Debugging with GDB Manual The GNU Source-Level Debugger (769148-001, March 2014)

And if we cannot understand what bug you are trying to x, or why your patch should be an
improvement, we will not install it. A test case will help us to understand.
• A guess about what the bug is or what it depends on.
Such guesses are usually wrong. Even we cannot guess right about such things without first
using the debugger to find the facts.
278 Reporting Bugs in GDB