[Webkit-unassigned] [Bug 219845] New: App leaks memory in WebKit and crashes the tab

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=219845

            Bug ID: 219845
           Summary: App leaks memory in WebKit and crashes the tab
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
               URL: https://codepen.io/dawken/pen/GRjjNGR
                OS: iOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dario.damico at gmail.com

Created attachment 416134

  --> https://bugs.webkit.org/attachment.cgi?id=416134&action=review

The Jetsam report produced by an iPad where Safari crashed.

This is about an app that probably is leaking memory and as a result crashes Safari iOS, but does not crash any other browser. Unfortunately, we don't have a good repro; while I have a feeling that there is something wrong with the app itself, it does not appear to crash any other browser so I am reporting this. In our organization I am working full-time on understanding this crash, so feel free to contact me at any time. I trying very hard to isolate the problem and produce a more minimal repro, but so far I had not luck. I am mainly working using WebKit Web Inspector and Chrome DevTools in an attempt to determine what kind of leak we are facing.

The bug has been primarily observed on the following configuration:

Model name  : iPad Pro (9.7-inch)
OS version  : iPadOS 14.2
Model number: MLMN2LL/A

Another iPad model that is affected is MLPW2LL/A.

Also Epiphany on Linux seems to be affected.

To repro, run https://codepen.io/dawken/pen/GRjjNGR on iOS Safari. It should crash within a couple hours. The same app does not crash in any other browser, except maybe Epiphany on Linux.

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