My app was running fine until I tried to debug it with the Application Verifier. After that I started getting "First-chance exception... : An invalid handle was specified" and the issue seems to be in the "bailout.c" file in Pantheios:
hFile = CreateFileA("logging-bailout.txt"
, GENERIC_WRITE
, 0
, NULL
, OPEN_ALWAYS
, 0
, NULL); <--- this is where it crashes, line 442
And message:
First-chance exception at 0x7769f8cd in myapp.exe: 0xC0000008: An invalid handle was specified.
=======================================
VERIFIER STOP 0000000000000300: pid 0x3814: Invalid handle exception for current stack trace.
00000000C0000008 : Exception code.
00000000111DE950 : Exception record. Use .exr to display it.
00000000111DE460 : Context record. Use .cxr to display it.
0000000000000000 : Not used.
=======================================
This verifier stop is continuable.
After debugging it use `go' to continue.
=======================================
Before the console just logged the exceptions that I got with Pantheios and I didnt really care too much about. However, now when the app crashes on the first occurrence of logging using Pantheios it's time for me to deal with this, but I'm not too sure sure how to.
I was following this guide when setting up my Pantheios: http://www.codeproject.com/Articles/27119/Using-Callback-Back-ends-with-the-Pantheios-Loggin
In every file I have logging I have the following lines in the source file:
#include <pantheios/pantheios.hpp>
#include <pantheios/inserters/boolean.hpp>
#include <pantheios/inserters/integer.hpp>
#include <Shared/logs.h>
logs.h contains:
#include <pantheios/implicit_link/core.h>
#include <pantheios/implicit_link/fe.simple.h>
#include <pantheios/implicit_link/be.WindowsConsole.h>
I also call pantheios::init(); before doing any logging.
I'm using Visual studio 2010 and are including the following lib-files under "Additional Dependencies":
$(PANTHEIOS_ROOT)\lib\pantheios.1.core.vc10.mt.debug.lib
$(PANTHEIOS_ROOT)\lib\pantheios.1.be.WindowsConsole.vc10.mt.debug.lib
$(PANTHEIOS_ROOT)\lib\pantheios.1.fe.simple.vc10.mt.debug.lib
$(PANTHEIOS_ROOT)\lib\pantheios.1.util.vc10.mt.debug.lib
However, all my logging looks like this:
First-chance exception at 0x750bb9bc in myapp.exe: Microsoft C++ exception: stlsoft::winstl_project::windows_exception at memory location 0x1822bda0..
20120423-104817.497: failed to write message to log file; given message follows: [myapp.Qt.Framework.13424, 23/04/2012 10:48:17.496 a.m.; Debug]: "some logging"
when calling pantheios::log(pantheios::debug, "some logging");
Then, all my logging is written to a "bailout"file in the same folder as the project. This worked before but it was a big bullet on my "To-do-list" (but a bit further down than other things).
So now my question is, how do I fix this? Followed every tutorial I can find but with no success. And why did my app decide to not accept this anymore after running the Ms Application Verifier? Makes no sense.
First chance exceptions mean only that an exception was thrown. It does not mean you have a bug in your program, just that the debugger is showing you that an exception is being thrown, so you have a chance to examine it before it is propagated up the call chain. If the exception is caught by an exception handler (e.g. for logging), your application continues, otherwise the debugger gives you a second-chance exception notification to inform you that the application will exit due to an unhandled exception.
If you do not want to receive the first-chance exception notifications, you can turn it off in your debugger. This link may help on how to turn off exception handling in Application Verifier.
To work around this problem, turn off exceptions testing in Application Verifier. To do this, follow these steps:
1.Start Application Verifier.
2.Under Applications, click the GDI+ program that you want to test.
3.Under Tests, expand Basics.
4.Click to clear the Exceptions check box.
5.Run the GDI+ program that you want to test.
You can also configure the debugging tool to make sure that you do not experience a breakpoint in the debugging tool when an access violation occurs.
The alternative (turning off exception notification in MSVS) is via "Debug->Exceptions..."
Alternatively, if it is possible, make sure the exception does not get thrown in the first place. You will need to examine the nature of the exception (e.g. file not found) and fix the condition that is preventing the intended operation.
Given the nature/purpose of Application Verifier, I would suggest the latter approach: AV is telling you that something incorrect is going on that might have been ok previously, but can cause problems later on (depending on enviornment, circumstances, etc.)
Related
In good old time, invalid memory access or unhandled exception in application resulted in some form messagebox displayed.
It seems to me that recently this stopped to be true. I can create a small application that does nothing else than write to NULL pointer, run it from the windows shell and it just dies silently.
I have Visual C++ commandline tools installed and using to compile that small app (plain C++ and win32 SDK). App is compiled in 64bit mode.
Any clue what is going on? I am really missing those crash messageboxes...
