[Webkit-unassigned] [Bug 62808] New: [Qt] ASSERTION FAILED in ResourceHandle::setDefersLoading causes crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=62808

           Summary: [Qt] ASSERTION FAILED in
                    ResourceHandle::setDefersLoading causes crash
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Qt
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: yi.4.shen at nokia.com


To reproduce the crash,
1) Launch QtTestBrowser
2) Load the test page (see the attachment)
3) Click the button on the page, it pops an alert bot. 
4) Close the alert box causes the crash.

The calling stack,

ASSERTION FAILED: d->m_defersLoading != defers
../../../Source/WebCore/platform/network/ResourceHandle.cpp(162) : void WebCore::ResourceHandle::setDefersLoading(bool)

Program received signal SIGSEGV, Segmentation fault.
0x01dfef2d in WebCore::ResourceHandle::setDefersLoading (this=0x837d540, defers=false) at ../../../Source/WebCore/platform/network/ResourceHandle.cpp:162
162        ASSERT(d->m_defersLoading != defers); // Deferring is not counted, so calling setDefersLoading() repeatedly is likely to be in error.
(gdb) i s
#0  0x01dfef2d in WebCore::ResourceHandle::setDefersLoading (this=0x837d540, defers=false) at ../../../Source/WebCore/platform/network/ResourceHandle.cpp:162
#1  0x01cc9233 in WebCore::ResourceLoader::setDefersLoading (this=0x837e338, defers=false) at ../../../Source/WebCore/loader/ResourceLoader.cpp:172
#2  0x01c87fab in setAllDefersLoading (loaders=..., defers=false) at ../../../Source/WebCore/loader/DocumentLoader.cpp:78
#3  0x01c8c546 in WebCore::DocumentLoader::setDefersLoading (this=0x8310308, defers=false) at ../../../Source/WebCore/loader/DocumentLoader.cpp:750
#4  0x01c99ce3 in WebCore::FrameLoader::setDefersLoading (this=0x830a280, defers=false) at ../../../Source/WebCore/loader/FrameLoader.cpp:253
#5  0x01d6dde9 in WebCore::Page::setDefersLoading (this=0x82512c8, defers=false) at ../../../Source/WebCore/page/Page.cpp:565
#6  0x01d81a74 in ~PageGroupLoadDeferrer (this=0xbfffd90c, __in_chrg=<value optimized out>) at ../../../Source/WebCore/page/PageGroupLoadDeferrer.cpp:72
#7  0x01cf3b1a in WebCore::Chrome::runJavaScriptAlert (this=0x824b670, frame=0x826eeb8, message=...) at ../../../Source/WebCore/page/Chrome.cpp:303
#8  0x01d0cd11 in WebCore::DOMWindow::alert (this=0x8245790, message=...) at ../../../Source/WebCore/page/DOMWindow.cpp:980
....

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