corrupted double-linked list: 0x086a6c50
tags: Issues encountered during the encoding process (qt/linux) c++ Development language qt
A new code is added, and the program is directly abnormal, but there is no problem with the new code. However, only the abnormality is displayed in Qt, and it is not caused by what is caused by an exception. After the terminal runs, it is prompted that there is a mistake. Searching the Internet is a memory problem. There are usually the following easy -to -commit memory problems:
1. Repeat the memory and release. When Double Free appears, it is usually caused by this situation (I checked my code and found that one object repeatedly released it twice, deleted one of them, and the code was OK）。
2. Memory leakage, the allocation of memory forgot to release.
3. The memory is used in the world, and the memory that should not be used, such as:
char buf[32] = {0};
for(int i=0; i<n; i++)// n < 32 or n > 32
{
buf[i] = 'x';
}
4. Using invalid pointers, usually these two situations:
1). The object has been released, but the object of the pointer refers to the pointer again.
2). A dynamic allocation object in multi -threaded is used by two threads at the same time, one thread releases the object, and the other thread continues to operate the object.
5. Air pointer, operate a empty pointer.
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