[tramsdell]

[Some versions of] RtlAssert are not trapping into the debugger. It sounds like it’s a known problem: http://www.osronline.com/showThread.CFM?link=202105

I ran into this on Server `08 R2, x64. Here’s what I see when poking around and it seems consistent with Scott’s reply. The byte read has a value of 1 but is expected to be 3 – so it skips over the prompt to break into the debugger.

1: kd>

nt!RtlAssert+0x6b:

fffff800`0179917f 4c0f45cb        cmovne  r9,rbx

fffff800`01799183 33d2            xor     edx,edx

fffff800`01799185 8d4a65          lea     ecx,[rdx+65h]

fffff800`01799188 e80b58ffff      call    nt!DbgPrintEx (fffff800`0178e998)

fffff800`0179918d a0d402000080f7ffff mov   al,byte ptr [FFFFF780000002D4h]

fffff800`01799196 2403            and     al,3

fffff800`01799198 3c03            cmp     al,3

fffff800`0179919a 0f85f6000000    jne     nt!RtlAssert+0x182 (fffff800`01799296)

1: kd> db FFFFF780000002D4

fffff780`000002d4 01 03 00 00 01 00 00 00-00 00 00 00 ff ff ff ff  ................

This is a pretty fantastic tool and I would be willing to contribute to it’s advancement. You can contact me privately if you like.

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