[Webkit-unassigned] [Bug 202112] New: [CG] Occasional assertion failures in ShareableBitmap::~ShareableBitmap()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=202112

            Bug ID: 202112
           Summary: [CG] Occasional assertion failures in
                    ShareableBitmap::~ShareableBitmap()
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit2
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: david_quesada at apple.com

CGImageRef's created from a ShareableBitmap can legitimately be deallocated on a background thread. When this happens, the data provider's release callback will be called. This derefs the ShareableBitmap, which might cause it to deallocate, isn't allowed on the background thread. releaseDataProviderData() should dispatch to the main runloop if it is called from a background thread. This is similar to what r250151 added for releaseBitmapContextData().

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