https://treeherder.mozilla.org/logviewer.html#?job_id=9486527&repo=mozilla-inbound 04:09:30 INFO - 5422 INFO TEST-START | browser/devtools/performance/test/browser_perf-clear-02.js 04:09:33 INFO - TypeError: recording is null: WaterfallView<._onMarkerSelected@chrome://browser/content/devtools/performance/views/details-waterfall.js:77:9 04:09:33 INFO - EventEmitter_emit@resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/devtools/event-emitter.js:137:11 04:09:33 INFO - Waterfall.prototype.selectRow@resource://gre/modules/commonjs/toolkit/loader.js -> resource:///modules/devtools/shared/timeline/waterfall.js:368:7 04:09:33 INFO - Waterfall.prototype._buildOutstandingMarkers@resource://gre/modules/commonjs/toolkit/loader.js -> resource:///modules/devtools/shared/timeline/waterfall.js:304:5 04:09:33 INFO - Waterfall.prototype._buildMarkers/func@resource://gre/modules/commonjs/toolkit/loader.js -> resource:///modules/devtools/shared/timeline/waterfall.js:284:24 04:09:33 INFO - setNamedTimeout/<@resource:///modules/devtools/ViewHelpers.jsm:66:39 04:09:33 INFO - setTimeout_timer@resource://gre/modules/Timer.jsm:30:5 04:09:34 INFO - ###!!! [Parent][OnMaybeDequeueOne] Error: Channel closing: too late to send/recv, messages will be lost 04:09:34 INFO - ###!!! [Parent][OnMaybeDequeueOne] Error: Channel closing: too late to send/recv, messages will be lost 04:09:34 INFO - ###!!! [Parent][OnMaybeDequeueOne] Error: Channel closing: too late to send/recv, messages will be lost 04:09:34 INFO - ###!!! [Parent][OnMaybeDequeueOne] Error: Channel closing: too late to send/recv, messages will be lost 04:09:34 INFO - ###!!! [Parent][OnMaybeDequeueOne] Error: Channel closing: too late to send/recv, messages will be lost 04:09:34 INFO - MEMORY STAT vsize after test: 824074240 04:09:34 INFO - MEMORY STAT residentFast after test: 224792576 04:09:34 INFO - MEMORY STAT heapAllocated after test: 170479884 04:09:34 INFO - 5423 INFO TEST-OK | browser/devtools/performance/test/browser_perf-clear-02.js | took 4161ms

Hopefully fixed by bug 1157523 (now on fx-team)