[Webkit-unassigned] [Bug 36894] New: Crash with frame flattening on after r56854

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=36894

           Summary: Crash with frame flattening on after r56854
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Frames
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bolsinga at apple.com
                CC: kenneth at webkit.org


Thread 0 Crashed:  Dispatch queue: com.apple.main-thread
0   com.apple.WebCore                 0x00000001011cd4c0
WebCore::Frame::ownerElement() const + 12 (Frame.cpp:1107)
1   com.apple.WebCore                 0x00000001011f6d6c
WebCore::FrameView::avoidScrollbarCreation() + 36 (FrameView.cpp:334)
2   com.apple.WebCore                 0x00000001018101c4
WebCore::ScrollView::setHasHorizontalScrollbar(bool) + 38 (ScrollView.cpp:84)
3   com.apple.WebCore                 0x00000001011f9faf
WebCore::FrameView::~FrameView() + 359 (FrameView.cpp:165)

m_frame is being destroyed here and is being accessed.

To reproduce apply the following patch, build WebKit debug and run Safari:

diff --git a/WebKit/mac/WebView/WebPreferences.mm
b/WebKit/mac/WebView/WebPreferences.mm
index 84a6e9e..28f8f17 100644
--- a/WebKit/mac/WebView/WebPreferences.mm
+++ b/WebKit/mac/WebView/WebPreferences.mm
@@ -357,7 +357,7 @@ static WebCacheModel cacheModelForMainBundle(void)
         [NSNumber numberWithBool:NO],   WebKitWebGLEnabledPreferenceKey,
         [NSNumber numberWithBool:NO],  
WebKitUsesProxiedOpenPanelPreferenceKey,
         [NSNumber numberWithUnsignedInt:4],
WebKitPluginAllowedRunTimePreferenceKey,
-        [NSNumber numberWithBool:NO],  
WebKitFrameFlatteningEnabledPreferenceKey,
+        [NSNumber numberWithBool:YES],  
WebKitFrameFlatteningEnabledPreferenceKey,
         nil];

     // This value shouldn't ever change, which is assumed in the
initialization of WebKitPDFDisplay

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