[Webkit-unassigned] [Bug 240325] REGRESSION (r293933): [ iOS Debug ][ macOS Debug wk2 ] ASSERTION FAILED: m_requestCount > -1

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=240325

--- Comment #10 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Looks like an interaction with preloading:

20:41:48.278 491 worker/0   ImageLoader::updateFromElement: request http://localhost:8800/html/semantics/embedded-content/the-img-element/resources/image.png?image-loading-lazy-in-viewport-0.26373450708710056-1655178032911 - setting ignore to true for lazy loading
20:41:48.278 491 worker/0    RequestCountTracker: loader 0x4d40840c0 resource 0x4d4088e80 http://localhost:8800/html/semantics/embedded-content/the-img-element/resources/image.png?image-loading-lazy-in-viewport-0.26373450708710056-1655178032911
20:41:48.278 491 worker/0   CachedResourceLoader 0x4d40840c0 incrementRequestCount for resource http://localhost:8800/html/semantics/embedded-content/the-img-element/resources/image.png?image-loading-lazy-in-viewport-0.26373450708710056-1655178032911 ignore: 1
20:41:48.278 491 worker/0   CachedResourceLoader 0x4d4084640 requestResource http://localhost:8800/html/semantics/embedded-content/the-img-element/resources/image.png?image-loading-lazy-in-viewport-0.26373450708710056-1655178032911 - setting ignore to false for preload
20:41:48.278 491 worker/0   CachedResourceLoader 0x4d4084640 incrementRequestCount for resource http://localhost:8800/html/semantics/embedded-content/the-img-element/resources/image.png?image-loading-lazy-in-viewport-0.26373450708710056-1655178032911 ignore: 0
20:41:48.279 491 worker/0   ~RequestCountTracker: loader 0x4d40840c0 resource 0x4d4088e80 http://localhost:8800/html/semantics/embedded-content/the-img-element/resources/image.png?image-loading-lazy-in-viewport-0.26373450708710056-1655178032911
20:41:48.279 491 worker/0   CachedResourceLoader 0x4d40840c0 decrementRequestCount for resource http://localhost:8800/html/semantics/embedded-content/the-img-element/resources/image.png?image-loading-lazy-in-viewport-0.26373450708710056-1655178032911 ignore: 0
20:41:48.279 491 worker/0   CachedResourceLoader 0x4d40840c0 decrementRequestCount: bad request count for resource http://localhost:8800/html/semantics/embedded-content/the-img-element/resources/image.png?image-loading-lazy-in-viewport-0.26373450708710056-1655178032911

Looks like we have two separate CachedResourceLoader for the same CachedResource (weird). Preloading toggles m_ignoreForRequestCount on the CachedResource, which causes an extra decrement of m_requestCount on one of the CachedResourceLoaders.

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