Seems to be mainly load:media:youtube failing due to:

Traceback (most recent call last):
  File "/b/s/w/ir/third_party/catapult/telemetry/telemetry/value/failure.py", line 41, in _GetExcInfoFromMessage
    raise Exception(message)
Exception: Error: The sliding window must fit in the specified time range
    at Object.maxExpectedQueueingTimeInSlidingWindow (/tracing/extras/chrome/estimated_input_latency.html:308:13)
    at addExpectedQueueingTimeMetric_ (/tracing/metrics/system_health/expected_queueing_time_metric.html:139:23)
    at new expectedQueueingTimeMetric (/tracing/metrics/system_health/expected_queueing_time_metric.html:85:5)
    at runMetrics (/b/s/w/ir/third_party/catapult/tracing/tracing/metrics/metric_map_function.html:47:16)
    at metricMapFunction (/b/s/w/ir/third_party/catapult/tracing/tracing/metrics/metric_map_function.html:149:24)
    at Object.mapSingleTrace (/tracing/mre/map_single_trace.html:39:7)
    at eval (/b/s/w/ir/third_party/catapult/tracing/tracing/mre/map_single_trace_cmdline.html:61:18)
    at Object.runAndConvertErrorsToFailures (/tracing/mre/map_single_trace.html:24:10)
    at mapSingleTraceWithResult (/b/s/w/ir/third_party/catapult/tracing/tracing/mre/map_single_trace_cmdline.html:52:12)
    at Object.mapSingleTraceMain (/b/s/w/ir/third_party/catapult/tracing/tracing/mre/map_single_trace_cmdline.html:77:20)

Example:
https://uberchromegw.corp.google.com/i/chromium.perf/builders/Mac%20Pro%2010.11%20Perf/builds/1866
https://logs.chromium.org/v/?s=chrome%2Fbb%2Fchromium.perf%2FMac_Pro_10.11_Perf%2F1866%2F%2B%2Frecipes%2Fsteps%2Fsystem_health.common_desktop_on_ATI_GPU_on_Mac_on_Mac-10.11%2F0%2Fstdout

Going to disable.

Disabling that story on Mac, specifically; looks like Win is a different issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/acf6a9183353281a4c8b473d50d714dbdef41a6e

commit acf6a9183353281a4c8b473d50d714dbdef41a6e
Author: Oystein Eftevaag <oysteine@chromium.org>
Date: Sun Dec 17 13:35:19 2017

Disable system_health.desktop_common load:media:youtube on mac

TBR=nednguyen@chromium.org
BUG= 795585 

Change-Id: Idbe16201235a53ad7669478d58611708e607d5bc
Reviewed-on: https://chromium-review.googlesource.com/831508
Reviewed-by: oysteine <oysteine@chromium.org>
Commit-Queue: oysteine <oysteine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524622}
[modify] https://crrev.com/acf6a9183353281a4c8b473d50d714dbdef41a6e/tools/perf/page_sets/system_health/expectations.py

Dave: how do I kick off the bisect on this?

Since this is a metric crash, reassign this to Ulan who implemented this metric.

Is the EQT exception still an issue after https://chromium-review.googlesource.com/c/catapult/+/852827?

I looked at the most recent build on the waterfall. It seemed to me that we're not getting the expected queueing time metric error anymore, but there are other exceptions that's causing the current failure. An example warning message is "WARNING:root:task_output_dir '/var/folders/9x/6c6sv3cj4j53wzpzthbp4ksm0000gm/T/tmpdXVAsb' already exists!" followed by 

| End of shard 0                                                         
|  Pending: 36037.3s  EXPIRED (lack of capacity)                   

Is there any update for this bug?

I think the build is fine now but +Ned for confirmation before closing this. 

Sorry, I missed this bug. The fix in comment #11 looks good.

Looks like this is fixed to me. Mark dproy@ as owner since it was https://chromium-review.googlesource.com/c/catapult/+/852827 which fixed it