AppVerifier breakpoint when closing VB6 application

Hello,

Another first-time user of AppVerifier and WinDbg here --

We are prepping our application for the VeriTest competency test and right
now have everything under "Basics" checked in AppVerifier. This is a VB6 app
that performs without error when run outside AppVerifier. We get no errors
when running under AppVerifier until we close the application, at which point
we get 2 Breakpoint exceptions. When run in WinDbg, we get several more
exceptions, some at the start of the app execution and some at the end. I
cannot determine at this point if this is an issue with our code or with VB6
(or something else altogether). I would like to start by showing you what
happens in WinDbg when the application opens. It appears we reach a
breakpoint even before all of the modules are loaded. Here it is:

Closing open log file c:\MyAppdevelopment\MyApp\DebugLogs\20071121_1018.log
Opened log file 'c:\MyAppdevelopment\MyApp\debuglogs\log_1103.txt'

Microsoft (R) Windows Debugger Version 6.8.0004.0 X86
Copyright (c) Microsoft Corporation. All rights reserved.

CommandLine: C:\MyAppdevelopment\MyApp\MyApp.exe
Symbol search path is:
SRV*c:\symbols*http://msdl.microsoft.com/download/symbols;symsrv*symsrv.dll*C:\symbols*http://msdl.microsoft.com/download/symbols
Executable search path is:
ModLoad: 00400000 004d5000 MyApp.exe
ModLoad: 7c900000 7c9b0000 ntdll.dll
AVRF: MyApp.exe: pid 0x1630: flags 0x80000181: application verifier enabled
ModLoad: 5ad10000 5ad56000 C:\WINDOWS\System32\verifier.dll
ModLoad: 00360000 00388000 C:\WINDOWS\System32\vrfcore.dll
ModLoad: 00390000 003c9000 C:\WINDOWS\System32\vfbasics.dll
ModLoad: 7c800000 7c8f5000 C:\WINDOWS\system32\kernel32.dll
AVRF: verifier.dll provider initialized for MyApp.exe with flags 0x80000181
ModLoad: 73420000 73574000 C:\WINDOWS\system32\MSVBVM60.DLL
ModLoad: 7e410000 7e4a0000 C:\WINDOWS\system32\USER32.dll
ModLoad: 77f10000 77f57000 C:\WINDOWS\system32\GDI32.dll
ModLoad: 77dd0000 77e6b000 C:\WINDOWS\system32\ADVAPI32.dll
ModLoad: 77e70000 77f01000 C:\WINDOWS\system32\RPCRT4.dll
ModLoad: 774e0000 7761d000 C:\WINDOWS\system32\ole32.dll
ModLoad: 77c10000 77c68000 C:\WINDOWS\system32\msvcrt.dll
ModLoad: 77120000 771ab000 C:\WINDOWS\system32\OLEAUT32.dll
(1630.1528): Break instruction exception - code 80000003 (first chance)
eax=014e6fec ebx=7ffdf000 ecx=00000001 edx=00000002 esi=014eafb0 edi=014e6fec
eip=7c901230 esp=0012fb20 ebp=0012fc94 iopl=0 nv up ei pl nz na po nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000202
ntdll!DbgBreakPoint:
7c901230 cc int 3

When I hit "g", it loads the rest of the modules. Is the above a breakpoint
coming from ntdll, or is that simply the module that reports errors? I'm
sorry if this is a dumb question, but as a VB developer, you might imagine I
am quite lost looking at all of this "inside stuff" that I thought was being
handled by the runtime.

Any insight would be most appreciated!
Thanks,
Marcia
.

Relevant Pages

  • RE: AppVerifier breakpoint when closing VB6 application
    ... You can run!avrf debugger extension and follow the troubleshooting steps ... handle checks are enabled, Appverifier keeps track of open, close and any ... I am getting 2 breakpoint exceptions from AppVerifier upon closing my ... ModLoad: 00400000 004d5000 MyApp.exe ...
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    ... it safe to assume any breakpoint associated with nt.dll is a breakpoint ... The -g command-line option causes WinDbg or CDB to ignore the initial ... now have everything under "Basics" checked in AppVerifier. ... ModLoad: 00400000 004d5000 MyApp.exe ...
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    ... I am getting 2 breakpoint exceptions from AppVerifier upon closing my ... ModLoad: 00400000 004d5000 MyApp.exe ...
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