modules\bot_update\api.py", line 296, in ensure_checkout@@@
@@@STEP_LOG_LINE@exception@    co_root = step_result.json.output['root']@@@
@@@STEP_LOG_LINE@exception@KeyError: 'root'@@@
@@@STEP_LOG_END@exception@@@

Is this related to issue 649703? if so most of the other bots on the master have recovered except Win Zen bots.