[Webkit-unassigned] [Bug 185608] New: iOS 11.3 WebKit crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=185608

            Bug ID: 185608
           Summary: iOS 11.3 WebKit crash
           Product: WebKit
           Version: Safari 11
          Hardware: iPhone / iPad
                OS: iOS 11
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: Canvas
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tomas.slavkovsky at windy.com
                CC: dino at apple.com

After upgrade of WebKit in iOS 11.3 & 11.3.1 Safari and webView in our Apache Cordova app started to crash. The crash occurs in iPhone on this URL [1] and also on the page inside the Cordova App [3].

Part of the JS that renders this component uses safe and old prooven ES5 only Javascript and uses canvas to render two big retina graphs.

When we connect iPhone Safari to remote debugger the bug does not occur. Standalone iPhone crashes on most of the occasions.

We are not 100% sure that bug is related to Canvas element or JS around it, but we suspect Canvas.

On a thread in our community forum [2] you can find a screen video of the bug. 

How to reproduce the bug:
1. On your iPhone in Safari open www.windy.com or app Windy [3]
2. Go to the menu (yellow three dots) and on the top of the menu click on “Find my location”
3. On picker in the map click to open the detail forecast
4. In detail forecast click airgram
5. In standard behavior, it will open airgram. However, now it stays in the loop and it is trying to open the page again and again. 



[1] https://www.windy.com/
[2] https://community.windy.com/topic/5780/ios-airgram-malfuction-on-iphone-ipad
[3] https://itunes.apple.com/cz/app/windy-wind-and-waves-forecast/id1161387262

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