Forum posts for ntkrnlpa.exe

IE hanging with 100% CPU / Got stack trace

I have a situation where IE7 hangs accessing my web app. Based on the excellent suggestion from George V. Reilly, I installed WinDbg to download the IE symbols, setup Process Explorer to use those symbols, and then used Process Explorer to get a stack trace for the hung thread.

I have pasted the stack trace below. Does someone more familiar with the IE internals have an idea of what is happening, or a suggestion on how to progress with this?

ntkrnlpa.exe!KiUnexpectedInterrupt+0x8d
ntkrnlpa.exe!PsDereferencePrimaryToken+0x362
ntkrnlpa.exe!KiDeliverApc+0xb3
ntkrnlpa.exe!KiDispatchInterrupt+0x5a2
ntkrnlpa.exe!SeOpenObjectAuditAlarm+0x1ce
mshtml.dll!CTreePos::GetCp+0x5a
mshtml.dll!CFlowLayout::GetNestedElementCch+0x7d
mshtml.dll!CDisplay::FormattingNodeForLine+0x1d5
mshtml.dll!CFlowLayout::LineStart+0xdb
mshtml.dll!CDisplayPointer::GetLineStart+0x44
mshtml.dll!CDisplayPointer::IsAtBOL+0x4e
mshtmled.dll!CCaretTracker::PositionCaretAt+0xf9
mshtmled.dll!CCaretTracker::Init2+0x54
mshtmled.dll!CSelectionManager::SetCurrentTracker+0x26
mshtmled.dll!CSelectionManager::CreateTrackerForContext+0x1c0
mshtmled.dll!CSelectionManager::SetEditContext+0x8b
mshtmled.dll!CSelectionManager::SetEditContextFromElement+0x2ed
mshtmled.dll!CSelectionManager::EnsureEditContextClick+0x343
mshtmled.dll!CSelectionManager::HandleEvent+0xb9
mshtmled.dll!CHTMLEditor::PostHandleEvent+0x89
mshtml.dll!CDoc::HandleSelectionMessage+0x1e0
mshtml.dll!CDoc::PumpMessage+0xb69
mshtml.dll!CDoc::OnMouseMessage+0x3d7
mshtml.dll!CDoc::OnWindowMessage+0x748
mshtml.dll!CServer::WndProc+0x78
USER32.dll!InternalCallWinProc+0x28
USER32.dll!UserCallWinProcCheckWow+0x150
USER32.dll!CallWindowProcAorW+0x98
USER32.dll!CallWindowProcW+0x1b
IEDevToolbar.dll!DllUnregisterServer+0xe21d
USER32.dll!InternalCallWinProc+0x28
USER32.dll!UserCallWinProcCheckWow+0x150
USER32.dll!DispatchMessageWorker+0x306
USER32.dll!DispatchMessageW+0xf
IEFRAME.dll!CTabWindow::_TabWindowThreadProc+0x189
kernel32.dll!BaseThreadStart+0x37

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