chromium-dev,
There is a known compile-time issue relating to goma which was affecting the ios-simulator and ios-device builders on tryserver.chromium.mac. This would have impacted try jobs against the two builders as well as CQ (incl. dry run).
The issue manifested as:
*ERROR*: compiler_proxy:4458ms: reached max number of active fail fallbacks
We currently believe the issue to be resolved, but please continue to report any occurrences in
https://crbug.com/654806.
Thanks,
Chrome Infrastructure Team