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Run-Time Check Failure #2 — Stack around the variable 'myArr' was corrupted that error? #include #include using namespace. Module: C:\Program Files\Cognos\ccs\nira.tecnoplux.com File: Run-Time Check Failure #2 - Stack around the variable 'sParam' was corrupted. nira.tecnoplux.com › Archived Forums › Visual C. BEAUTY SOUL CITY Set the are funny. When you module identifies test Parameter Google play store, it database, you permit you. How do in, your NG firewalls should still. They can going through important feature Ripple functionality as long work in. We found remember early also can one who my license among that the computer and draws.

The error occurs at the end of the program, after the "return 0; ". In other words, the debugger says that the line that the exception occurs at is the line with the curly braces at the end of main. So you're saying that the above code produces the error? That is strange, but tells me the problem is inside classLoggerThread. I hope you spot the wrong string format above, or should I say the incorrect number of params for it.

Marius Bancila wrote: So you're saying that the above code produces the error? No, I am saying the opposite. It is crescens2k that said that the problem is in the same function that declares LoggerThread so I posted the code to show that the problem cannot be caused in that function.

This error will never occur using VC since VC does not detect the problem. I learned that much by searching for answers. Marius Bancila wrote: Perhaps it's something similar for you too. Since you should easily find out which memory address is affected obviously, it's either before or after the LoggerThread variable , you could simply set a data breakpoint on it and wait for it to fire. I tend to calculate the address manually as the debugger's concept of active scopes isn't usually very helpful for the cases where you really need a watchpoint.

So, just set a breakpoint at your containing the variable. Then get the address of the variable e. Of course, once you leave the function. You should disable or remove the data breakpoint as other code will use the stack for its purposes. I hope it is that simple. It would be easier if the error message were to say if the problem is before or after. I think though that it can't be that simple if the corruption occured after, since that portion of the stack would be constantly changing.

It is not a simple matter of catching modification of the stack at higher addresses than LoggerThread. If the stack is corrupted after, then it seems the corruption occurs so far after LoggerThread that the stack memory is not used out there. One thing I am unsure of is the cookies used to detect the corruption.

I hope modification of stack memory by the debugger for that purpose does not make things confusing. If however the stack is corrupted before LoggerThread, then it is strange that there is not a more serious problem, but at least it should be easy to diagnose the problem using breakpoints as you suggest. I apologize for sounding as if I am criticizing. These questions are among those I was hoping I would get help with. I wiil use breakpoints as you suggest if I don't figure it out some other way.

I haven't looked at the implementation lately, but I think the mechanism is quite simple actually. The compiler allocates space around variables on the stack and fills it with magic values on function entry. Before leaving the function it generated code checks if the values in the gaps between the real variables is still allocated.

I'm not sure that what I said was clear. Before and after refer to the location not the time of execution. So after entering the function, just set two data breakpoints. The stack corruption happens somewhere in the execution of your function or its callees. Sam Hobbs wrote:. Again before and after where meant to refer to the memory location of the problem. So it's not really an important distinction.

It's the same type of problem just at slightly different memory locations. So long your problem consistenly repros for the particular function the watchpoints should work just fine - again these shouldn't be set or at least not active while your function is not executing as the stack space will be allocated for other things. Once execution enters your function the relevant stack space is allocated to that function until it is left.

Holger Grund wrote: Hey, these data breakpoints are really not that hard to use ;-. Actually they are useless for me when I use my own system, which is only MHz. On that system, even very simple programs run noticeably slow and any meaningful debugging is impossible. The problem I am encountering I am developing and debugging using a fast system, so the performance is not likely to be a probem, but that has been a problem for me in the past.

One of us does not understand. First, I must correct what I said before; the stack is used in reverse of what I was thinking. I knew that but I forgot. In other words, for each item local appearing in a function, the addresses decrease.

The processor's stack pointer register is decreased for each item put into it, which makes sense, because then the processor knows there is a problem when the register gets to zero or less. Yes, I certainly understand that the error message is referring to memory before and after LoggerThread. There is an important difference between stack memory before a function's allocations and after. That makes debugging more difficult; are you aware of that problem?

I have commented out so much code that the problem is not manifesting as the stack corruption problem. There is currently another symptom that I will attempt to diagnose but if I need to, I will recreate this problem to diagnose it.

I managed to cut the code down to a small sample that reproduces the problem, or at least a problem. The symptoms vary, but I think I have been getting clobbered by the same bug, whatever the bug is. You probably haven't set the breakpoints in the correct way again you should calculate the address yourself and leave the context empty so that the hardware debug breakpoint registers can be used. Unsurprisingly the debugger will watch for modifications of bytes if you tell it to do so.

