cpp – valgrind – Invalid read of size 8

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Your program seems to have big mess and memory is getting corrupted. This is is bit difficult to find by looking out your code snippet.

However as you have mentioned in your question that you are able to attach your program using Valgrind. So you may want to attach your program(a.out).

$ valgrind –tool=memcheck –db-attach=yes ./a.out

This way Valgrind would attach your program in the debugger when your first memory error is detected so that you can do live debugging(GDB). This should be the best possible way to understand and resolve your problem.

Once you are able to figure it out your first error, fix it and rerun it and see what are other errors you are getting.This steps should be done till no error is getting reported by Valgrind.

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