174823 2017-07-25 10:09:06 -0700 Uncaught Exception: undefined is not an object (evaluating 'this._memoryRow.value = Number.bytesToString(this._canvas.memoryCost)') 2017-07-27 16:14:40 -0700 1 1 1 Unclassified WebKit Web Inspector WebKit Nightly Build All All RESOLVED FIXED https://www.apple.com/ipad-pro/ P2 Normal --- 1 bburg hi bburg commit-queue inspector-bugzilla-changes joepeck webkit-bug-importer oldest_to_newest 1331982 0 bburg 2017-07-25 10:09:06 -0700 ------- Inspected URL: https://www.apple.com/ipad-pro/ Loading completed: true Frontend User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13) AppleWebKit/605.1.1+ (KHTML, like Gecko) Dispatch Source: Protocol Event Protocol Event: {"method":"Canvas.canvasMemoryChanged","params":{"canvasId":"canvas:0.6","memoryCost":182400}} Uncaught Exceptions: - undefined is not an object (evaluating 'this._memoryRow.value = Number.bytesToString(this._canvas.memoryCost)') (at CanvasDetailsSidebarPanel.js:287:24) _formatMemoryRow @ CanvasDetailsSidebarPanel.js:287:24 _canvasMemoryChanged @ CanvasDetailsSidebarPanel.js:292:30 dispatch @ Object.js:170:30 dispatchEventToListeners @ Object.js:177:17 memoryCost @ Canvas.js:119:38 canvasMemoryChanged @ CanvasManager.js:84:15 canvasMemoryChanged @ CanvasObserver.js:42:55 dispatchEvent @ InspectorBackend.js:293:42 _dispatchEvent @ Connection.js:193:32 dispatch @ Connection.js:71:32 dispatch @ InspectorBackend.js:152:49 dispatchNextQueuedMessageFromBackend @ MessageDispatcher.js:42:34 Additional Details: cause --> An uncaught exception was thrown while handling event: Canvas.canvasMemoryChanged ------- * STEPS TO REPRODUCE 1. Turn on canvas feature 2. Go to mentioned website and click around until a canvas shows up 1332378 1 hi 2017-07-26 10:29:51 -0700 Do you have any other steps to reproduce this? I tried what you said and haven't been able to cause the error. 1332388 2 joepeck 2017-07-26 10:58:32 -0700 I think it is possible that this code has been reached before `initialLayout` has created `this._memoryRow`. So we should probably just bail if !this._memoryRow, or expose View's `didInitialLayout` and check that? 1332474 3 316489 hi 2017-07-26 15:23:00 -0700 Created attachment 316489 Patch 1332492 4 316489 joepeck 2017-07-26 16:13:57 -0700 Comment on attachment 316489 Patch r=me Can you also remove the early return in _refreshIdentitySection? It seems unnecessary given its only called in one place after the canvas was already verified. 1332499 5 316497 hi 2017-07-26 16:35:22 -0700 Created attachment 316497 Patch 1332514 6 316497 commit-queue 2017-07-26 17:13:24 -0700 Comment on attachment 316497 Patch Clearing flags on attachment: 316497 Committed r219972: <http://trac.webkit.org/changeset/219972> 1332515 7 commit-queue 2017-07-26 17:13:25 -0700 All reviewed patches have been landed. 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