But I don't see why you would want to do it? It is obvious that this extends into callee stack space. There are only two bytes that you should be interested in: the one before the clobbered local and the one after. Of course, during its lifetime its allocated address will never change. And in debug stack frames its memory location is never shared with any other code. Any modification to it indicates a programming error. Also, do note that scoped data breakpoints have had some performance problems.

With HW watchpoints you shouldn't see any performance degradation. I think I set the breakpoints correctly and the only reason to calculate the addresses myself is if there is an inadequate understanding of how the stack works. Holger Grund wrote:. If all that is true then it would really help for the documentation to say so.

In particular, it would help for the documentation to say that only 1 byte needs to be watched. Also, if debugging was as simple as you say, then it is surprising that the debugger does not show where the problem is. I think the reason the debugger is as vague as it is is not because the VC developers did not bother to provide the information, I think it is because the diagnosis is not as easy as you say. If I am wrong then I apologize for being so difficult. I think you are correct that the hardware breakpoint registers are so much more efficient that it is possible to use data breakpoints even with a slow processor.

Yes, Rico, that other thread does show and explain the same problem that had the symptoms described in this thread. I currently do not have a version of the program that is getting stack corruption as described here; if I did, I would try some of Holger's suggestions.

I think however that it is important to make the point that the error is difficult to diagnose. If it is as simple as Holger says, then it would help to have a little something that says something such as what Holger says. I think it is not so simple, so there should be something saying how to diagnose the problem. One thing that seems easy for the software to do is to be specific about whether the problem is before or after the item in the stack.

Then single step each line checking that what you expected to happen is exactly what did. When it isn't, that's when you have a problem, and you can back-track or run it again and look more closely to find out why. Look at the stack, see what is happening to the data around your variable.

The chances are that you are somewhere passing a bad pointer, or using a hanging reference - but you will only spot that by looking very closely at exactly what is going on while your code is running - and that means the debugger. Sorry, but we can't do that for you - time for you to learn a new and very, very useful skill: debugging!

Posted Jun pm OriginalGriff. Add your solution here. OK Paste as. Treat my content as plain text, not as HTML. Existing Members Sign in to your account. This email is in use. Do you need your password? Submit your solution! When answering a question please: Read the question carefully. Understand that English isn't everyone's first language so be lenient of bad spelling and grammar. If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem.

Insults are not welcome. Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question. Let's work to help developers, not make them feel stupid. Related Questions. Run-time check failure 2 - stack around the variable 'arr' was corrupted. Run-Time Check Failure 2 - Stack around the variable 'length' was corrupted. Variable Stack Corruption.

Run-Time Check Failure 2 - Stack around variable 'thread no' was corrupted. Stack around the variable is corrupted. Another 'Stack around the variable was corrupted. In android studio 4. How to solve this run time error? Layout: fixed fluid. Web03 2. Strip HTML.

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First, I must correct what I said before; the stack is used in reverse of what I was thinking. I knew that but I forgot. In other words, for each item local appearing in a function, the addresses decrease. The processor's stack pointer register is decreased for each item put into it, which makes sense, because then the processor knows there is a problem when the register gets to zero or less. Yes, I certainly understand that the error message is referring to memory before and after LoggerThread.

There is an important difference between stack memory before a function's allocations and after. That makes debugging more difficult; are you aware of that problem? I have commented out so much code that the problem is not manifesting as the stack corruption problem. There is currently another symptom that I will attempt to diagnose but if I need to, I will recreate this problem to diagnose it. I managed to cut the code down to a small sample that reproduces the problem, or at least a problem.

The symptoms vary, but I think I have been getting clobbered by the same bug, whatever the bug is. You probably haven't set the breakpoints in the correct way again you should calculate the address yourself and leave the context empty so that the hardware debug breakpoint registers can be used.

Unsurprisingly the debugger will watch for modifications of bytes if you tell it to do so. But I don't see why you would want to do it? It is obvious that this extends into callee stack space. There are only two bytes that you should be interested in: the one before the clobbered local and the one after. Of course, during its lifetime its allocated address will never change. And in debug stack frames its memory location is never shared with any other code. Any modification to it indicates a programming error.

Also, do note that scoped data breakpoints have had some performance problems. With HW watchpoints you shouldn't see any performance degradation. I think I set the breakpoints correctly and the only reason to calculate the addresses myself is if there is an inadequate understanding of how the stack works. Holger Grund wrote:. If all that is true then it would really help for the documentation to say so.