It's true by default this message boxes are disabled. You can do a few things about it:
1. (Re)Enable the messagebox (most probably what you are looking for)
Press Start and type gpedit.msc. Than navigate to Computer Configuration -> Administrative Templates -> Windows Components -> Windows Error Reporting -> Prevent display of the user interface for critical errors and select Disabled.
This will bring back at least some error messages if your application crashes.
2. Setup an Unhandled Exception Filter (probably dangerous)
Install an exception handler filter and filter for your desired exceptions. The drawback here is, the filter is called on every thrown exception.
3. Setup a signalhandler (also dangerous)
Basically like this.
void SignalHandler(int signal)
{
printf("Signal %d",signal);
throw "!Access Violation!";
}
int main()
{
typedef void (*SignalHandlerPointer)(int);
SignalHandlerPointer previousHandler;
previousHandler = signal(SIGSEGV , SignalHandler);
}
4. Use Windows Error Reporting
As mentioned by IInspectable and described in his answer.
Option 2 and 3 can become quite tricky and dangerous. You need some basic understanding in SEH exceptions, since different options can lead to different behavior. Also, not everything is allowed in the exception handlers, e.g: writing into files is cosidered extremly dangerous, or even printing to the terminal. Plus, since you are handling this exceptions, your program won't be terminated, means after the handler, it will jump right back to the erroneous code.
If you want your process to always show the error UI, you can call WerSetFlags with a value of WER_FAULT_REPORTING_ALWAYS_SHOW_UI. Or use any other applicable option offered by Windows Error Reporting, that suits your needs (like automatically creating a crash dump on unhandled exceptions).
A library I am using (zmq) throws an exception. The debugger breaks and informs me.
How, if possible, can I see this exception. Specifically the what() message?
Without having to place try/catch around it and printing to the output stream.
It does not appear in the Autos or Locals watch lists. I have searched the stack frames around the point at which it occured.
Adding $exception to a manual watch list simply returns a value of "identifier $exception is undefined"
Using memory explorer to interrogate the exception's location does not show anything useful.
I have read this can be done when using the CLR - can I do it in regular C++?
Referencing this answer:
You'll get a window when the exception is thrown with the option to break/continue/ignore. Copy and paste the hex address this dialog reports, then click the break button. Now in a watch window, enter something like:
(std::exception*)0xXXXXXXXX
(1) Please check that whether the Exception messages was enabled in the output window under Tools->Options->Debugging->Output window.
(2)If it still no exception messages, one possible reason is that zmq really doesn't support the Exception throw feature of VS. Of course, you could write a general app like C# or VC++ which can prove it. If other apps have no this issue, we would think about the specific zmq.
Step 1. Identify the exception (it would be logged in the output window in VS)
Step 2. Put an exception breakpoint with the exception you saw from the output.
If this is ZeroMQ, I'd wager you're Sending 2 requests on a REQ socket without waiting for a reply.
your output window
(View/Output or click CTRL + ALT + O)
is where you should see the message, but you may need to check the exceptions option:
Look here for more detail
As far as I'm aware, this isn't currently possible. I've added a User Voice suggestion here but I'm not sure when, if ever, Microsoft will implement this feature.
For now, what you can do is take the Type and Location of the exception (from the message 'Exception thrown at Address in Module: Microsoft C++ exception: Type at memory location Location.', and then add to the Watch window the expression '(Type*)Location'. If Type is some internal exception type that you don't have access to, then you can hope it derives from std::exception and cast to that instead.
This somewhat links to my previous question. Background details here: Simple HTTP request with C++
Basically I am sending data to a server through an URL with C++. I am now using openURL() function in the CInternetSession class to do it. If the openURL connects to the server successfully, no errors or exceptions are thrown. However, sometimes, in the debugger in Visual C++ 2006, I would get this pop-up
First-chance exception in myProg.exe (KERNELBASE.DLL):
0xE06D7363: Microsoft C++ Exception.
I have set the debug exceptions to "stop always" and in the debug window it shows me
Warning: throwing CInternetException for error 12029
In addition, when I run the program by itself (without the debugger and stuff), I get a pop-up saying debug error.
I understand that this is because the openURL() couldn't make a connection to the specified URL. However, my problem now is I do not want a pop-up to inform me of this. I have put a try catch block around my code but it's still not handling the exception. Here's the code
try {
// Open HTTP file
pHttpFile =(CHttpFile *) mySession.OpenURL(test1.c_str());
}
catch (CInternetException) {
printf("Received Exception from OpenURL()");
// Handle exception
}
Am I missing something here!?
Try connecting to that IP address with another method manually with 'connect'. If you can connect to it, then the openURL won't throw an exception because you already tested that you can connect to it with that other function I just mentioned.
May you also consider looking in your code to ensure that the exception is not being thrown elsewhere?
I think you should catch CInternetException* instead. For all MFC exceptions is throwed as a pointer.
PS.
