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Why the "first / second chance is unavailable" in the main dump

I use windbg to debug a crash dump, in the next exit from windbg, you can see that "first / second chance is unavailable", why is the first / second chance not available here? what does it mean?

This dump file has an exception of interest stored in it. The stored exception information can be accessed via .ecxr. (e38.2270): Access violation - code c0000005 (first/second chance not available)
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The first / second chance relates to the exceptions that can be selected, and to the debugger processing mechanism that can be used. When you debug an application using the debugger, the debugger receives exceptions before the application does this, and so you get the first chance to handle them.

A first chance exception is one that is handled by the first random debugger engine to handle exceptions.

The fact that none of them is available most likely means that there were no exceptions when this error occurred, or that the debugger did not have handlers for the first random operations to handle any thrown exception.

I would bet my bet that this error doesn’t exclude seizures because of this, it’s just a seg error.

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According to http://www.dumpanalysis.org/ (first/second chance not available) means that information about whether the exception was the first chance or the second chance is missing when the dump file failed. How to distinguish 1st and 2nd chances

Demystification of first chance exceptions (part 1 , 2 ).

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