Yet another piece of advice for those who use Hex-Rays or Ghidra decompilers.
If you recompile pure C code you got from decompiler, you suffer from UB (undefined behaviour) often. Like if a local array hasn't been initalized, but some instruction reads from it. To detect such nasty problems, you can use Valgrind. It saved me many hours/days/weeks of debugging.
(Well, Valgrind is a cool tool for any other uses as well.)
Also, pay close attention to all C/C++ compiler warnings. This is especially important for the code on an edge of UB.
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