I also do not have idea what cause this :( default m-c caused a lot of failures on both Linux x64 QuantumRender debug and Linux x64 QuantumRender opt. https://treeherder.mozilla.org/#/jobs?repo=try&revision=c9c42930de4e5663f0e2395bde9e331dd7c9a92c In Linux x64 QuantumRender opt failures, there were "INFO - IOError on command, setting status to CRASH" message just before TEST-UNEXPECTED-CRASH.
Bug 1462885 Comment 15 Edit History
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I also do not have idea what cause this :( default m-c caused a lot of intermittent failures on both Linux x64 QuantumRender debug and Linux x64 QuantumRender opt. https://treeherder.mozilla.org/#/jobs?repo=try&revision=c9c42930de4e5663f0e2395bde9e331dd7c9a92c In Linux x64 QuantumRender opt failures, there were "INFO - IOError on command, setting status to CRASH" message just before TEST-UNEXPECTED-CRASH.