I'm in a very weird situation where my code works on my desktop but crashes on a remote cluster. I've spent countless times checking my cource code for errors, running it in debugger to catch what breaks the code, and looking for memory leaks under valgrind (which turned out to be clean -- at least under gcc).
Eventually what I have found out so far is that the same source code produces identical on both machines as long as I'm using the same compiler (gcc 4.4.5). Problem is I want to use intel compiler on the remote cluster for better performances and also some prebuilt libraries that use intel. Besides, I'm still worried that maybe gcc is neglecting some memory issues that are caught in intel compiler.
What does this mean for my code?
It probably means you are relying on undefined, unspecified or implementation-defined behavior.
Maybe you forgot to initialize a variable, or you access an array beyond its valid bounds, or you have expressions like a[i] = b[i++] in your code... the possibilities are practically infinite.