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    <p>The help file for windbg goes into some more detail on the various kernel mode bug checks, and what to do about them. I don't really know your level of expertise or what you are expecting here, but generally speaking nothing you can do in a user mode program such as delphi will ever cause a bug check. Therefore we would normally go with the assumption of a driver bug, or some kind of hardware failure.</p> <p>I entered <code>UNEXPECTED_KERNEL_MODE_TRAP</code> into the help index and got this page:</p> <blockquote> <p>Windows Driver Kit: Debugging Tools Bug Check 0x7F: UNEXPECTED_KERNEL_MODE_TRAP The UNEXPECTED_KERNEL_MODE_TRAP bug check has a value of 0x0000007F. This bug check indicates that the Intel CPU generated a trap and the kernel failed to catch this trap.</p> <p>This trap could be a bound trap (a trap the kernel is not permitted to catch) or a double fault (a fault that occurred while processing an earlier fault, which always results in a system failure).</p> </blockquote> <p>elided...</p> <blockquote> <p>0x00000008, or Double Fault, indicates that an exception occurs during a call to the handler for a prior exception. Typically, the two exceptions are handled serially. However, there are several exceptions that cannot be handled serially, and in this situation the processor signals a double fault. There are two common causes of a double fault:</p> <p>A kernel stack overflow. This overflow occurs when a guard page is hit, and the kernel tries to push a trap frame. Because there is no stack left, a stack overflow results, causing the double fault. If you think this overview has occurred, use !thread to determine the stack limits, and then use kb (Display Stack Backtrace) with a large parameter (for example, kb 100) to display the full stack.</p> <p>A hardware problem.</p> <p>Cause Bug check 0x7F typically occurs after you install a faulty or mismatched hardware (especially memory) or if installed hardware fails.</p> <p>A double fault can occur when the kernel stack overflows. This overflow occurs if multiple drivers are attached to the same stack. For example, if two file system filter drivers are attached to the same stack and then the file system recurses back in, the stack overflows.</p> </blockquote> <p>elided...</p> <p>It goes on into a lot more detail about that, and the various debugging techniques and what you can do to troubleshoot the problem.</p>
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    1. POVista 64 bit BSOD when running a Delphi 2009 Application
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    1. COThanks for this, I was under the impression also that a user mode application couldn't cause a BSOD but wasn't quite sure, it seemed too much of a coincidence that it only happened exactly with Delphi 2009 at the same point in the app after multiple reboots, but the memory must have been just in the right place. I thought Vista 64 bit had address randomization. Anyway it turns out the memory on that machine is failing (tested with MS "Windows Memory Diagnostic" and MemTest86+. Thanks again.
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    2. COThe above description is not correct and also MSDN is wrong on this. What it means is that the kernel stack size was not sufficient. In addition the kernel stack is guarded by an invalid page. Therefore when you hit an invalid address on that page the processor generates a page fault, tries to push registers and gets a second page fault. This is what “double fault” means.
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