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POHeap corruption not detected by Valgrind or Electric Fence. Should I be suspicious? (C++)
 

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  1. POHeap corruption not detected by Valgrind or Electric Fence. Should I be suspicious? (C++)
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    <p>I recently encountered my first <a href="https://stackoverflow.com/questions/5767900/struggling-yet-another-memory-corruption-problem-bad-alloc-c-vs-2008">battle</a> <strong>(solved)</strong> with heap corruption. On my linux machine at home the culprit code exits without error using valgrind and electric-fence(with gdb). Yet on the windows machine in our lab, I consistently get the heap corruption related error message from VS described in my referenced post.</p> <p>Is it surprising (or at least uncommon) that valgrind and electric fence wouldn't detect such a problem? Someone else mentioned a possibly similar bug that eluded valgrind in a answer <a href="https://stackoverflow.com/questions/7525/of-memory-management-heap-corruption-and-c">here</a>. What might be some reasons why this problem wouldn't be detected by these tools? Is there any reason to doubt that error is in fact heap corruption?</p> <p><strong>Update</strong>: As mentioned in the post describing the original problem, I found that the problem was due to having pointers to elements in a std::vector, which became bad. Replacing the vectors with std::list (to which pointers don't become invalid when adding new elements) fixed the problem. So getting back to my question about why valgrind didn't detect the problem, I ask if there are any recommendations about how to avoid a similar situation in the future, namely a memory problem that isn't detected by valgrind which is one of my favorite tools. Obviously getting a better understanding of how STL works would be a good idea. Perhaps I need to be more assertive with assert in my programming, etc. </p>
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    1. COGo back to your previous question and try gflags as the answer suggests. That is absolutely the first thing you should do on Windows when you have heap corruption: gflags /p /full /enable yourprog.exe. Then leave a comment on that answer describing your results. If it helps mark it as answered. Then come back to this question.
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      1. POHeap corruption not detected by Valgrind or Electric Fence. Should I be suspicious? (C++)
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    2. COI have been trying to use gflags as the answer suggests but haven't been able to get windbg to find the symbols for my program yet. Once I do get gflags/windbg working I may have answered my own question so I see your point. Just thought I get some thoughts on this in the meantime while I am continuing to debug.
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    3. COgflags has nothing to do with windbg. You can use gflags with the Visual Studio debugger or any other debugger.
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