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Corruption of the heap & F12 Problem


Corruption of the heap & F12 Problem

By : Dante Taguiwalo Jr.
Date : October 21 2020, 11:12 PM
With these it helps A little googling produced some results. It looks like F12 is reserved by the OS when you are running in the debugger. Here is a good thread about the subject. There is a workaround available from MSFT in this connect article. This gist of it is that when a debugger is active, the OS responds to F12 by entering the debugger at exactly the line of code that is currently executing.
If you are not in a debugger, then this is probably a stack corruption problem. Your code snippet looks pretty simple, but I do not know GL well enough to know if you are missing a required call or breaking some other procedural rule.
code :


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C++ Heap Corruption: Local heap variable causing issues

C++ Heap Corruption: Local heap variable causing issues


By : Prativas Basu
Date : March 29 2020, 07:55 AM
I wish this help you The code you've given looks OK - with one caveat: the initial value of counter is not in the code itself. So either you don't start at counter = 0, or some other piece of code is stomping on your indices buffer.
That's the beauty of heap corruptions. There is no guarantee that the bug is in the removed portion on the code. It may simply hide the bug that exists somewhere else in your code.
Heap corruption - "Free Heap block 61af0f0 modified at 61af194 after it was freed" C++

Heap corruption - "Free Heap block 61af0f0 modified at 61af194 after it was freed" C++


By : khan
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further
So from what I know, the error I'm getting is caused by accessing (deleting again) block of memory which was already freed.
GFlags setting to catch heap corruption (other than Page Heap)?

GFlags setting to catch heap corruption (other than Page Heap)?


By : TheColonel73
Date : March 29 2020, 07:55 AM
hop of those help? IMHO the easiest way to control all this checking is using the ApplicationVerifier. You have a perfect UI and you can play around with all flags. Heap Free checking is a good flag without too much overhead. So if a heap block is badly modified and the block is freed you get a break into the debugger. If the corruption occurs near the allocation and freeing of the block, this might help. AFAIK "Heap parameter chechking" is just a lightweight "heap validation on call". I never had any success with this. Heap tail checking and tagging is easy and fast. Works sometimes for me.
You know that you can control this on a per application base also with gflags.
HEAP CORRUPTION DETECTED: after normal block... CRT detected that the application worte to memory after end of heap buff

HEAP CORRUPTION DETECTED: after normal block... CRT detected that the application worte to memory after end of heap buff


By : FrankDu
Date : March 29 2020, 07:55 AM
will help you buffer[valread] = '\0'; is attempting to access an element of buffer that doesn't exist. The program behaviour is therefore undefined.
If you had used data.at(valread) instead then a std::exception would have been thrown (and intercepted at your catch site), as required by the C++11 standard.
I don't know why it occurs heap corruption(about memory allocation problem)

I don't know why it occurs heap corruption(about memory allocation problem)


By : user2814806
Date : March 29 2020, 07:55 AM
This might help you You forgot to write this->str_ = temp; anywhere. You just try to write the longer string into the shorter space.
code :
strcpy(this->str_,temp);
this->length_ = this->length_ + str.length_;
delete[] temp;
delete [] this->str_;
this->str_ = temp;
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