Andrea can you please take a look? Seems to be from bug 1590075 here are several failures that showed up here: https://treeherder.mozilla.org/#/jobs?repo=mozilla-central&resultStatus=pending%2Crunning%2Csuccess%2Ctestfailed%2Cbusted%2Cexception&classifiedState=unclassified&searchStr=windows%2C7%2Cshippable%2Copt%2Cmochitests%2Ctest-windows7-32-shippable%2Fopt-mochitest-browser-chrome-e10s-7%2Cm%28bc7%29&selectedJob=272562771
Bug 1558420 Comment 9 Edit History
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Andrea can you please take a look? Seems to be from bug 1590075 here are several failures that showed up here: https://treeherder.mozilla.org/#/jobs?repo=mozilla-central&resultStatus=pending%2Crunning%2Csuccess%2Ctestfailed%2Cbusted%2Cexception&classifiedState=unclassified&searchStr=windows%2C7%2Cshippable%2Copt%2Cmochitests%2Ctest-windows7-32-shippable%2Fopt-mochitest-browser-chrome-e10s-7%2Cm(bc7)&selectedJob=272562771