Bug 54740 – chrome.dll!WebCore::RenderBlock::addFocusRingRects OOM (404d82428bd920c896c411920eae1898)

• Status: NEW
• Component: HTML Editing

[Berend-Jan Wever]

Created attachment 82942 [details]
Repro

Chromium: http://code.google.com/p/chromium/issues/detail?id=73400
This looks very much like a dup of issue 54734, in that it is also an OOM that appears to be caused by a loop in the node tree.

http://codesearch.google.com/codesearch/p?hl=en#OAMlx_jo-ck/src/third_party/WebKit/Source/WebCore/rendering/RenderInline.cpp&q=addFocusRingRects&exact_package=chromium&sa=N&cd=1&ct=rc
void RenderInline::addFocusRingRects(Vector<IntRect>& rects, int tx, int ty)
{
    for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) {
        RootInlineBox* root = curr->root();
        int top = max(root->lineTop(), curr->y());
        int bottom = min(root->lineBottom(), curr->y() + curr->logicalHeight());
        IntRect rect(tx + curr->x(), ty + top, curr->logicalWidth(), bottom - top);
        if (!rect.isEmpty())
            rects.append(rect);
    }

    for (RenderObject* curr = firstChild(); curr; curr = curr->nextSibling()) {
        if (!curr->isText() && !curr->isListMarker()) {
            FloatPoint pos(tx, ty);
            // FIXME: This doesn't work correctly with transforms.
            if (curr->hasLayer())
                pos = curr->localToAbsolute();
            else if (curr->isBox())
                pos.move(toRenderBox(curr)->x(), toRenderBox(curr)->y());
           curr->addFocusRingRects(rects, pos.x(), pos.y());
<snip>

id:             chrome.dll!WebCore::RenderBlock::addFocusRingRects OOM (404d82428bd920c896c411920eae1898)
description:    Cannot allocate enough memory in chrome.dll!WebCore::RenderBlock::addFocusRingRects
application:    Chromium 11.0.671.0
stack:          chrome.dll!WebCore::RenderBlock::addFocusRingRects
                chrome.dll!WebCore::RenderBlock::addFocusRingRects
                chrome.dll!WebCore::RenderBlock::addFocusRingRects
                chrome.dll!WebCore::RenderBlock::addFocusRingRects
                chrome.dll!WebCore::RenderBlock::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderInline::addFocusRingRects
                chrome.dll!WebCore::RenderBlock::addFocusRingRects
                chrome.dll!WebCore::RenderBlock::addFocusRingRects
                chrome.dll!WebCore::RenderObject::absoluteFocusRingQuads
                chrome.dll!WebCore::AccessibilityRenderObject::boundingBoxRect
                chrome.dll!WebKit::WebAccessibilityObject::boundingBoxRect
                chrome.dll!webkit_glue::WebAccessibility::Init
                chrome.dll!webkit_glue::WebAccessibility::WebAccessibility
                chrome.dll!RenderView::SendPendingAccessibilityNotifications
                chrome.dll!MessageLoop::RunTask
                chrome.dll!MessageLoop::DoWork
                chrome.dll!base::MessagePumpDefault::Run
                chrome.dll!MessageLoop::RunInternal
                ...

[Ryosuke Niwa]

I can't reproduce this bug on r78685.  On which revision are you reproducing this bug?

[Berend-Jan Wever]

r73335 - maybe it got fixed?

[Ryosuke Niwa]

(In reply to comment #2)
> r73335 - maybe it got fixed?

I tried both r73316 and r73340 on my Mac (10.6) but opening the attachment document didn't crash / hang WebKit.  Did you reproduce it on Windows?

[Berend-Jan Wever]

Yes.

[Berend-Jan Wever]

Ryosuke: I found out that you need to start Chromium with "--force-renderer-accessibility" for this to trigger.

[Berend-Jan Wever]

*** Bug 61055 has been marked as a duplicate of this bug. ***

[Ryosuke Niwa]

(In reply to comment #5)
> Ryosuke: I found out that you need to start Chromium with "--force-renderer-accessibility" for this to trigger.

Mn... this is probably accessibility related then.  Maybe Alice would know what's happening?

[Ryosuke Niwa]

Adding more accessibility folks.

[chris fleizach]

(In reply to comment #8)
> Adding more accessibility folks.

When an accessibility element tries to calculate it's bounding rectangle, it starts calling focusRingRects.

I don't know what OOM means, but the problem likely lies in Render code, unless Chrome is not calling updateBackingStore at some point in these methods

               chrome.dll!webkit_glue::WebAccessibility::Init
                chrome.dll!webkit_glue::WebAccessibility::WebAccessibility
                chrome.dll!RenderView::SendPendingAccessibilityNotifications

to ensure that the render tree is in a valid state

[Berend-Jan Wever]

Out Of Memory (I work at Google, we have an internal app to find these things :)

[chris fleizach]

(In reply to comment #10)
> Out Of Memory (I work at Google, we have an internal app to find these things :)

On certain webpages, the focusRing method to find the bounding box is very slow. I would love to see a better implementation that is just as accurate. It's probably because it's taking either a lot of time, or as you mentioned, a lot of memory

[Ryosuke Niwa]

(In reply to comment #9)
> (In reply to comment #8)
> > Adding more accessibility folks.
> 
> When an accessibility element tries to calculate it's bounding rectangle, it starts calling focusRingRects.

What is bounding rectangle used for?  There are quite few functions that finds the rect of inline box, etc...

[chris fleizach]

(In reply to comment #12)
> (In reply to comment #9)
> > (In reply to comment #8)
> > > Adding more accessibility folks.
> > 
> > When an accessibility element tries to calculate it's bounding rectangle, it starts calling focusRingRects.
> 
> What is bounding rectangle used for?  There are quite few functions that finds the rect of inline box, etc...

Part of any accessibility API is the ability to return the onscreen rectangle of an object