[Webkit-unassigned] [Bug 250345] New: AX: Isolated trees queued for destruction will not be cleaned up unless an AX client requests an attribute from a wrapper in the destroyed tree

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=250345

            Bug ID: 250345
           Summary: AX: Isolated trees queued for destruction will not be
                    cleaned up unless an AX client requests an attribute
                    from a wrapper in the destroyed tree
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tyler_w at apple.com
                CC: andresg_22 at apple.com,
                    webkit-bug-importer at group.apple.com

Currently, isolated trees are cleaned up like so:

  1. AXObjectCache::~AXObjectCache() calls AXIsolatedTree::removeTreeForPageID(*m_pageID)
  2. AXIsolatedTree::removeTreeForPageID calls AXIsolatedTree::queueForDestruction
  3. AXIsolatedTree::queueForDestruction sets m_queuedForDestruction to true
  4. The next time AXIsolatedTree::applyPendingChanges() is called, the tree is destroyed if m_queuedForDestruction is true

Because this relies on AXIsolatedTree::applyPendingChanges() being called organically (i.e. an AX client requesting an attribute from a wrapper that is part of the soon-to-be-destroyed tree), it's possible we could never clean up a tree queued for destruction. AXIsolatedTree::queueForDestruction should probably set some internal timer to clean the tree up so we don't rely on AX clients requesting data from a soon-to-be-destroyed wrapper.

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