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Which is why a good reversible debugger is so powerful. (I use rr-project.org and Pernosco but I imagine undo.io is similar.) Don't worry about stopping at the right point. Go back to the critical points over and over again, and go backwards to what generated an input. If you like logs, the debugger has facilities for generating tailored ones. Or manually generate your own debugging session log trail, generating entries throughout the execution in any order, and see them in execution order.