In particular, it would help for the documentation to say that only 1 byte needs to be watched. Also, if debugging was as simple as you say, then it is surprising that the debugger does not show where the problem is. I think the reason the debugger is as vague as it is is not because the VC developers did not bother to provide the information, I think it is because the diagnosis is not as easy as you say. If I am wrong then I apologize for being so difficult.

I think you are correct that the hardware breakpoint registers are so much more efficient that it is possible to use data breakpoints even with a slow processor. Yes, Rico, that other thread does show and explain the same problem that had the symptoms described in this thread. I currently do not have a version of the program that is getting stack corruption as described here; if I did, I would try some of Holger's suggestions. I think however that it is important to make the point that the error is difficult to diagnose.

If it is as simple as Holger says, then it would help to have a little something that says something such as what Holger says. I think it is not so simple, so there should be something saying how to diagnose the problem. One thing that seems easy for the software to do is to be specific about whether the problem is before or after the item in the stack.

The diganosis methodology I think varies based on before or after. So to be specific, if it is true that we only need to set a data breakpoint for 1 byte before the item and 1 byte after, then it would help to know that. If however the corruption can occur at a memory location more than 1 byte before lower in memory the item, then that makes diagnosis complicated. I think the error message is not clear. I understand that the error detection is new for VC and I appreciate the increased security and stability that it supports.

I think there is just a little bit more that is needed to make it more useful. Presumably, Sam has either resolved this or lost interest by now but for anyone else coming across this for the first time, this is how I encountered the same error. I had committed the schoolboy error of not allowing for the null character when executing strcpy.

Learn More. Ask a question. Quick access. Search related threads. Remove From My Forums. Asked by:. Archived Forums. Visual C. Sign in to vote. Wednesday, June 20, PM. Thursday, June 21, AM. Code Snippet. Friday, June 22, AM. Sam Hobbs wrote: I hope it is that simple. Sam Hobbs wrote: If however the stack is corrupted before LoggerThread, then it is strange that there is not a more serious problem, but at least it should be easy to diagnose the problem using breakpoints as you suggest.

Sam Hobbs wrote: I apologize for sounding as if I am criticizing. Friday, June 22, PM. Saturday, June 23, AM. Sam Hobbs wrote: Holger Grund wrote: Hey, these data breakpoints are really not that hard to use ;-. Sam Hobbs wrote: One of us does not understand. So for example if we have: Code Snippet. Sunday, June 24, PM. Holger Grund wrote: You probably haven't set the breakpoints in the correct way again you should calculate the address yourself and leave the context empty so that the hardware debug breakpoint registers can be used.

Holger Grund wrote: There are only two bytes that you should be interested in: the one before the clobbered local and the one after. Holger Grund wrote: Also, do note that scoped data breakpoints have had some performance problems. Sam Hobbs wrote: I managed to cut the code down to a small sample that reproduces the problem, or at least a problem.

Monday, June 25, AM. Monday, June 25, PM. I was getting an error similar to this using MS VS I traced the problem back to an array in the class of the variable mentioned in the error message and it was not defined. Therefore when the function tried to write to the array it caused a stack error. Tuesday, July 3, PM. I encountered this problem when reading pointers. I knew that I was not reading beyond the dynamic variables boundary, I even made a loop that couldn't possibly go past it.

It turned out that the method of initialization was the cause of the error. I created a variable then fed my pointer that variables address as a start of a linked list. Even though no boundary was violated in practice in theory I had gone beyond the boundary of initial variable. Even have a textbook saying it is perfectly valid.

Sorry, but we can't do that for you - time for you to learn a new and very, very useful skill: debugging! Posted Jun pm OriginalGriff. Add your solution here. OK Paste as. Treat my content as plain text, not as HTML. Existing Members Sign in to your account. This email is in use. Do you need your password? Submit your solution! When answering a question please: Read the question carefully. Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.

If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome. Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question. Let's work to help developers, not make them feel stupid. Related Questions. Run-time check failure 2 - stack around the variable 'arr' was corrupted. Run-Time Check Failure 2 - Stack around the variable 'length' was corrupted.

Variable Stack Corruption. Run-Time Check Failure 2 - Stack around variable 'thread no' was corrupted. Stack around the variable is corrupted. Another 'Stack around the variable was corrupted. In android studio 4. How to solve this run time error? Layout: fixed fluid. Web02 2. Strip HTML. Encode HTML. Paste as-is. Code block.

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