[Webkit-unassigned] [Bug 215729] New: Memory leak issue for WKWebView:evaluateJavaScript

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215729

            Bug ID: 215729
           Summary: Memory leak issue for WKWebView:evaluateJavaScript
           Product: WebKit
           Version: Safari 13
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: Michael.kreitmann at accenture.com

Created attachment 407008

  --> https://bugs.webkit.org/attachment.cgi?id=407008&action=review

Xcode project to reproduce the issue

When calling evalueJavaScript function with a large String (i.e. a 100MB String) as show below, WebView will always hold a reference to this large string (allocating memory) and will not release the memory.

Executing this code several times, will cause WebKit task to crash (due to memory issues) and will restart.


__block NSString *script = [NSString stringWithFormat:@"//%@", [@"" stringByPaddingToLength:100*1024*1024 withString: @"?" startingAtIndex:0]];
[weakWebView evaluateJavaScript:script completionHandler:nil];

See attached Xcode project to reproduce the issue.

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