[Webkit-unassigned] [Bug 201005] New: [JSC] Prune about-to-be-notified rejected promises list at GC flip
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Wed Aug 21 16:09:20 PDT 2019
https://bugs.webkit.org/show_bug.cgi?id=201005
Bug ID: 201005
Summary: [JSC] Prune about-to-be-notified rejected promises
list at GC flip
Product: WebKit
Version: WebKit Nightly Build
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: JavaScriptCore
Assignee: webkit-unassigned at lists.webkit.org
Reporter: ross.kirsling at sony.com
>From bug 197172 comment 36:
> If you have a loop with:
>
> let p = new Promise((resolve, reject) => {
> ...
> reject(p)
> });
>
> p will be kept alive until the the microtasks are drained. Which means programs will OOM if they never drain all their microtasks...
>
> I think, at least, you'll need to clear handled promises at the GC flip. See where we call finalizeUnconditionalFinalizers.
Given the WHATWG spec*, I don't believe this is something we can address for the normal, web-hosted case (i.e. the "unhandledrejection" event), but it would be a possible improvement for rejection tracking in a standalone JSContext (which has no spec).
[*] https://html.spec.whatwg.org/multipage/webappapis.html#unhandled-promise-rejections
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