[Webkit-unassigned] [Bug 167755] New: GC may not visit event targets for async events
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Thu Feb 2 14:08:10 PST 2017
https://bugs.webkit.org/show_bug.cgi?id=167755
Bug ID: 167755
Summary: GC may not visit event targets for async events
Classification: Unclassified
Product: WebKit
Version: WebKit Nightly Build
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: HTML DOM
Assignee: webkit-unassigned at lists.webkit.org
Reporter: msaboff at apple.com
CC: cdumez at apple.com
]
When running the test fast/shadow-dom/slotchange-event-bubbling.html with a Debug build and the options JSC_scribbleFreeCells=true JSC_collectContinuously=true JSC_useGenerationalGC=false the following ASSERT will fire in JSEventListener.h
129 ASSERT(!m_isolatedWorld->isNormal() || m_wrapper || !m_jsFunction);
This is due to the Weak m_wrapper having been collected while the m_jsFunction is still alive. We need to make sure we visit wrappers and functions for event targets that are on an asynchromous event queue.
<rdar://problem/30316709>
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