Bug 136333 – AX: Safari at com.apple.WebCore: WebCore::AXObjectCache::clearTextMarkerNodesInUse

• Status: RESOLVED
• Resolution: FIXED
• Component: Accessibility

[chris fleizach]

(lldb) bt
* thread #1: tid = 0x12d68, 0x000000010adae22a JavaScriptCore`WTFCrash + 42 at Assertions.cpp:329, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0xbbadbeef)
  * frame #0: 0x000000010adae22a JavaScriptCore`WTFCrash + 42 at Assertions.cpp:329
    frame #1: 0x000000010eb5f586 WebCore`WebCore::Node::treeScope(this=0x00007f9e4afcded0) const + 70 at Node.h:401
    frame #2: 0x000000010eb5a603 WebCore`WebCore::Node::document(this=0x00007f9e4afcded0) const + 83 at Node.h:396
    frame #3: 0x000000010eb2ebb5 WebCore`WebCore::AXObjectCache::clearTextMarkerNodesInUse(this=0x00007f9e3bc20b30, document=0x0000000000000000) + 149 at AXObjectCache.cpp:1051
    frame #4: 0x000000010f3f2fa2 WebCore`WebCore::Frame::disconnectOwnerElement(this=0x00007f9e4b7af2f0) + 114 at Frame.cpp:814
    frame #5: 0x000000010f3f2745 WebCore`WebCore::Frame::~Frame(this=0x00007f9e4b7af2f0) + 149 at Frame.cpp:224
    frame #6: 0x000000010f3f3005 WebCore`WebCore::Frame::~Frame(this=0x00007f9e4b7af2f0) + 21 at Frame.cpp:214
    frame #7: 0x000000010f3f3029 WebCore`WebCore::Frame::~Frame(this=0x00007f9e4b7af2f0) + 25 at Frame.cpp:214
    frame #8: 0x000000010ebbd1f3 WebCore`WTF::RefCounted<WebCore::Frame>::deref(this=0x00007f9e4b7af2f8) + 83 at RefCounted.h:146
    frame #9: 0x000000010ebbd18f WebCore`WTF::Ref<WebCore::Frame>::~Ref(this=0x00007fff556c6e58) + 31 at Ref.h:41
    frame #10: 0x000000010ebb5fc5 WebCore`WTF::Ref<WebCore::Frame>::~Ref(this=0x00007fff556c6e58) + 21 at Ref.h:41
    frame #11: 0x000000010f417e1f WebCore`WTF::VectorDestructor<true, WTF::Ref<WebCore::Frame> >::destruct(begin=0x00007fff556c6e58, end=0x00007fff556c6e70) + 47 at Vector.h:56
    frame #12: 0x000000010f417ddd WebCore`WTF::VectorTypeOperations<WTF::Ref<WebCore::Frame> >::destruct(begin=0x00007fff556c6e58, end=0x00007fff556c6e70) + 29 at Vector.h:220
    frame #13: 0x000000010f417d50 WebCore`WTF::Vector<WTF::Ref<WebCore::Frame>, 16ul, WTF::CrashOnOverflow>::shrink(this=0x00007fff556c6e48, size=0) + 128 at Vector.h:957
    frame #14: 0x000000010f417cb4 WebCore`WTF::Vector<WTF::Ref<WebCore::Frame>, 16ul, WTF::CrashOnOverflow>::~Vector(this=0x00007fff556c6e48) + 52 at Vector.h:596
    frame #15: 0x000000010f416535 WebCore`WTF::Vector<WTF::Ref<WebCore::Frame>, 16ul, WTF::CrashOnOverflow>::~Vector(this=0x00007fff556c6e48) + 21 at Vector.h:594
    frame #16: 0x000000010f402055 WebCore`WebCore::FrameLoader::detachChildren(this=0x00007f9e435b0ff0) + 309 at FrameLoader.cpp:2415


<rdar://problem/17030054>

[chris fleizach]

Created attachment 237294 [details]
patch

[David Kilzer (:ddkilzer)]

Comment on attachment 237294 [details]
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=237294&action=review

r=me but please consider the comment below.

> Source/WebCore/accessibility/AXObjectCache.cpp:1051
> +        if (node->inDocument() && &(node)->document() == document)

Is there a reason to keep nodes not in a document in m_textMarkerNodes?  Just wondering if this condition should be || instead of && (and negated) since we might build up document-less nodes in the cache over time with the !document early return above:

        If (!node->inDocument() || &node->document() == document)

[chris fleizach]

Comment on attachment 237294 [details]
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=237294&action=review

>> Source/WebCore/accessibility/AXObjectCache.cpp:1051
>> +        if (node->inDocument() && &(node)->document() == document)
> 
> Is there a reason to keep nodes not in a document in m_textMarkerNodes?  Just wondering if this condition should be || instead of && (and negated) since we might build up document-less nodes in the cache over time with the !document early return above:
> 
>         If (!node->inDocument() || &node->document() == document)

I think your logic makes sense here. I'm gonna go in that direction

[chris fleizach]

http://trac.webkit.org/changeset/173067