Audit Before You Merge: Provenance, Probing, and Continual LoRA Composition

Lenny Aharon, Neta Glazer, Lior Aharon

Post-hoc merging of public LoRA adapters is an attractive gradient-free path to continual adaptation, but reliable measurement of catastrophic forgetting in this setting depends on infrastructure that prior work has not addressed. We treat each adapter merge as a sequential task in a continual-learning setting, with the instruction-tuned base model's capabilities as Task 0, and study forgetting on Llama-3.1-8B-Instruct. Public adapter hubs contain modules that fail basic provenance checks: silent base-version mismatches and near-zero delta norms whose inclusion inflates measured interference by ~10pp. We propose a two-check audit (base-model match, non-trivial delta norm) and a leakage-free probing protocol as preconditions for any forgetting study in this setting. On an audited 4-adapter set, naive merging causes -10.5pp on GSM8K and -18.3pp on HumanEval, while Task Arithmetic at lambda=0.5 sits within a standard error of the unmerged baseline. A coordinate search including negative coefficients identifies the math adapter as probe-optimal at lambda=-0.5, outside the reach of positive-only mergers, suggesting forgetting has structure that negation-aware merging may exploit. The…