You should also use CException::Delete() in your catch block to delete the exception object you just catched if you don't need to throw it again.
I've got a crash minidump to analyze. My program is multithread Qt5 application. I'm not a debugging guru but usualy I can easily find place where program failed, but this time I can't. I opened dump file in Visual Studio 2010, clicked "Debug with native only" and it shows me where problem is: it is thread with location "__CxxUnhandledExceptionFilter". Call stack is like this:
msvcr100.dll()!_abort()
msvcr100.dll()!terminate()
program.exe!__CxxUnhandledExceptionFilter(_EXCEPTION_POINTERS * pPtrs)
KERNELBASE.dll!_UnhandledExceptionFilter()
ntdll.dll!__RtlUserThreadStart()
ntdll.dll!__RtlUserThreadStart()
I expected to see stack with program functions and Qt internal functions. But this call stack tells me nothing interesting. So please tell me what is the "ExceptionFilter"-thread and how can I find place where program failed actually?
You are viewing the application at the point where the unhandled exception has already been caught by the default exception filter.
That is, you are not seeing the line where the exception occurred.
Unfortunately, this means the minidump likely contains no useful information.
You might try inspecting the _EXCEPTION_POINTERS structs, it might contain the EIP of the instruction that triggered the unhandled exception.
See the value of pPtrs->ExceptionRecord->ExceptionAddress, that should hold the EIP.
From MSDN:
ExceptionAddress: The address where the exception occurred.
To get the stack trace at the point where the exception occured, read http://support.microsoft.com/kb/313109.
I have a Windows application written in C++ that occasionally evaporates. I use the word evaporate because there is nothing left behind: no "we're sorry" message from Windows, no crash dump from the Dr. Watson facility...
On the one occasion the crash occurred under the debugger, the debugger did not break---it showed the application still running. When I manually paused execution, I found that my process no longer had any threads.
How can I capture the reason this process is terminating?
You could try using the adplus utility in the windows debugging tool package.
adplus -crash -p yourprocessid
The auto dump tool provides mini dumps for exceptions and a full dump if the application crashes.
If you are using Visual Studio 2003 or later, you should enable the debuggers "First Chance Exception" handler feature by turning on ALL the Debug Exception Break options found under the Debug Menu | Exceptions Dialog. Turn on EVERY option before starting the debug build of the process within the debugger.
By default most of these First Chance Exception handlers in the debugger are turned off, so if Windows or your code throws an exception, the debugger expects your application to handle it.
The First Chance Exception system allows debuggers to intercept EVERY possible exception thrown by the Process and/or System.
http://support.microsoft.com/kb/105675
All the other ideas posted are good.
But it also sounds like the application is calling abort() or terminate().
If you run it in the debugger set a breakpoint on both these methods and exit() just for good measure.
Here is a list of situations that will cause terminate to be called because of exceptions going wrong.
See also:
Why destructor is not called on exception?
This shows that an application will terminate() if an exceptions is not caught. So stick a catch block in main() that reports the error (to a log file) then re-throw.
int main()
{
try
{
// Do your code here.
}
catch(...)
{
// Log Error;
throw; // re-throw the error for the de-bugger.
}
}
Well, the problem is you are getting an access violation. You may want to attach with WinDBG and turn on all of the exception filters. It may still not help - my guess is you are getting memory corruption that isn't throwing an exception.
You may want to look at enabling full pageheap checking
You might also want to check out this older question about heap corruption for some ideas on tools.
The most common cause for this kind of sudden disappearance is a stack overflow, usually caused by some kind of infinite recursion (which may, of course, involve a chain of several functions calling each other).
Is that a possibility in your app?
You could check the Windows Logs in Event Viewer on Windows.
First of all I want to say that I've only a moderate experience on windows development.
After that I think this is a typical case where a log may help.
Normally debugging and logging supply orthogonal info. If your debugger is useless probably the log will help you.
This could be a call to _exit() or some Windows equivalent. Try setting a breakpoint on _exit...
Have you tried PC Lint etc and run it over your code?
Try compiling with maximum warnings
If this is a .NET app - use FX Cop.
Possible causes come to mind.
TerminateProcess()
Stack overflow exception
Exception while handling an exception
The last one in particular results in immediate failure of the application.
The stack overflow - you may get a notification of this, but unlikely.
Drop into the debugger, change all exception notifications to "stop always" rather than "stop if not handled" then do what you do to cause the program failure. The debugger will stop if you get an exception and you can decide if this is the exception you are looking for.
I spent a couple hours trying to dig into this on Visual Studio 2017 running a 64-bit application on Windows 7. I ended up having to set a breakpoint on the RtlReportSilentProcessExit function, which lives in the ntdll.dll file. Just the base function name was enough for Visual Studio to find it.
That said, after I let Visual Studio automatically download symbols for the C standard library, it also automatically stopped on the runtime exception that caused the problem.